AEM AA21-400 Maintenance Manual

Airborne Technology (NAT)/Cobham Aerospace Communications (CAC). AEM is responsible for all matters related to this product, including sales, support and repair services. Please note the transition to convert product manuals and supporting documentation is an ongoing process and is being addressed on an ‘as needed’ basis. All references to NAT product part numbers (and associated images) are equivalent to AEM product part numbers. Contact info: Anodyne Electronics Manufacturing Corp. #15-1925 Kirschner Road Kelowna B.C. Canada V1Y 4N7 Email: [email protected] Toll Free: 1-888-763-1088 Phone: 1-250-763-1088 Fax: 1-250-763-1089 www.aem-corp.com

MAINTENANCE MANUAL REV 5.00 November 9, 2016 Anodyne Electronics Manufacturing Corp. 15-1925 Kirschner Road Kelowna, BC, Canada. V1Y 4N7 Telephone (250) 763-1088 Facsimile (250) 763-1089 Website: www.aem-corp.com © 2016 Anodyne Electronics Manufacturing Corp. (AEM), All Rights Reserved SM34 AA21-400 Cabin PA System

SM34 Maintenance Manual Maintenance Manual Page ii ENG-FORM: 823-0101.DOTX CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. COPYRIGHT STATEMENT © 2016 Anodyne Electronics Manufacturing Corp. (AEM), All Rights Reserved This publication is the property of AEM and is protected by Canadian copyright laws. No part of this document may be reproduced or transmitted in any form or by any means including electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of AEM.

SM34 Maintenance Manual Maintenance Manual Page iii ENG-FORM: 823-0101.DOTX CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. Prepared By: Checked By: Approved By: The status of this Maintenance Manual is controlled by the revision shown on the title page. The status of each section is controlled by revision shown in the footer of each page. All revisions affecting sections of this manual have been incorporated. AEM MANUAL REVISIONS Revision Number Revision Description Date Rev: 5.00 ECO1054: AEM Rebranding Nov 9, 2016 Tony Pearson Designer Dec 7, 2016 Loen Clement Designer Dec 07, 2016 Tom Betzelt Product Support Manager Dec 7, 2016 Todd Blackstock R&D Manager Dec 9/16

SM34 Maintenance Manual Maintenance Manual Page iv ENG-FORM: 823-0101.DOTX CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. Table of Contents Section Title Page 4.0 Theory 4.1 Introduction 4-1 4.2 Overview 4-1 4.2.1 Main Subassembly 4-1 4.2.2 Control Interface Subassembly 4-1 4.2.3 Backlighting Subassembly 4-1 4.3 Theory of Operation 4-2 4.3.1 Power Supply 4-2 4.3.2 Mic Input 4-2 4.3.3 Receive/CD Inputs 4-3 4.3.4 Sirens 4-3 4.3.5 Sidetone Output 4-4 4.3.6 Output Selection & Volume Control 4-4 4.3.7 External PA Output 4-5 4.3.8 Speaker Output 4-5 4.3.9 Temperature Sensor 4-5 4.3.10 +3dB Input 4-6 4.3.11 Backlighting 4-6 5.0 Maintenance 5.1 Introduction 5-1 5.2 Continued Airworthiness 5-1 5.3 Disassembly/Reassembly 5-1 5.3.1 Disassembly 5-1 5.3.2 Reassembly 5-2 5.4 Test Equipment 5-3 5.4.1 Test Cables 5-3 5.4.2 Test Jigs 5-3 5.5 Test and Alignment Procedures 5-3 6.0 Documentation and Drawings 6.1 Introduction 6-1 6.2 Documentation and Drawings 6-1 6.2.1 Product 6-1 6.2.2 Subassembly 6-1 7.0 Bulletins 7.1 Introduction 7-1 7.2 Bulletin Listing 7-1

SM34 Maintenance Manual Maintenance Manual Page v ENG-FORM: 823-0101.DOTX CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. 8.0 Supplements 8.1 Introduction 8-1 8.2 Supplement Listing 8-1

SM34 Maintenance Manual Build Standard: 5.00 Nov 09, 2016 Page 4-1 ENG-FORM: 842-0100.DOTX CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. Section 4.0 Theory 4.1 Introduction Information in this section consists of a detailed discussion of the theory of operation, providing the technician with the information necessary to perform in depth troubleshooting. See Section 6 for all referenced drawings. 4.2 Overview The AA21-400 Cabin PA control unit is designed to provide centralized control for an aircraft’s internal and external PA systems in one panel-mounted unit with an illuminated faceplate. All audio and keylines are interfaced to existing aircraft audio systems. Front panel switches provide selection of the various operational modes of the AA21 and a potentiometer provides output volume control. The AA21-400 design is composed of three subassemblies: the main subassembly, the control interface subassembly and the backlighting subassembly. 4.2.1 Main Subassembly The main subassembly contains circuits that include the power supply, input amplifiers, output amplifiers, keyline input interfaces, siren audio generation, temperature monitor, and speaker output short circuit protection. Components with 100- or 200-series numbers are located on this subassembly. Individual functions of the main subassembly will be described in greater detail in the sections to follow. 4.2.2 Control Interface Subassembly The control interface subassembly contains the unit’s main power switch, three mode selection switches, main output volume control and a power status indicator. This subassembly interfaces to the main subassembly with a 26-pin ribbon cable. Components with 400-series numbers are located on this subassembly. The functions of this subassembly will be described in greater detail in the sections to follow. 4.2.3 Backlighting Subassembly The backlighting subassembly provides the lighting components required to illuminate the text legends on the front panel faceplate. This subassembly interfaces to the control interface subassembly with a two-pin header connector. Components with 500-series numbers are located on this subassembly. The functions of this subassembly will be described in greater detail in a following section.

SM34 Maintenance Manual Build Standard: 5.00 Nov 09, 2016 Page 4-2 ENG-FORM: 842-0100.DOTX CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. 4.3 Theory of Operation Refer to diagrams AA21-1A\401-0, AA21-4\401-0 and AA21-5\401-0 4.3.1 Power Supply Positive 28 Vdc power is supplied to the AA21 through connector J101 pins 1 and 2, and power ground is through connector J101 pins 14 and 15. Positive power is over-current protected by fuse F101. Power is then noise filtered through T-network filter FL102 and choke L101. After filtering, the power is routed to connector J102 pins 1, 2 and 25. Ribbon cable W1 transfers the power to connector J401 pins 1, 2 and 25. Power is then switched on or off through front panel POWER switch S401. Power status indication is provided by the circuit of resistor R402, LED DS401 and diode D401. LED DS401 illuminates green when +28 Vdc power is applied to the AA21 and switch S401 is set to ON. Once switched on, the power is routed to connector J401 pins 3, 4 and 26 and to connector J102 pins 3, 4 and 26 through ribbon cable W1. The power is then reverse-voltage protected through diode D129 and over-voltage protected by zener diode D130. After D129/D130 the 28 Vdc power is fed in three general directions: output from the AA21, power to several circuits on the main subassembly and power to further stages of the power supply. The 28 Vdc output is over-current protected through fuse F102 and routed to connector J101 pin 8, labeled SWITCHED POWER. The 28 Vdc power is directly supplied to three opto-isolators (U116, U118, and U119), three solid-state relays (U103, U104, and U105) and the speaker output amplifier stage. Finally, the 28 Vdc power is supplied to the remainder of the power supply described in the following paragraph. Capacitors C158 through C161 provide filtering and charge retention for the 28 Vdc power. Resistor R205, zener diodes D131, D132, capacitors C162, C163 and transistor Q106 form a circuit that provides series pass regulation, and reduces the power to 22 Vdc for supply to the external speaker output amplifier. This power is then regulated to 12 Vdc by the circuit containing U120 and D133, and routed to the siren generator circuit, temperature sensor, and various amplifiers. The 12 Vdc is then fed into the 8 Vdc regulator circuit, which includes U121 and D134, and the 8 Vdc output is used to provide mic bias and as a muting input to the receive amplifier through U118. The 8 Vdc output is then fed into the input of the 5 Vdc regulator circuit, which includes U124 and D135, to provide 5 Vdc output as a power input for mic amplifier U106, and as a pull up for transistor Q103. Capacitors C164 through C168 and C177 provide noise filtering and charge retention along the DC path of the power supply. 4.3.2 Mic Input The mic signal is delivered to the AA21 from connector J101 pins 13 and 25. DC mic bias is supplied to pin 13, MIC HI, by a circuit comprised of R116, R117 and C103. The mic signal is then coupled through C102 and transformer T101. The mic is low pass filtered by R119, C106 and AC coupled to mic pre-amplifier U106. The mic pre-amplifier has an integrated AGC control to ensure a consistent output level after the maximum input level is exceeded. The mic pre-amplifier U106 levels off the mic input signal after 130 mVrms. The mic signal is then low-pass filtered by R121, C178. This signal is then fed to two voltage-controlled amplifiers: the sidetone output driver U108 and the mic gain amplifier U107. The sidetone amplifier gain is controlled by the S/T LEVEL trimpot R159. The gain of the mic gain amplifier is controlled by the MIC LEVEL trimpot R126. The gain of the mic pre-amplifier is low- temperature compensated by thermistor RT101 in series with the mic level trimpot, and thermistor RT102 in series with the sidetone level trimpot.

SM34 Maintenance Manual Build Standard: 5.00 Nov 09, 2016 Page 4-3 ENG-FORM: 842-0100.DOTX CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. After the mic gain amplifier, the mic signal is fed to solid state relay U103 where the signal may be selected or de-selected. Depending on selection mode, the mic signal is either fed to external speaker driver U109 or to speaker driver U110 and U113. The sidetone amplifier U108 is enabled when an active low PA KEY is applied to the AA21. To enable the mic gain amplifier, PA must be selected on the front panel of the AA21, and an active low PA KEY must be applied to the AA21. The PA KEY signal causes a solid state relay U118 to apply +8 Vdc to the cathodes of D119 and D120, thus reverse-biasing the diodes. This activates the voltage-controlled inputs of mic amp U107 and sidetone amp U108 based on their respective potentiometer level settings. When the PA is selected on the front panel, a ground is applied on PA/RX switch S403 pins 1 and 4. These grounds are present on J401 pins 10 and 24 and are routed to J102 pins 10 and 24 by cable W1. When J401 pin 10 (PA) is active (grounded), it turns off Q103 and activates the voltage control of the mic amplifier U107. When J401 pin 24 (RECEIVE DISABLE) is active (grounded), it disables the receive amplifier and allows for mic signal only to be routed to the selected output stage. 4.3.3 Receive/CD Inputs The receive/CD inputs only allow either receive or CD to be active at one time. This selection is achieved by setting jumper JP105. By installing a shorting block on pins 1 and 2 of JP105, the receive input is enabled. Receive audio high to the AA21 is available on J101 pin 11, and low is on pin 23. The circuit containing components R161, C109 and R167 sets the input impedance and pass band for the receive audio input. By installing a shorting block on pins 2 and 3 of JP105 the CD input is enabled. CD audio high input to the AA21 is available on J101 pin 12 and low on pin 24. The circuit containing components R162, C110 and R163 set the input impedance and pass band for the CD audio input. The audio signal is then fed to a voltage controlled amplifier U114. The gain of this amplifier is controlled by RECEIVE LEVEL trimpot R173. Capacitor C129 ensures smooth audio gain transitions when the receive amplifier is enabled/disabled. The receive/CD output is enabled by selecting RADIO on the AA21 front panel. This selection applies a ground to S403 pin 3, J401 pin 9 and J102 pin 9 (RADIO). The active (grounded) RADIO turns off Q104 and allows the voltage controlled input of receive amplifier U114 to be controlled by the RECEIVE LEVEL potentiometer setting. This same selection action removes the ground from the PA control line and turns transistor Q103 on. When Q103 turns on, a ground is applied to the voltage control of mic amplifier U107, thus disabling the mic amplifier when RADIO is selected. After the receive amplifier, the audio signal is fed to the selected output. 4.3.4 Sirens Siren mode selection is set using front panel switch S404 and has three settings: WAIL, OFF and YELP. The wail and yelp sirens possess the same tone range but the yelp siren has a higher frequency sweep rate than the wail siren. Both sirens are disabled when front panel switch S404 is set to the OFF position. When the wail siren is selected, S404 pin 1, JP401 pins 1 and 2, and J401 pin 21 are all grounded. By the same selection, the second pole of S404 applies a ground on S404 pin 4, JP402 pins 1, 2, and J401 pin 18. The ground at J401 pin 18 is routed to J102 pin 18 through cable W1. This ground enables sweep rate adjustment through WAIL potentiometer R221. The wail siren also requires YELP/WAIL KEY to be active (grounded) in order for the siren to be heard. This will be described later in this section. When the yelp siren is selected, S404 pin 3, JP401 pins 5 and 6, and J401 pin 20 are all grounded. By the same selection, the second pole of S404 applies a ground on S404 pin 6, JP402 pins 5 and 6, and J401 pin 19. The ground at J401 pin 18 is routed to J102 pin 19 through cable W1. This ground enables sweep

SM34 Maintenance Manual Build Standard: 5.00 Nov 09, 2016 Page 4-4 ENG-FORM: 842-0100.DOTX CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. rate adjustment through YELP potentiometer R222. The yelp siren also requires YELP/WAIL KEY to be active (grounded) in order for the siren to be heard. This will be described later in this section. The rate at which the siren tone sweeps is determined by the respective siren adjustment potentiometers as well as the circuit associated with U123. The start and stop frequencies are determined by resistors R217, R218, R219 and capacitor C174. The rate at which the siren tone sweeps between the start and stop frequencies are determined by either R221 or R222. The ramp waveform output of U122 is present on pin 2 and is then attenuated by the resistor network of R213, R214, R215 and R216. The circuit centered around U122 provides the sinusoidal tone output to the siren amplifier. The frequency of tone output from U122 pin 2 is dependent on the swept ramp waveform provided by U123. The waveform symmetry of the sinusoidal output is maintained by resistor R207. The output from U122 pin 2 is then attenuated by resistors R208, R174 and R175. The siren audio is then AC coupled to siren amplifier U115 by capacitors C130 and C131. Either the WAIL ON or YELP ON from J401 pins 21 and 20 is grounded when WAIL or YELP is selected. These signals are routed to J102 pins 21 and 20. The WAIL ON and YELP ON are combined on the main subassembly. This signal named YELP/WAIL KEY is connected to U119 pin 6. When the SIREN KEY on J101 pin 18 is activated (grounded) U119 is switched on and output pins 4 and 6 of the solid state relay are connected. When grounds are present at SIREN KEY and YELP/WAIL KEY the base of transistor Q105 is reverse biased thus turning Q105 off. This allows the voltage control (pin 4) of siren amplifier U115 to amplify the siren audio at the level set by SIREN LEVEL potentiometer R179. A siren audio is only present when the siren select switch on the front panel is set in WAIL or YELP mode, the SIREN KEY is active, and the SIREN LEVEL potentiometer is set appropriately. The WAIL or YELP sweep rates are adjustable when sirens are active by setting R221 or R222 respectively. Siren audio is routed only to the EXT PA output and requires the front panel output selector switch S402 be set to EXT. Sirens will never be present on the INT output (internal speaker). The siren audio is present for both settings PA or RADIO on front panel input selection switch S403. 4.3.5 Sidetone Output Sidetone audio is derived directly from the mic pre-amplifier output. The sidetone audio output is coupled from the sidetone amplifier U108 to connector J101 by transformer T102. Sidetone audio output is a differential output with the high side available on J101 pin 9 and the low side on J101 pin 21. The sidetone output level is only adjustable by setting SIDETONE LEVEL potentiometer R159. 4.3.6 Output Selection & Volume Control Selection of front panel switch S402 to INT applies a ground on S402 pin 3 and J401 pin 7. The internal speaker selection signal is routed to J102 pin 7 and the cathode of D106. Diode D106 acts as protection for U103 and U105 pin 4. The approximate ground level that is present on U103 pin 4 energizes the solid state relay thus shorting pins 5 and 6 of U103 and opening pins 7 and 8. Resistor R113 provides current limiting for the internal LED’s of U103. Now the mic or receive/CD audio present at pin 5 of U103 is switched to pin 6 and 7 of U103 and connected to J102 pin 17 (POT HI). This audio signal is routed to J401 pin 17 and front panel VOLUME potentiometer pin 3. Volume potentiometer R401 attenuates the audio and outputs this level adjusted output on pin 2. The audio on R401 pin 2 is connected to J401 pin 16 and routed to J102 pin 16 (POT WIPER) through cable W1. The pot wiper signal is present at pin 5 of U104 through pins 2 & 3 of JP101. This same signal is present at pin 5 of U105 through pins 2 & 3 of JP102. When INT speaker is selected, the EXT speaker amplifier input is muted by a ground supplied by U104 pin 8 connected to U104 pins 6 & 7. Solid state relay U105 is energized by an approximate ground at input pin 4, which connects, pins 5 & 6 and opens pin 7 & 8. Resistor R115 provides current limiting for the internal LED’s of U105. The audio present at U105 pin 5 is then connected to pins 6 & 7 and routed to the internal speaker amplifier.

SM34 Maintenance Manual Build Standard: 5.00 Nov 09, 2016 Page 4-5 ENG-FORM: 842-0100.DOTX CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. Selection of front panel switch S402 to EXT applies a ground on S402 pin 1 and J401 pin 8. The external speaker selection signal is routed to J102 pin 8 and the cathode of D105. Diode D105 acts as protection for U104 pin 4. The approximate ground level that is present on U104 pin 4 energizes the solid state relay thus shorting pins 5 and 6 of U104 and opening pins 7 and 8. Resistor R114 provides current limiting for the internal LED’s of U104. The audio present at pin 5 of U104 is then routed to the external speaker amplifier. At the same time, relay U105 is de-energized and the internal speaker amplifier input is grounded by U105 pins 6 & 7 connected to pin 8. The ground on U105 pins 6 & 7 is routed to the input of internal speaker amplifier thus muting the amplifier. Either the internal speaker or the external speaker output may be enabled, but not both. 4.3.7 External PA Output Selected external speaker audio is adjustable by EXT SPKR LEVEL potentiometer R127. The setting on R127 is dependent on the VOL control R401 in determining the final output level. If jumper J104 is not installed, a high level of output is provided from the external speaker amplifier that is compatible with the inputs for PA110/220 series of power amplifiers. When jumper J104 is installed, the output level from the external speaker amplifier is compatible with the inputs for PA250/700 series of power amplifiers. The circuit centered around IC U109 provides band pass filtering and power amplification to the audio present at R127 pin 2. The ratio of resistors R135 to R136 set the gain of power amplifier U109. Capacitor C122 and resistor R137 set the output impedance for U109. Diodes D107 and D108 provide protection for overvoltage conditions that may arise. Capacitor C123 AC couples the amplified audio from U109 pin 4 and FL101 provides high frequency noise filtering. The audio is then coupled to connector J101 pins 6 and 19 by transformer T103. Selected audio available on the external speaker output includes mic audio, receive/CD audio or siren audio. 4.3.8 Speaker Output Selected internal speaker audio is adjustable by INT SPKR LEVEL potentiometer R138. The setting on R138 is dependent on the VOL control R401 in determining the final output level. The internal speaker audio is then band pass filtered before it is fed to the input of speaker A amplifier U110. The speaker output is a balanced push-pull configuration. The output of the speaker A amplifier U110 is sampled through R149 and C140 and fed into the inverting input of the speaker B amplifier U113. The speaker outputs are protected against excessive loading by an over current protection circuit. Each side of the push-pull output is sampled through two transformers T104 and T105, amplified by U112A and U112B, rectified by D125 and D128 and then compared, by U111A and U111B, to a set DC reference voltage. The reference voltages are set by resistive dividers R156, R157 and R201, R202. If the rectified voltage exceeds the reference voltage the comparator outputs a ground, temporarily muting the mic amplifier U107, sidetone amplifier U108, receive amplifier U114 and siren amplifier U115. Diodes D111 through D114 provide the path to ground from the amplifier voltage control pins. When the signals are muted the rectified voltage will decrease, dropping below the reference voltage. The output of the comparator will go open, enabling the four previously muted amplifiers to preset gain levels. The output will toggle between these two states as long as the overload condition exists. 4.3.9 Temperature Sensor The AA21 has an internal ambient temperature sensor IC U117. When the monitored temperature exceeds approximately 129 Celsius, the temperature sensor IC partially mutes the mic amplifier U107, receive amplifier U114 and siren amplifier U115 by approximately 3dB. The temperature trip point is set by the resistor network containing resistor R165 and R166. The mic amplifier is muted through resistor R160 and diode D118. The receive amplifier is muted through resistor R171 and diode D117. The siren amplifier is muted through resistor R180 and diode D115. When the ambient temperature drops below this threshold, the previously muted amplifiers are then enabled at set levels.

SM34 Maintenance Manual Build Standard: 5.00 Nov 09, 2016 Page 4-6 ENG-FORM: 842-0100.DOTX CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. 4.3.10 +3dB Input The AA21 has an external active low input for affecting the gain of the mic amplifier U107, receive amplifier U114 and siren amplifier U115. Grounding the +3dB input energizes solid state relay U116 by allowing current to flow in diode D121 and resistor R164. This allows U116 pin 4 to connect to pin 6 and output a ground. This ground will reduce the gain of these three amplifiers by 3dB. 4.3.11 Backlighting Backlighting power is applied to the AA21 on connector J101 pins 3 and 16. Pin 3 is the positive backlighting power (+28 V LIGHTS) and pin 16 is the backlighting common (LIGHTS GROUND). These signals are routed to connector J102 pins 6 and 5 respectively. Cable W1 routes these signals to J401 pins 6 and 5. These signals are then routed to connector J402 pins 1 and 2 on the Control Interface subassembly. The 28 V LIGHTS signal is named LIGHTS HI on J402 pin 1 and the LIGHTS GROUND path is named LIGHTS LO on J402 pin 2. Backlighting subassembly connector J501 mates directly to Control Interface subassembly connector J402. Backlighting power is supplied to the Backlighting subassembly by connector J501 pins 1 and 2. Lamps DS501 through DS506 are connected in parallel across the backlighting power and illuminate when supplied with the correct voltage. End of Section 4.0

SM34 Maintenance Manual Build Standard: 5.00 Nov 09, 2016 Page 5-1 ENG-FORM: 852-0100.DOTX CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. Section 5.0 Maintenance 5.1 Introduction This section includes the AA21-400 assembly/disassembly instructions, troubleshooting and the unit test procedure. See section 6 for all referenced drawings. The AA21-400 contains electrostatic discharge sensitive components. All assembly/disassembly and maintenance procedures should be performed at a static protected workstation. 5.2 Continued Airworthiness The Airworthiness Limitations section is FAA approved and specifies inspections and other maintenance required under 14 CFR §§ 43.16 and 91.403, unless an alternative program has been FAA approved. Maintenance of the AA21-400 is ‘on condition’ only. Periodic maintenance of this product is not required. 5.3 Disassembly/Reassembly Refer to Exploded View drawings AA21\400\904-0, AA21-1A\904-0, AA21-4\904-0 and AA21-5\904-0. 5.3.1 Disassembly Note: Some of the screws are secured with Loctite; an initial sharp twist is necessary to break the bond. 5.3.1.1 Using an Allen key, release and remove VOL knob M6 from the shaft of Control Interface subassembly SA2. 5.3.1.2 Release faceplate M3 from cover M2 and Control Interface subassembly SA2 by unfastening four black panhead screws M10. Orient all switches upwards, and remove faceplate by gently prying it away from the unit. 5.3.1.3 Remove Backlighting subassembly SA3 by disconnecting connector J501 from Control Interface subassembly SA2 connector J402. 5.3.1.4 Remove cover M2 from Main subassembly SA1 by unfastening six flathead screws M9 from the top of the unit. 5.3.1.5 Disconnect cable assembly W1 from Main subassembly SA1 connector J102. 5.3.1.6 Disconnect the other end of cable assembly W1 from Control Interface subassembly SA2 connector J401. 5.3.1.7 Release chassis M1 from Main subassembly SA1 by unfastening four panhead screws M8 at the rear of the unit (two from the heatsinks, and two from locking hardware M7), two panhead

SM34 Maintenance Manual Build Standard: 5.00 Nov 09, 2016 Page 5-2 ENG-FORM: 852-0100.DOTX CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. screws M8 and washers M11 (from the circuit board), and eight flathead screws M9 (six from the bottom of the unit, and two from the front). 5.3.1.8 Remove Main subassembly SA1 circuit board from chassis M1 by lifting the rear of the board first, and sliding it back until it clears Control Interface subassembly SA2. 5.3.1.9 Using a nut driver or wrench, unfasten the nuts from switches S401 - S404 and potentiometer R401 of Control Interface subassembly SA2. Note: It may be necessary to unscrew and remove the three metal switch caps M13 if a nut driver is to be used. 5.3.1.10 Remove Control Interface subassembly SA2 from chassis M1. 5.3.2 Reassembly 5.3.2.1 Place Control Interface subassembly SA2 into Chassis M1. 5.3.2.2 Secure Control Interface subassembly SA2 to Chassis M1 by installing nuts removed in step 5.3.1.9 to switches S401 - S404 and potentiometer R401. 5.3.2.3 Install Main subassembly SA1 into Chassis M1 and fasten with eight screws M9. Fasten Main subassembly SA1 to chassis M1 with two screws M8 and two lock washers M11. Use Loctite 222 on the two screws M9 that fasten Main subassembly SA1 heatsinks to from of chassis M1. 5.3.2.4 Connect on end of Cable assembly W1 to the Control Interface subassembly SA2 connector J401 and the other end to the Main subassembly SA1connector J102. 5.3.2.5 Install cover M2 and Main subassembly SA1 and fasten using sic screws M9. 5.3.2.6 Mate Backlighting subassembly SA3 connector J501 to Control Interface subassembly SA2 connector J402. 5.3.2.7 Fasten Faceplate M3 to Cover M2 and Control Interface subassembly SA2 with four screws M10. 5.3.2.8 Fasten Main subassembly SA1 connector J101 to Chassis M1 with locking hardware M7 and two screws M8. Use Loctite 222 on the screw threads. 5.3.2.9 Fasten Main subassembly SA1 heatsinks to Chassis M1 with tow screws M8. 5.3.2.10 Set the shaft of Control Interface subassembly SA2 R401 (VOL) fully ccw. Fasten knob M6 onto the shaft with the knob pointer orientated to the 7 o’clock position.

SM34 Maintenance Manual Build Standard: 5.00 Nov 09, 2016 Page 5-3 ENG-FORM: 852-0100.DOTX CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. 5.4 Test Equipment The equipment necessary for testing this unit is specified in the Test Equipment section of the appropriate Test Procedure (see section 5.5 below). 5.4.1 Test Cables The appropriate cable for testing this unit can be fabricated using the Schematic (TC21-400\401-0) and Parts List (TC21-400\701-0) listed below, which can be found at the end of this section. 5.4.2 Test Jigs 5.4.2.1 TJ-252 Resistor Load Box The TJ-252 Resistor Load Box can be fabricated using Test/Assembly Jig Drawing (TJ\252\954-0 and -1) listed in section 5.5 below, which can be found at the end of this section. 5.4.2.2 Subassembly Test Jigs The appropriate test jigs for use with the subassembly Alignment Procedures can be purchased from AEM. 5.5 Test and Alignment Procedures For all maintenance procedures, refer to the following documents found at the end of this section. Note: If a document refers to ‘the applicable Build Standard’, select the appropriate drawing for the serial number of the unit under consideration. DOCUMENT REV. DESCRIPTION TYPE SERIAL # AA21-400-518-0 1.32 Cabin PA System Acceptance Test Report All AA21-400-614-0 1.31 Cabin PA System Acceptance Test Procedure All AA21-1A-628-0 1.20 Main Subassembly Alignment Procedure All AA21-4-628-0 1.00 Control Interface Subassembly Alignment Procedure All Test Equipment TC21-400-401-0 1.00 AA21 Test Cable Schematic All TC21-400-701-0 1.00 AA21 Test Cable Parts List All TJ-252-954-0 1.00 Resistor Load Box Test/Assembly Jig All TJ-252-954-1 1.00 Resistor Load Box Test/Assembly Jig All End of Section 5.0

Part No.: AA21-400 Description: Cabin PA System Document #: AA21-400-518-0 Rev.: 1.32 Acceptance Test Procedure: AA21-400-614-0 ATP Rev.: See Build Standard Serial Number: __________ Rev. 1.32 Page 1 of 2 ENG-FORM: 518-0100.DOTX Oct 25, 2016 CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. ATP Results Output Test Requirement Observation Pass 5. Performance Test 5.1 Switched Power 5.1.2 TS-AAD ALRT illuminates red, AA21-400 ON illuminates green 5.2 Sidetone 5.2.2 7.8 r0.5 Vrms <1% THD 5.2.3 6.9 r0.6 Vrms 5.2.4 6.2 r0.6 Vrms 5.2.5 Audio heard in headset 5.3 External Speaker 5.3.1.2 500 r50 mVrms <1% THD 5.3.1.3 <5 mVrms 5.3.1.4 450 r40 mVrms 5.3.1.5 405 r40 mVrms 5.3.2.1 Wail siren audio heard, 500 r50 mVrms 5.3.2.2 Yelp siren audio heard, 500 r50 mVrms 5.3.2.3 No siren audio heard, <2 mVrms 5.3.3.1 <2 mVrms 5.3.3.2 500 r50 mVrms <1% THD 5.4 Internal Speaker 5.4.1.1 <2 mVrms 5.4.1.2 14.1 r0.5 Vrms <10% THD 5.4.1.3 12.2 r1.0 Vrms 5.4.1.4 11.0 r1.0 Vrms 5.4.1.5 9.6 r0.8 Vrms in d3 sec 14.1 r0.5 Vrms in d3 sec 5.4.2.1 Sinewave continuously cycles, 5.5 – 7 Vrms 5.4.2.3 <10 mVrms 5.4.2.4 Discontinuous waveform 5.4.3.1 14.2 r0.5 Vrms <10% THD 5.4.3.2 <5 mVrms 5.4.3.3 13.0 r1.0 Vrms 5.4.3.4 11.8 r1.0 Vrms 5.4.3.5 9.9 r0.6 Vrms

AA21-400 Acceptance Test Report Rev. 1.32 Page 2 of 2 ENG-FORM: 518-0100.DOTX Oct 25, 2016 CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. ATP Results Output Test Requirement Observation Pass 5.5 Backlighting 5.5.1 Uniform backlighting 5.6 Power Off 5.6.1 AA21-400 ON extinguishes, TS-AAD ALRT extinguishes 5.7 J101 5.7.2 <1.7V 5.7.3 <1.7V 6. Visual Inspection 6.1 No defects or omissions found Authorized Inspection Stamp: Signature: Date:

Part No.: AA21-400 Description: Cabin PA System Document No.: AA21-400-614-0 Rev.: 1.31 Rev. 1.31 Page i ENG-FORM: 614-0112.DOT CONFIDENTIAL AND PROPRIETARY TO COBHAM Prepared By: Checked By: Approved By: Revisions Rev. DCA # Date Description of Change 1.30 W13518 Dec 5, 2013 Added section 5.7. 1.31 W13599 Jan 27, 2014 Updated section 5.7. Geoff Melton 2014.01.27 12:16:16 -08'00' Edward Uy 2014.01.27 13:08:49 -08'00' Zack Pahlman 2014.01. 27 18:05:43 -08'00' SEALED 2014.01.28 11:48:04 -08'00'

Part No.: AA21-400 Description: Cabin PA System Document No.: AA21-400-614-0 Rev.: 1.31 Rev. 1.31 Page 1 of 6 ENG-FORM: 614-0112.DOT CONFIDENTIAL AND PROPRIETARY TO COBHAM 1. Product Description The AA21 provides control for an aircraft’s internal and external PA systems. Audio inputs include microphone, receive audio or CD input. Receive audio or PA mic input is selectable on the front panel. Adjustable sidetone is provided for the mic input. A PA output with adjustable level is available. Thermal and short circuit protection are provided for the internal speaker output electronics. Wail or yelp siren is selectable on the front panel and activated by enabling the siren keyline. 2. Test Equipment Model No. Manufacturer Description - - Power Supply 0-33 Vdc @ ≤ 3A ATS-1* Audio Precision Audio Analyzer TS-AAD Cobham Test Panel TC21-400 Cobham Test Cable TJ-252* Cobham Resistor Load Box 1740A* Hewlett Packard Oscilloscope H10-36* David Clark Headset 177* Fluke Multimeter *- an approved equivalent may be substituted. 3. Pre-connection Checks 3.1 Shake Test Shake the AA21 in your hands to make sure there are no loose objects or parts inside the enclosure.

Rev. 1.31 Page 2 of 6 ENG-FORM: 614-0112.DOT CONFIDENTIAL AND PROPRIETARY TO COBHAM 4. Test Setup Check test equipment for valid calibration labels. Figure 1: Test Setup WARNING Turning on the ALERT power switch S2 on TS-AAD will damage the unit under test. 4.1 Set the TS-AAD switches as follows: a) DIR1 and DIR2 switches down. b) TX1 through TX5 switches down. c) RX1 through RX8 switches down. d) PILOT, COPILOT and PAX load switches to the 600 OHM position. e) ICS TIE LOAD switch to the OFF position. f) ON, ALRT, LTS (+28) and LTS (+5) switches down. g) H/S OUT switch to the 4 position. h) MIC INPUT switch to the 3 position. 4.2 Set the AA21 as follows: a) POWER switch to down. b) EXT / INT switch to EXT. c) WAIL / OFF / YELP switch to OFF. d) PA / RADIO switch to PA. e) VOL set fully cw.

Rev. 1.31 Page 3 of 6 ENG-FORM: 614-0112.DOT CONFIDENTIAL AND PROPRIETARY TO COBHAM 4.3 Connect AA21 connector J101 to TS-AAD connectors J101, J102 and to the TJ-252 using the TC21-400 test cable. 4.4 Set the TJ-252 to 8 Ω. 4.5 Connect the audio analyzer generator output to TS-AAD MIC INPUT. 4.6 Connect the audio analyzer input to TS-AAD H/S OUT. 4.7 Turn on the power supply, set for 28 ±0.25 Vdc and confirm with a digital multimeter. Turn off the power supply. 4.8 Connect the power supply to TS-AAD 28 VDC connector (J1). Turn on the power supply and audio analyzer. 5. Performance Test 5.1 Switched Power 5.1.1 Set TS-AAD ON switch to the up position. TS-AAD ON LED will illuminate red. 5.1.2 Set the AA21 POWER switch to the up position. TS-AAD ALRT LED should illuminate red and AA21 ON LED should illuminate green. 5.2 Sidetone 5.2.1 Set the audio analyzer generator output to 1 kHz @ 130 mVrms. 5.2.2 Depress and hold TS-AAD A1. The audio analyzer should read 7.8 ±0.5 Vrms with <1.0 % THD. Release TS-AAD A1. 5.2.3 Set the audio analyzer generator output to 350 Hz. Depress and hold TS-AAD A1. The audio analyzer should read 6.9 ±0.6 Vrms. Release TS-AAD A1. 5.2.4 Set the audio analyzer generator output to 3 kHz. Depress and hold TS-AAD A1. The audio analyzer should read 6.2 ±0.6 Vrms. Release TS-AAD A1. WARNING: High volume settings can cause hearing damage. Set the headset volume control to the minimum volume setting prior to conducting this test and slowly increase the headset volume level to a comfortable listening level. 5.2.5 Disconnect the audio analyzer generator output from TS-AAD MIC INPUT connector J16. Set TS-AAD PAX3 LOAD switch S11 to the center position. Plug the headset into TS-AAD PAX3 connector (J4). Depress and hold TS-AAD A1 and speak into the headset microphone. Audio should be heard in the headset. Release TS-AAD A1. 5.2.6 Disconnect the headset from TS-AAD PAX3 connector (J4). Set TS-AAD PAX3 LOAD switch to the 600 OHM position and connect the audio analyzer generator output to TS-AAD MIC INPUT connector J16.

Rev. 1.31 Page 4 of 6 ENG-FORM: 614-0112.DOT CONFIDENTIAL AND PROPRIETARY TO COBHAM 5.3 External Speaker 5.3.1 PA Mic Input 5.3.1.1 Set the audio analyzer generator output to 1 kHz. Set the TS-AAD H/S OUT switch to the 3 position. 5.3.1.2 Depress and hold TS-AAD A1. The audio analyzer should read 500 ±50 mVrms with <1% THD. Release TS-AAD A1. 5.3.1.3 Depress and hold TS-AAD A1. Adjust AA21 VOL control fully ccw. The audio analyzer should read <5 mVrms. Release TS-AAD A1. Adjust AA21 VOL control fully cw. 5.3.1.4 Set the audio analyzer generator output to 350 Hz. Depress and hold TS-AAD A1. The audio analyzer should read 450 ±40 mVrms. Release TS-AAD A1. 5.3.1.5 Set the audio analyzer generator output to 3 kHz. Depress and hold TS-AAD A1. The audio analyzer should read 405 ±40 mVrms. Release TS-AAD A1. 5.3.1.6 Set the audio analyzer generator output to 1 kHz. 5.3.2 Siren Audio 5.3.2.1 Set the AA21 siren mode switch to WAIL. Depress and hold TS-AAD A3. WAIL siren audio should be present on the audio analyzer speaker. The audio analyzer should read 500 ±50 mVrms. 5.3.2.2 Set the AA21 siren mode switch to YELP. YELP siren audio should be present on the audio analyzer speaker. The audio analyzer should read 500 ±50 mVrms. 5.3.2.3 Set the AA21 siren mode switch to OFF. No siren audio should be present on the audio analyzer speaker. The audio analyzer should read <2 mVrms. Release TS-AAD A3. 5.3.3 Radio Input 5.3.3.1 Set the AA21 input switch to RADIO. Depress and hold TS-AAD A1. The audio analyzer should read <2 mVrms. Release TS-AAD A1. 5.3.3.2 Connect the audio analyzer generator output to TS-AAD SIG GEN. Set the TS-AAD RX1 switch to the up position. Set the audio analyzer generator output to 2.5 Vrms @ 1kHz. The audio analyzer should read 500 ±50 mVrms with <1% THD. Set the TS-AAD RX1 switch to the down position. 5.4 Internal Speaker 5.4.1 Radio Input CAUTION: For this section, when instructed to set TS-AAD switch RX1 to the up position, do so for less than 30 seconds at a time. 5.4.1.1 Connect the audio analyzer input to the TJ-252. Set the TS-AAD RX1 switch to the up position. The audio analyzer should read <2 mVrms.

Rev. 1.31 Page 5 of 6 ENG-FORM: 614-0112.DOT CONFIDENTIAL AND PROPRIETARY TO COBHAM 5.4.1.2 Set the AA21 output switch to INT. The audio analyzer should read 14.1 ±0.5 Vrms with <10% THD. Set the TS-AAD RX1 switch to the down position. 5.4.1.3 Set the audio analyzer generator output to 350 Hz. Set the TS-AAD RX1 switch to the up position. The audio analyzer should read 12.2 ±1.0 Vrms. Set the TS-AAD RX1 switch to down. 5.4.1.4 Set the audio analyzer generator output to 6 kHz. Set the TS-AAD RX1 switch to the up position. The audio analyzer should read 11.0 ±1.0 Vrms. Set the TS-AAD RX1 switch to the down position. 5.4.1.5 Set the audio analyzer generator output to 1 kHz. Set the TS-AAD RX1 switch to the up position. Depress and hold TS-AAD A2. The audio analyzer should read 9.6 ±0.8 Vrms within 3 seconds. Release TS-AAD A2. The audio analyzer should read 14.1 ±0.5 Vrms within 3 seconds. Set the TS-AAD RX1 switch to the down position. 5.4.2 Short Circuit Protection 5.4.2.1 Set TJ-252 to 2.5 Ω. Connect an oscilloscope probe to the positive terminal of TJ-252. Connect the multimeter to TJ-252. Set the multimeter to read AC Volts on the 60 V manual setting. Set the min/max setting to "max". Set TS-AAD switch RX1 to the up position. The multimeter should display a peak voltage of 5.5-7.0 Vrms, while the sinewave level cycles continuously on the scope and audio analyzer. Set TS-AAD switch RX1 to the down position and disconnect the multimeter. 5.4.2.2 Connect the audio analyzer generator output to TS-AAD MIC INPUT. Set the audio analyzer generator output to 1 kHz @ 130 mVrms. 5.4.2.3 Set the AA21 input switch to PA. The audio analyzer should read <10 mVrms. 5.4.2.4 Depress, release and depress TS-AAD A1 within 1 second and hold. A discontinuous sinusoidal waveform should be present on the oscilloscope. Release TS-AAD A1. Set TJ-252 to 8 Ω. Remove the oscilloscope probe from the TJ-252. 5.4.3 PA Mic Input CAUTION: For this section, when instructed to depress TS-AAD A1, do so for less than 30 seconds at a time. 5.4.3.1 Depress and hold TS-AAD A1. The audio analyzer should read 14.2 ±0.5 Vrms with <10% THD. Release TS-AAD A1. 5.4.3.2 Depress and hold TS-AAD A1. Adjust AA21 VOL control fully ccw. The audio analyzer should read <5 mVrms. Release TS-AAD A1. Adjust AA21 VOL control fully cw. 5.4.3.3 Set the audio analyzer generator output to 350 Hz. Depress and hold TS-AAD A1. The audio analyzer should read 13.0 ±1.0 Vrms. Release TS-AAD A1. 5.4.3.4 Set the audio analyzer generator output to 3 kHz. Depress and hold TS-AAD A1. The audio analyzer should read 11.8 ±1.0 Vrms. Release TS-AAD A1. 5.4.3.5 Set the audio analyzer generator output to 1 kHz. Depress and hold TS-AAD A1 and A2. The audio analyzer should read 9.9 ±0.6 Vrms. Release TS-AAD A1 and A2.

Rev. 1.31 Page 6 of 6 ENG-FORM: 614-0112.DOT CONFIDENTIAL AND PROPRIETARY TO COBHAM 5.5 Backlighting 5.5.1 Shield the AA21 faceplate from light as much as possible. Set TS-AAD LTS (+28) switch to the up position. The AA21 faceplate should illuminate with consistent (well distributed) backlighting. Set TS-AAD LTS (+28) to the down position. 5.6 Power Off 5.6.1 Set the AA21 POWER switch to the down position. AA21 ON LED and TS-AAD ALRT LED DS2 should extinguish. 5.6.2 Set TS-AAD ON switch to the down position. 5.7 J101 5.7.1 Unplug unit from test set. Set the AA21 POWER switch to the up position. 5.7.2 Set multimeter to diode test mode. Use multimeter to measure between J101 pin 1 (positive red lead of multimeter) and J101 pin 8 (negative black lead of multimeter). Ensure that multimeter reads less than 1.7V. 5.7.3 Use multimeter to measure between J101 pin 2 (positive red lead of multimeter) and J101 pin 8 (negative black lead of multimeter). Ensure that multimeter reads less than 1.7V. 6. Visual Inspection 6.1 Referencing the Mechanical Installation drawing listed on the appropriate Build Standard, check all dimensions, labels, finishes and hardware items to confirm there are no defects or omissions. Check that connectors are free from damage. End of acceptance test procedure

Description: Main Subassembly Document #: AA21-1A\628-0 Rev.: 1.20 Prepared By: Checked By: Approved By: Rev. 1.20 Aug 09, 2007 Page 1 of 6 ENG-FORM: 628-0105.DOT CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD. 1. Purpose of AA21-1A The AA21-1A, used in conjunction with an AA21-4, provides control for an aircraft’s internal and external PA systems. Audio inputs include microphone, receive or CD audio input. Receive audio is muted softly when the PA key is active. Adjustable sidetone is provided for the mic input. Wail or yelp siren modes with adjustable sweep rates are available on the PA output. All input and output audio levels are internally adjustable by trimmer potentiometers. 2. Test Equipment Model # Manufacturer Description - - Power Supply 0-33 Vdc @ 4 A ATS-1* Audio Precision Audio Analyzer 177* Fluke Multimeter TS-AAD NAT Test Panel TC21-400 NAT Test Cable TJ-252* NAT Resistor Load Box 1740A* Hewlett Packard Oscilloscope TJ-107 NAT AA21-1A Test Jig H10-36* David Clark Headset *- an approved equivalent may be substituted. 3. Pre-connection Checks N/A

Page 2 of 6 Aug 09, 2007 Rev. 1.20 ENG-FORM: 628-0105.DOT CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD. 4. Test Setup Check test equipment for valid calibration labels. Figure 1: Setup 4.1 Set the TS-AAD switches as follows: a) DIR1 and DIR2 switches down. b) TX1 through TX5 switches down. c) RX1 through RX8 switches down. d) PILOT, COPILOT and PAX load switches to the 600 OHM position. e) ICS TIE LOAD switch to the OFF position. f) ON, ALRT, LTS (+28) and LTS (+5) switches down. g) H/S OUT switch to the 4 position. h) MIC INPUT switch to the 3 position. 4.2 Set the TJ-107 as follows: a) POWER switch to down. b) EXT / INT switch to EXT. c) WAIL / OFF / YELP switch to OFF. d) PA / RADIO switch to PA. e) VOL set fully cw.

Rev. 1.20 Aug 09, 2007 Page 3 of 6 ENG-FORM: 628-0105.DOT CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD. 4.3 Confirm there are shorting blocks on the following AA21-1A jumpers: a) JP104. b) JP105 pins 1 - 2. 4.4 Set all AA21-1A trimpots to midway. 4.5 Connect TJ-107 ribbon cable (part of TJ-107) to AA21-1A connector J102. 4.6 Connect AA21-1A connector J101 to TS-AAD connectors J101, J102 and to the TJ-252 using the TC21-400 test cable. 4.7 Set the TJ-252 to 8 Ω. 4.8 Connect the audio analyzer generator output to TS-AAD MIC INPUT. 4.9 Connect the audio analyzer input to TS-AAD H/S OUT. 4.10 Turn on the power supply, set for 28 ±0.25 Vdc and confirm with a digital multimeter. Turn off the power supply. 4.11 Connect the power supply to TS-AAD 28 VDC connector (J1). Turn on the power supply and audio analyzer. 5. Alignment Procedure Refer to the Component Locator listed on the appropriate Subassembly Build Standard for all specified component locations. 5.1 Switched Power 5.1.1 Set TS-AAD ON switch to the up position. TS-AAD ON LED will illuminate red. 5.1.2 Set TJ-107 POWER switch to the up position. TS-AAD ALRT LED should illuminate red and TJ-107 ON LED should illuminate green. 5.2 Sidetone 5.2.1 Set the audio analyzer generator output and set to 1 kHz @ 130 mVrms. 5.2.2 Depress and hold TS-AAD A1. Adjust AA21-1A trim pot R159 until the audio analyzer reads 7.7 +0.1/-0 Vrms with <1.0% THD. Release TS-AAD A1. 5.2.3 Set the audio analyzer generator output to 350 Hz. Depress and hold TS-AAD A1. The audio analyzer should read 6.9 ±0.6 Vrms. Release TS-AAD A1. 5.2.4 Set the audio analyzer generator output to 3 kHz. Depress and hold TS-AAD A1. The audio analyzer should read 6.2 ±0.6 Vrms. Release TS-AAD A1. WARNING: High volume settings can cause hearing damage. Set the headset volume control to the minimum volume setting prior to conducting this test and slowly increase the headset volume level to a comfortable listening level.

Page 4 of 6 Aug 09, 2007 Rev. 1.20 ENG-FORM: 628-0105.DOT CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD. 5.2.5 Disconnect the audio analyzer generator output from TS-AAD MIC INPUT connector J16. Set TS-AAD PAX3 LOAD switch S11 to the center position. Plug the headset into TS-AAD PAX3 connector (J4). Depress and hold TS-AAD A1 and speak into the headset microphone. Audio should be heard in the headset. Release TS-AAD A1. 5.2.6 Disconnect the headset from TS-AAD PAX3 connector (J4). Set TS-AAD PAX3 LOAD switch S11 to the 600 OHM position and connect the audio analyzer generator output to TS-AAD MIC INPUT connector J16. 5.3 External Speaker 5.3.1 PA Mic Input 5.3.1.1 Set the audio analyzer generator output to 1 kHz. Set TS-AAD H/S OUT switch to the 3 position. 5.3.1.2 Adjust AA21-1A trim pot R127 fully ccw. Depress and hold TS-AAD A1. Adjust AA21-1A trim pot R126 until the audio analyzer reads 1.20 ±0.05 Vrms with <1% THD. Adjust AA21-1A trim pot R127 cw until the audio analyzer reads 500 ±5 mVrms. Release TS-AAD A1. 5.3.1.3 Depress and hold TS-AAD A1. Adjust TJ-107 VOL control fully ccw. The audio analyzer should read <5 mVrms. Release TS-AAD A1. Adjust TJ-107 VOL control fully cw. 5.3.1.4 Set the audio analyzer generator output to 350 Hz. Depress and hold TS-AAD A1. The audio analyzer should read 450 ±40 mVrms. Release TS-AAD A1. 5.3.1.5 Set the audio analyzer generator output to 3 kHz. Depress and hold TS-AAD A1. The audio analyzer should read 405 ±40 mVrms. Release TS-AAD A1. 5.3.1.6 Set the audio analyzer generator output to 1 kHz. Set TS-AAD ON switch to the down position. Remove AA21-1A jumper JP104. Set TS-AAD ON to the up position. 5.3.1.7 Depress and hold TS-AAD A1. The audio analyzer should read 6.5 ±0.5 Vrms. Release TS-AAD A1. 5.3.1.8 Set TS-AAD ON to the down position. Install AA21-1A jumper JP104. 5.3.2 Siren Audio 5.3.2.1 Set the multimeter to measure resistance. Connect the common lead to the AA21-1A heatsink and the positive lead to AA21-1A TP1. The multimeter should read >10 MΩ. 5.3.2.2 Set TJ-107 siren mode switch to YELP. Adjust AA21-1A trim pot R222 until the multimeter reads 8.5 ±0.5 kΩ. 5.3.2.3 Set TJ-107 siren mode switch to WAIL. Adjust AA21-1A trim pot R221 until the multimeter reads 165 ±5.0 kΩ. 5.3.2.4 Remove multimeter leads from the AA21-1A. 5.3.2.5 Set TS-AAD ON switch to the up position. Depress and hold TS-AAD A3. WAIL siren audio should be present on the audio analyzer speaker. Adjust AA21-1A trim pot R179 until the audio analyzer reads at 500 ±5 mVrms. 5.3.2.6 Set TJ-107 siren mode switch to YELP. YELP siren audio should be present on the audio analyzer speaker. The audio analyzer should read 500 ±50 mVrms.

Rev. 1.20 Aug 09, 2007 Page 5 of 6 ENG-FORM: 628-0105.DOT CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD. 5.3.2.7 Set TJ-107 siren mode switch to OFF. No siren audio should be present on the audio analyzer speaker. The audio analyzer should read <2 mVrms. Release TS-AAD A3. 5.3.3 Radio Input 5.3.3.1 Set TJ-107 input switch to RADIO. Depress and hold TS-AAD A1. The audio analyzer should read <2 mVrms. Release TS-AAD A1. 5.3.3.2 Connect the audio analyzer generator output to TS-AAD SIG GEN. Set the TS-AAD RX1 switch to the up position. Set the audio analyzer generator output to 2.5 Vrms @ 1kHz. Adjust AA21-1A trim pot R173 until the audio analyzer reads 500 ±5 mVrms with <1% THD. Set the TS-AAD RX1 switch to the down position. 5.3.3.3 Set TS-AAD ON switch to the down position. Move AA21-1A jumper JP105 to pins 2-3. Set TS-AAD ON switch to the up position. Set the TS-AAD RX2 switch to the up position. 5.3.3.4 Set the audio analyzer generator output to 1.0 Vrms @ 1kHz. The audio analyzer should read 820 ±50 mVrms with <1% THD. Set the TS-AAD RX2 switch to the down position. 5.3.3.5 Set TS-AAD ON switch to the down position. Move AA21-1A jumper JP105 to pins 1-2. Set TS-AAD ON to the up position. 5.4 Internal Speaker 5.4.1 Radio Input CAUTION: For this section, when instructed to set TS-AAD RX1 switch to the up position, do so for less than 30 seconds at a time. 5.4.1.1 Set the TS-AAD RX1 switch to the up position. Set the audio analyzer generator output to 2.5 Vrms @ 1kHz. Connect the audio analyzer input to the TJ-252. The audio analyzer should read <2 mVrms. Set the TS-AAD RX1 switch to the down position. Set TJ-107 EXT/INT switch to INT. 5.4.1.2 Set the TS-AAD RX1 switch to the up position. Adjust AA21-1A trim pot R138 until the audio analyzer reads 14.1 ±0.1 Vrms with <10% THD. Set the TS-AAD RX1 switch to the down position. 5.4.1.3 Set the audio analyzer generator output to 350 Hz. Set the TS-AAD RX1 switch to the up position. The audio analyzer should read 12.2 ±1.0 Vrms. Set the TS-AAD RX1 switch to the down position. 5.4.1.4 Set the audio analyzer generator output to 6 kHz. Set the TS-AAD RX1 switch to the up position. The audio analyzer should read 11.0 ±1.0 Vrms. Set the TS-AAD RX1 switch to the down position. 5.4.1.5 Set the audio analyzer generator output to 1 kHz. Set the TS-AAD RX1 switch to the up position. Depress and hold TS-AAD A2. The audio analyzer should read 9.6 ±0.8 Vrms within 3 seconds. Release TS-AAD A2. The audio analyzer should read 14.1 ±0.5 Vrms within 3 seconds. Set the TS-AAD RX1 switch to the down position.

Page 6 of 6 Aug 09, 2007 Rev. 1.20 ENG-FORM: 628-0105.DOT CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD. 5.4.2 Short Circuit Protection 5.4.2.1 Set the TJ-252 to 2.5 Ω. Connect an oscilloscope probe to the positive terminal of the TJ-252. Connect the multimeter to the TJ-252. Set the multimeter to read AC Volts on the 60 V manual setting. Set the min/max setting to "max". Set the TS-AAD RX1 switch to the up position. The multimeter should display a peak voltage of 5.5 – 7 Vrms while the sinewave level continuously cycles on the oscilloscope and audio analyzer. Set the TS-AAD RX1 switch to the down position and disconnect the multimeter. 5.4.2.2 Connect the audio analyzer generator output to TS-AAD MIC INPUT connector J16. Set the audio analyzer generator output to 1 kHz @ 130 mVrms. 5.4.2.3 Set the TJ-107 input switch to PA. The audio analyzer should read <10 mVrms. 5.4.2.4 Depress, release and depress TS-AAD A1 within 1 second and hold. A discontinuous sinusoidal waveform should be present on the oscilloscope. Release TS-AAD A1. Set the TJ-252 to 8 Ω. Remove the oscilloscope probe from the TJ-252. 5.4.3 PA MIC Input CAUTION: For this section, when instructed to depress TS-AAD A1, do so for less than 30 seconds at a time. 5.4.3.1 Depress and hold TS-AAD A1. The audio analyzer should read 14.1±0.5 Vrms with <10% THD. Release TS-AAD A1. 5.4.3.2 Depress and hold TS-AAD A1. Adjust TJ-107 VOL control fully ccw. The audio analyzer should read <5 mVrms. Release TS-AAD A1. Adjust TJ-107 VOL control fully cw. 5.4.3.3 Set the audio analyzer generator output to 350 Hz. Depress and hold TS-AAD A1. The audio analyzer should read 13.0 ±1.0 Vrms. Release TS-AAD A1. 5.4.3.4 Set the audio analyzer generator output to 3 kHz. Depress and hold TS-AAD A1. The audio analyzer should read 11.8 ±1.0 Vrms. Release TS-AAD A1. 5.4.3.5 Set the audio analyzer generator output to 1 kHz. Depress and hold TS-AAD A1 and A2. The audio analyzer should read 9.9 ±0.6 Vrms. Release TS-AAD A1 and A2. 5.5 Power Off 5.5.1 Set TJ-107 POWER switch down. TJ-107 ON LED and TS-AAD ALRT LED should extinguish. 5.5.2 Set TS-AAD ON switch to the down position. End of alignment procedure

Description: Control Interface Subassembly Document #: AA21-4\628-0 Rev: 1.00 Prepared By: Checked By: Approved By: Rev. 1.00 Nov 29, 1999 Page 1 of 3 ENG-FORM: 628-0103.DOT CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD. 1. Purpose of AA21-4 The AA21-4 Control Interface subassembly provides front panel controls and annunciators for the AA21-4xx series Cabin PA System. Control switches include Power, EXT/INT, PA/RADIO, and WAIL/OFF/YELP. A green LED provides power status indication. A potentiometer provides output level adjustment. 2. Test Equipment Model # Manufacturer Description - - Power Supply 0-33 Vdc @ 0.5 A TS-AAD NAT Test Panel TJ-106 NAT AA21-4 Test Jig AA21-5 NAT Backlighting Subassembly 83* Fluke Digital Multimeter *- an approved equivalent may be substituted. 3. Pre-connection Checks Not Applicable 4. Test Setup Refer to the Component Locator listed on the appropriate Subassembly Build Standard for all specified component locations. Ensure test equipment has valid calibration labels. 4.1 Set the TS-AAD switches as follows: a) ON, ALRT, LTS (+28) and LTS (+5) switches down. b) MIC INPUT switch to the 1 position.

Page 2 of 3 Nov 29, 1999 Rev. 1.00 ENG-FORM: 628-0103.DOT CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD. 4.2 Set up the AA21-4 as follows: a) R401 fully ccw b) S401-S403 to the down position c) S404 to the middle position 4.3 Connect TJ-106 J101 to TS-AAD J101. 4.4 Connect AA21-4 J401 to TJ-106 J102. 4.5 Connect AA21-5 J501 to AA21-4 J402. 4.6 Connect the multimeter to TS-AAD MIC INPUT. 4.7 Turn on the power supply and adjust the output to 28 ± 0.25 Vdc. Turn off the power supply. 4.8 Connect the power supply to TS-AAD 28 VDC (J1). 5. Alignment Procedure 5.1 Turn on the power supply. TS-AAD DS7, DS9, and DS10 will illuminate red. 5.2 Set TS-AAD ON to the up position. The TS-AAD ON indicator will illuminate red. 5.3 Set AA21-4 S401 to the up position. AA21-4 DS401 should illuminate green. TS-AAD ALRT should illuminate red. AA21-5 DS501 to DS506 should illuminate. 5.4 Remove the AA21-5 from the AA21-4. 5.5 Set AA21-4 S402 to the up position. TS-AAD DS6 should illuminate red and TS-AAD DS7 should go dark. 5.6 Set AA21-4 S404 to the up position. TS-AAD DS13 and DS15 should illuminate red. 5.7 Set AA21-4 S404 to the middle position. TA-AAD DS13 and DS15 should go dark. 5.8 Set AA21-4 S404 to the down position. TS-AAD DS14 and DS16 should illuminate red.

Rev. 1.00 Nov 29, 1999 Page 3 of 3 ENG-FORM: 628-0103.DOT CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD. 5.9 Set AA21-4 S403 to the up position. TS-AAD DS8 and DS11 should illuminate red. TS-AAD DS9 and DS10 should go dark. 5.10 Set the multimeter to measure resistance. The multimeter should read < 2.5 Ω. 5.11 Adjust AA21-4 R401 fully cw. The multimeter should read between 9.0 and 11.0 kΩ. 5.12 Set TS-AAD ON to the down position and turn the power supply off. 5.13 Remove the AA21-4 from TJ-106. End of alignment procedure

REV. SHEET DWG. NO. DWG. TYPE FILE DESIGNED DRAWN DATE CHECKED APPROVED SIZE CAGE CODE PART NO. TITLE A 3AB01 PROPRIETARY AND CONFIDENTIAL TO NAT LTD. 3 +28V LIGHTS 16 LIGHTS GROUND 6 EXT PA HI 19 EXT PA LO 13 MIC HI 25 MIC LO 9 SIDETONE HI 21 SIDETONE LO 10 PA KEY 11 RECEIVE HI 23 RECEIVE LO 12 RESERVED 24 RESERVED 18 SIREN KEY 22 +3dB 7 SPEAKER A 5 SPEAKER B 14 POWER GROUND 1 +28VDC POWER 37 +28V LTS GND 34 POWER GND 17 +28VDC MAIN PWR 26 MIC3 HI P103 P101 19 +28V LTS P102 25 PIN FEMALE DMIN TO AA21 J101 50 PIN MALE DMIN TO TS-AAD J101 37 PIN MALE DMIN TO TS-AAD J102 SRK SRK MAR 10/99 401-0100.SCH SCHEMATIC TC21\400\401-0 TC21-400 1.00 1/1 AA21 TEST CABLE 48 PHN4 LO 31 PHN4 HI 43 MIC3 LO 11 A1 12 A2 13 A3 30 PHN3 HI 7 RX1 HI 26 LO 8 RX2 HI 27 LO 47 PHN3 LO 1 LOAD + 1 LOAD - P104 BANANA PLUG, RED TO 8 OHM, 100W LOAD 38 POWER GND NOTES: UNLESS OTHERWISE SPECIFIED 1. UNLESS OTHERWISE NOTED, ALL WIRES ARE WHITE 22 AWG AND 3 FEET IN LENGTH RED RED BLK BLK 15 POWER GROUND BLK 2 +28VDC POWER 8 SWITCHED POWER 16 +28VDC ALERT PWR 17 SHIELD 20 SHIELD 4 N/C 20 AWG 20 AWG RED 20 AWG 20 AWG 20 AWG 20 AWG 5 FEET 5 FEET P105 BANANA PLUG, BLACK TO 8 OHM, 100W LOAD 2. COVER P101 WITH M101, P102 WITH M102, P103 WITH M103 5. LABEL CABLE AS TC21-400 3. REMAINING PINS OF P101 AND P102 ARE NOT CONNECTED 4. LABEL ALL CONNECTORS WITH IDENT AND DESTINATION

Description: Document#: Rev: TC21-400 TC21\400\701-0 AA21 Test Cable 1.00 Prepared By: Checked By: Approved By: IDENT DESCRIPTION OR VALUE QTY. PACKAGE NAT P/N MFR. P/N CONNECTORS P101 D-sub Plug, Solder Cup 50 Pin 20-10-050 1 P102 D-sub Plug, Solder Cup 37 Pin 20-10-037 1 P103 D-sub Socket, Solder Cup 25 Pin 20-20-025 1 P104 Banana Plug, Stacking, Red 0.175" 20-81-082 1 P105 Banana Plug, Stacking, Black 0.175" 20-81-083 1 MECHANICAL PARTS M101 Hood, D-sub, Plastic DD 20-29-051 1 M102 Hood, D-sub, Plastic DC 20-29-038 1 M103 Hood, D-sub, Plastic DB 20-29-026 1 End of Parts List Generated by Parts List Manager Ver: 2.6 Page: 1 of 1 Mar 18, 1999 Rev: 1.00 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM34 Maintenance Manual Build Standard: 5.00 Nov 9, 2016 Page 6-1 ENG-FORM: 862-0100.DOTX CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. Section 6.0 Documentation and Drawings 6.1 Introduction This section includes the drawings necessary for complete maintenance and troubleshooting. To help locate the information required quickly, they are organized in numerical order, as listed below. 6.2 Documentation and Drawings Note: For Parts Lists in this manual and its related supplements, alternate manufacturers‘ part numbers may be used. Consult AEM for approved alternate parts. 6.2.1 Product DRAWING REV. DESCRIPTION TYPE SERIAL # AA21-400 AA21-400-701-0 1.30 Cabin PA System Parts List 066274 and up AA21-400-701-0 1.21 Cabin PA System Parts List 042512 to 066273 AA21-400-701-0 1.10 Cabin PA System Parts List 1200 to 042312 AA21-400-701-0 1.00 Cabin PA System Parts List 1015 to 1199 AA21-400-904-0 1.30 Cabin PA System Exploded View 042512 and up AA21-400-904-0 1.20 Cabin PA System Exploded View 2021 to 042312 AA21-400-904-0 1.10 Cabin PA System Exploded View 1200 to 2020 AA21-400-904-0 1.00 Cabin PA System Exploded View 1015 to 1199 6.2.2 Subassembly DRAWING REV. DESCRIPTION TYPE SERIAL # AA21-1A AA21-1A-401-0 1.30 Main Subassembly Schematic 031413 and up AA21-1A-401-0 1.20 Main Subassembly Schematic 1220 to 031412 AA21-1A-401-0 1.10 Main Subassembly Schematic 1200 to 1219 AA21-1A-401-0 1.00 Main Subassembly Schematic 1015 to 1199 AA21-1A-701-0 1.30 Main Subassembly Parts List 031413 and up AA21-1A-701-0 1.20 Main Subassembly Parts List 1220 to 031412 AA21-1A-701-0 1.10 Main Subassembly Parts List 1200 to 1219 AA21-1A-701-0 1.00 Main Subassembly Parts List 1015 to 1199 AA21-1-904-0 1.00 Main Subassembly Mechanical 1015 to 1199 AA21-1A-904-0 1.00 Main Subassembly Mechanical 1200 and up

SM34 Maintenance Manual Build Standard: 5.00 Nov 9, 2016 Page 6-2 ENG-FORM: 862-0100.DOTX CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. AA21-1-924-0 1.10 Main Subassembly Component Locator 1015 to 1199 AA21-1-924-1 1.10 Main Subassembly Component Locator 1015 to 1199 AA21-1A-924-0 1.20 Main Subassembly Component Locator 041813 and up AA21-1A-924-0 1.10 Main Subassembly Component Locator 031413 to 041713 AA21-1A-924-0 1.00 Main Subassembly Component Locator 1200 to 031412 AA21-1A-924-1 1.10 Main Subassembly Component Locator 031413 and up AA21-1A-924-1 1.00 Main Subassembly Component Locator 1200 to 031412 AA21-4 AA21-4-401-0 1.10 Control Interface Subassembly Schematic 1200 and up AA21-4-401-0 1.00 Control Interface Subassembly Schematic 1015 to 1199 AA21-4-701-0 1.10 Control Interface Subassembly Parts List 1200 and up AA21-4-701-0 1.00 Control Interface Subassembly Parts List 1015 to 1199 AA21-4-904-0 1.00 Control Interface Subassembly Mechanical All AA21-4-924-0 1.00 Control Interface Subassembly Component Locator All AA21-5 AA21-5-401-0 1.00 Backlighting Subassembly Schematic All AA21-5-701-0 1.00 Backlighting Subassembly Parts List All AA21-5-924-0 1.00 Backlighting Subassembly Component Locator All Section 6.0 ends following the above documents

(1*)250'27; Tony Pearson Designer Oct 17, 2016 Steve Kempf Designer Oct 21/16 Todd Blackstock R&D Manager Oct 26/16

Description: Document#: Rev: AA21-400 AA21\400\701-0 Cabin PA System 1.10 Prepared By: Checked By: Approved By: IDENT DESCRIPTION OR VALUE QTY. PACKAGE NAT P/N MFR. P/N SUBASSEMBLIES SA1 Main AA21-1A 1 SA2 Control Interface AA21-4 1 SA3 Backlighting AA21-5 1 CABLE ASSEMBLIES W1 IDC to IDC, Ribbon, 3" 26 Cond 08-60-2630 1 MECHANICAL PARTS M1 Chassis, AA21 50-02-053 1 M2 Cover, AA21-400 50-03-018 1 M3 Faceplate, Blank, AA21-400 55-01-021 1 M4 Label, Product, AA21 43-30-121 1 M5 Fastener, Dzus, Black 25-25-008 4 M6 Knob, Fluted, Rubber 40-18-002 1 M7 Locking Hardware, D-sub, Pair 25 Pin 20-27-025 1 M8 Screw, Panhead, Phillips, Steel MS35206-214 4-40, 0.32" 25-10-214 6 M9 Screw, Flathead, Phillips, Steel MS24693S2 4-40, 0.235" 25-13-932 14 M10 Screw, Panhead, Phillips, Brass, Black MS35214-16 4-40, 0.56" 25-11-416 4 M11 Washer, Locking, Split 25-21-103 2 M12 Bat Cover, Green 85-80-013 1 End of Parts List Generated by Parts List Manager Ver: 2.7 Page: 1 of 1 Dec 8, 1999 Rev: 1.10 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

Description: Document#: Rev: AA21-400 AA21\400\701-0 Cabin PA System 1.00 Prepared By: Checked By: Approved By: IDENT DESCRIPTION OR VALUE QTY. PACKAGE NAT P/N MFR. P/N SUBASSEMBLIES SA1 Main AA21-1A 1 SA2 Control Interface AA21-4 1 SA3 Backlighting AA21-5 1 CABLE ASSEMBLIES W1 IDC to IDC, Ribbon, 3" 26 Cond 08-60-2630 1 MECHANICAL PARTS M1 Chassis, AA21 50-02-053 1 M2 Cover, AA21-400 50-03-018 1 M3 Faceplate, Blank, AA21-400 55-01-021 1 M4 Label, Photo Aluminum, Product 43-30-001 1 M5 Fastener, Dzus, Black 25-25-008 4 M6 Knob, Fluted, Rubber 40-18-002 1 M7 Locking Hardware, D-sub, Pair 25 Pin 20-27-025 1 M8 Screw, Panhead, Phillips, Steel MS35206-214 4-40, 0.32" 25-10-214 6 M9 Screw, Flathead, Phillips, Steel MS24693S2 4-40, 0.235" 25-13-932 14 M10 Screw, Panhead, Phillips, Brass, Black MS35214-16 4-40, 0.56" 25-11-416 4 M11 Washer, Locking, Split 25-21-103 2 M12 Bat Cover, Green 85-80-013 1 M13 Switch Cap, Toggle, Locking, Mat Finish 85-83-001 3 End of Parts List Generated by Parts List Manager Ver: 2.7 Page: 1 of 1 Oct 8, 1999 Rev: 1.00 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

REV. SHEET DWG. NO. DWG. TYPE FILE DESIGNED DRAWN DATE CHECKED APPROVED SIZE CAGE CODE PART NO. TITLE B 3AB01 CONFIDENTIAL AND PROPRIETARY TO NAT LTD. 13 MIC HI 25 MIC LO 1 6 3 4 2 5 T101 MET-31 10 PA KEY 8 SWITCHED POWER 21 SIDETONE LO R117 150 R116 330 C103 22uF C102 0.47uF C101 1000pF C104 1000pF R118 1k R119 1k C105 0.1uF C108 4.7uF R120 10k C106 1000pF 11 RECEIVE HI 23 RECEIVE LO 12 CD HI 24 CD LO 9 SIDETONE HI 22 +3dB 3 +28V LIGHTS 16 LIGHTS GROUND J101 25 PIN D-SUB PLUG 5V 8V + 2 - 4 5 1 3 6 8 U107 TDA7052AN 12V C111 0.22uF R125 4.7k C113 1uF R124 4.7k C112 1uF MIC AMP D118 MURS160T3 R160 220k + 2 - 4 5 1 3 6 8 U108 TDA7052AN 12V C125 0.22uF D120 MURS160T3 SIDE TONE AMP D119 MURS160T3 6 5 2 1 3 T102 R161 1k R162 9.09k R183 4.7k D117 MURS160T3 + 2 - 4 5 1 3 6 8 U114 TDA7052AN 12V R167 60.4 R171 220k C126 0.033uF R168 1k R172 22k C129 33uF R170 4.7k C128 1uF R169 4.7k C127 1uF RECEIVE AMP D113 MURS160T3 D122 MBRS140T3 8V A 1 C 2 NC 3 + 4 5 - 6 U118 LCA110 R185 2.2k 28V R184 330 D123 MURS160T3 R178 4.7k D115 MURS160T3 + 2 - 4 5 1 3 6 8 U115 TDA7052AN 12V R175 13.0k C131 0.22uF C133 1uF R177 4.7k C132 1uF C130 0.1uF R180 100k R176 10k D114 MURS160T3 Vref 1 SET hi 2 SET lo 3 GND 4 V+ 8 over 7 under 6 Vptat 5 U117 TMP01FP 12V R165 18.2k R166 75k C167 10uF C168 0.1uF D134 UF4007 8V Vin 3 GND 2 +8V 1 U121 MC78L08ABP D111 MURS160T3 D112 MURS160T3 C161 330uF Q106 MJF122 D131 1N4742A D132 1N4742A R205 470 C162 100uF C163 0.1uF 22V C164 10uF C165 0.1uF 12V D133 UF4007 C166 10uF 28V D129 UF5407 C158 330uF C159 330uF C160 330uF 22V C123 330uF FL101 0.022uF 1 2 4 3 5 U109 TDA2040V R135 22k R136 680 C121 22uF C120 0.1uF C122 1uF R137 1 R131 22k R130 24.3k C115 0.1uF R132 22k 22V C116 22uF D107 UF4007 D108 UF4007 R129 10k R133 10k C114 0.1uF C117 2200pF C118 1000pF R134 10k 22V 1 2 4 3 5 U110 TDA2040V R143 22k R140 680 C139 22uF C138 0.1uF C135 0.1uF 28V R139 10k R141 10k C134 0.1uF C136 2200pF C137 1000pF R142 10k R149 22k C141 0.22uF R148 1 D109 UF4007 D110 UF4007 C140 1uF 28V R144 1.2 R145 1.2 R146 1.2 R147 1.2 C142 330uF C143 330uF 3 2 1 8 4 U112A LM2904N R151 100k R150 100k R152 47.5k C144 0.01uF R153 100k C145 1000pF C146 2.2uF R154 10k D125 MURS160T3 C147 1uF R155 470k R157 15.0k R156 100k 12V 3 2 1 8 4 U111A LM2903 6V R158 100k 12V 12V 12V 1 2 4 3 5 U113 TDA2040V R188 20k R187 22k R189 22k 28V C148 22uF R190 22k 28V R192 22k C150 22uF R191 680 R197 1 C151 0.22uF D126 UF4007 D127 UF4007 28V C149 1000pF R193 1.2 R194 1.2 R195 1.2 R196 1.2 C152 330uF C153 330uF 12V 5 6 7 U112B LM2904N R198 47.5k C154 0.01uF R199 100k C155 1000pF C156 2.2uF R200 10k D128 MURS160T3 C157 1uF R203 470k R202 15.0k R201 100k 5 6 7 U111B LM2903 6V R204 100k 6 EXT PA HI 19 EXT PA LO 20 SHIELD 1 +28VDC POWER 2 +28VDC POWER 14 POWER GROUND 15 POWER GROUND 7 SPEAKER A 5 SPEAKER B P/O J101 SRK MAD/SRK OCT 8/99 401-0120.SCH SCHEMATIC AA21-1A\401-0 1.20 1/1 AA21-1A MAIN SUBASSEMBLY LEVEL LEVEL SIREN AMP RECEIVE LEVEL SIREN LEVEL C119 330uF TEMPERATURE SENSOR D121 MURS160T3 A 1 C 2 NC 3 + 4 5 - 6 U116 LCA110 R164 2.2k 28V 12 N/C 11 N/C 17 POT HI 8 EXTERNAL SPKR 7 INTERNAL SPKR 13 POWER GROUND D105 MURS160T3 D106 MURS160T3 14 RESERVED 15 POT LO 1 +28VDC POWER 2 +28VDC POWER 3 +28VDC SWITCHED 4 +28VDC SWITCHED 16 POT WIPER 5 LIGHTS GROUND 6 28V LIGHTS R115 8.87k 28V R114 8.87k 28V R111 1k 10 PA 9 RADIO 5V R123 1k 17 SHIELD 18 SIREN KEY D124 MURS160T3 A 1 C 2 NC 3 + 4 5 - 6 U119 LCA110 R186 2.2k 28V R181 4.7k R182 22k 8V SIREN 18 WAIL RETURN 19 YELP RETURN 20 YELP ON 4 N/C 1 3 6 5 4 2 T103 R128 187 JP104 YELP/WAIL KEY P/O J102 J102 26 PIN STRIP PLUG P/O J102 R113 8.87k 28V 21 WAIL ON 22 POWER GROUND 23 RSVSP 24 RECEIVE DISABLE YELP/WAIL KEY CW R138 10k CW R127 10k CW R173 500k CW R179 500k A 1 C 2 A 3 NC 8 NC 7 NO 6 C 4 NO 5 U103 AQW614 A 1 C 2 A 3 NC 8 NC 7 NO 6 C 4 NO 5 U105 AQW614 A 1 C 2 A 3 NC 8 NC 7 NO 6 C 4 NO 5 U104 AQW614 R174 47k Q104 2N2222A Q103 2N2222A Q105 2N2222A INT SPKR EXT SPKR C124 10uF C109 0.33uF Vin 1 GND 2 +5V 3 U124 MIC2954-02BS D135 UF4007 C177 2.2uF 5V VCAin 2 BUFout 3 AUDin + 4 Cavg 5 CRS 6 Vout 7 V+ 8 GND 1 U106 SSM2165-2P C107 1uF JP105 RX / CD C110 0.01uF R163 3.32k NOTES: 1. ALL RESISTANCE VALUES IN OHMS, UNLESS OTHERWISE SPECIFIED. JP101 1 2 3 EXT O/P POT JP102 1 2 3 INT O/P POT JP103 1 2 3 600 O/P 8 150 150 150 150 600 8 150 600 600 150 600 150 150 37 13.5 CD RX 1 2 3 R121 1k C178 0.047uF JP106 PA KEY 1-2 2-3 EXTERNAL VOL CONTROL DISABLED EXTERNAL VOL CONTROL ENABLED JP101 (EXT SPKR) JP102 (INT SPKR) JP103 (O/P IMPEDANCE) JP104 (PA OUTPUT LEVEL) 1-2 2-3 EXTERNAL VOL CONTROL ENABLED 0 - 0.5 Vrms O/P 1-2 EXTERNAL VOL CONTROL DISABLED 0 - 6.5 Vrms O/P INST 2-3 JP106 (PA KEY) JP105 (RX/CD) N/INST N/INST INST 8 OHM O/P IMPEDANCE MIC AUDIO ACTIVATED WITH PA KEY MIC AUDIO LIVE 2. JUMPER TABLE: 600 OHM O/P IMPEDANCE RX AUDIO INPUT ENABLED CD AUDIO INPUT ENABLED 1-2 2-3 D130 1N6288A 2 7 4 9 8 3 5 T105 600 600 2 7 4 9 8 3 5 T104 600 600 MIC PRE-AMP EXTERNAL MIC LEVEL SIDETONE LEVEL CW R126 200k CW R159 200k t RT101 10k t RT102 10k 12V R218 5.11k R219 5.11k C176 10 uF R212 10k C173 1 uF 12V R207 287 12V R210 5.11k R211 5.11k + C172 10 uF C169 1 uF R206 10k 12V C170 0.1 uF R220 1k R213 8.87k R214 1k C174 22 uF R216 10k R215 10k R209 22k R217 8.87k C175 0.1 uF C171 0.1 uF YELP WAIL R208 10k SIREN CW R221 500k CW R222 50k RT 8 RT 7 CT 6 CT 5 V+ 4 M OUT 3 W OUT 2 WAV ADJ 13 FSK IN 9 BYPASS 10 SYNC OUT 11 GND 12 WAV ADJ 14 SYM ADJ 15 SYM ADJ 16 AM IN 1 U123 XR-2206 RT 8 RT 7 CT 6 CT 5 V+ 4 M OUT 3 W OUT 2 WAV ADJ 13 FSK IN 9 BYPASS 10 SYNC OUT 11 GND 12 WAV ADJ 14 SYM ADJ 15 SYM ADJ 16 AM IN 1 U122 XR-2206 SWEEP GENERATOR TONE GENERATOR SINUSOIDAL RECEIVE DISABLE 25 +28VDC POWER 26 +28VDC SWITCHED RECEIVE DISABLE TP1 TO AA21-4x J401 REVISIONS REV DESCRIPTION DATE BY 1.10 ECR #1556 : F101 & F102 ADDED. U112, U120, U121 VAL CHANGE. JAN 3/00 SRK FL102 0.022uF L101 125uH F101 2.5A SLOW Vin 1 GND 2 Vout 3 U120 LM2940T-12 F102 0.5A 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 1.20 ECR #2051 : F101 WAS 2.5A FAST BLOW NAT PART# 23-10-025. APR 23/02 JN

REV. SHEET DWG. NO. DWG. TYPE FILE DESIGNED DRAWN DATE CHECKED APPROVED SIZE CAGE CODE PART NO. TITLE B 3AB01 PROPRIETARY AND CONFIDENTIAL TO NAT LTD. 13 MIC HI 25 MIC LO 1 6 3 4 2 5 T101 MET-31 10 PA KEY 8 SWITCHED POWER 21 SIDETONE LO R117 150 R116 330 C103 22uF C102 0.47uF C101 1000pF C104 1000pF R118 1k R119 1k C105 0.1uF C108 4.7uF R120 10k C106 1000pF 11 RECEIVE HI 23 RECEIVE LO 12 CD HI 24 CD LO 9 SIDETONE HI 22 +3dB 3 +28V LIGHTS 16 LIGHTS GROUND J101 25 PIN D-SUB PLUG 5V 8V + 2 - 4 5 1 3 6 8 U107 TDA7052AN 12V C111 0.22uF R125 4.7k C113 1uF R124 4.7k C112 1uF MIC AMP D118 MURS160T3 R160 220k + 2 - 4 5 1 3 6 8 U108 TDA7052AN 12V C125 0.22uF D120 MURS160T3 SIDE TONE AMP D119 MURS160T3 6 5 2 1 3 T102 R161 1k R162 9.09k R183 4.7k D117 MURS160T3 + 2 - 4 5 1 3 6 8 U114 TDA7052AN 12V R167 60.4 R171 220k C126 0.033uF R168 1k R172 22k C129 33uF R170 4.7k C128 1uF R169 4.7k C127 1uF RECEIVE AMP D113 MURS160T3 D122 MBRS140T3 8V A 1 C 2 NC 3 + 4 5 - 6 U118 LCA110 R185 2.2k 28V R184 330 D123 MURS160T3 R178 4.7k D115 MURS160T3 + 2 - 4 5 1 3 6 8 U115 TDA7052AN 12V R175 13.0k C131 0.22uF C133 1uF R177 4.7k C132 1uF C130 0.1uF R180 100k R176 10k D114 MURS160T3 Vref 1 SET hi 2 SET lo 3 GND 4 V+ 8 over 7 under 6 Vptat 5 U117 TMP01FP 12V R165 18.2k R166 75k C167 10uF C168 0.1uF D134 UF4007 8V Vin 3 GND 2 +8V 1 U121 MC78L08ABP D111 MURS160T3 D112 MURS160T3 C161 330uF Q106 MJF122 D131 1N4742A D132 1N4742A R205 470 C162 100uF C163 0.1uF 22V C164 10uF C165 0.1uF 12V D133 UF4007 C166 10uF 28V D129 UF5407 C158 330uF C159 330uF C160 330uF 22V C123 330uF FL101 0.022uF 1 2 4 3 5 U109 TDA2040V R135 22k R136 680 C121 22uF C120 0.1uF C122 1uF R137 1 R131 22k R130 24.3k C115 0.1uF R132 22k 22V C116 22uF D107 UF4007 D108 UF4007 R129 10k R133 10k C114 0.1uF C117 2200pF C118 1000pF R134 10k 22V 1 2 4 3 5 U110 TDA2040V R143 22k R140 680 C139 22uF C138 0.1uF C135 0.1uF 28V R139 10k R141 10k C134 0.1uF C136 2200pF C137 1000pF R142 10k R149 22k C141 0.22uF R148 1 D109 UF4007 D110 UF4007 C140 1uF 28V R144 1.2 R145 1.2 R146 1.2 R147 1.2 C142 330uF C143 330uF 3 2 1 8 4 U112A LM2904N R151 100k R150 100k R152 47.5k C144 0.01uF R153 100k C145 1000pF C146 2.2uF R154 10k D125 MURS160T3 C147 1uF R155 470k R157 15.0k R156 100k 12V 3 2 1 8 4 U111A LM2903 6V R158 100k 12V 12V 12V 1 2 4 3 5 U113 TDA2040V R188 20k R187 22k R189 22k 28V C148 22uF R190 22k 28V R192 22k C150 22uF R191 680 R197 1 C151 0.22uF D126 UF4007 D127 UF4007 28V C149 1000pF R193 1.2 R194 1.2 R195 1.2 R196 1.2 C152 330uF C153 330uF 12V 5 6 7 U112B LM2904N R198 47.5k C154 0.01uF R199 100k C155 1000pF C156 2.2uF R200 10k D128 MURS160T3 C157 1uF R203 470k R202 15.0k R201 100k 5 6 7 U111B LM2903 6V R204 100k 6 EXT PA HI 19 EXT PA LO 20 SHIELD 1 +28VDC POWER 2 +28VDC POWER 14 POWER GROUND 15 POWER GROUND 7 SPEAKER A 5 SPEAKER B P/O J101 SRK MAD/SRK OCT 8/99 401-0110.SCH SCHEMATIC AA21-1A\401-0 1.10 1/1 AA21-1A MAIN SUBASSEMBLY LEVEL LEVEL SIREN AMP RECEIVE LEVEL SIREN LEVEL C119 330uF TEMPERATURE SENSOR D121 MURS160T3 A 1 C 2 NC 3 + 4 5 - 6 U116 LCA110 R164 2.2k 28V 12 N/C 11 N/C 17 POT HI 8 EXTERNAL SPKR 7 INTERNAL SPKR 13 POWER GROUND D105 MURS160T3 D106 MURS160T3 14 RESERVED 15 POT LO 1 +28VDC POWER 2 +28VDC POWER 3 +28VDC SWITCHED 4 +28VDC SWITCHED 16 POT WIPER 5 LIGHTS GROUND 6 28V LIGHTS R115 8.87k 28V R114 8.87k 28V R111 1k 10 PA 9 RADIO 5V R123 1k 17 SHIELD 18 SIREN KEY D124 MURS160T3 A 1 C 2 NC 3 + 4 5 - 6 U119 LCA110 R186 2.2k 28V R181 4.7k R182 22k 8V SIREN 18 WAIL RETURN 19 YELP RETURN 20 YELP ON 4 N/C 1 3 6 5 4 2 T103 R128 187 JP104 YELP/WAIL KEY P/O J102 J102 26 PIN STRIP PLUG P/O J102 R113 8.87k 28V 21 WAIL ON 22 POWER GROUND 23 RSVSP 24 RECEIVE DISABLE YELP/WAIL KEY CW R138 10k CW R127 10k CW R173 500k CW R179 500k A 1 C 2 A 3 NC 8 NC 7 NO 6 C 4 NO 5 U103 AQW614 A 1 C 2 A 3 NC 8 NC 7 NO 6 C 4 NO 5 U105 AQW614 A 1 C 2 A 3 NC 8 NC 7 NO 6 C 4 NO 5 U104 AQW614 R174 47k Q104 2N2222A Q103 2N2222A Q105 2N2222A INT SPKR EXT SPKR C124 10uF C109 0.33uF Vin 1 GND 2 +5V 3 U124 MIC2954-02BS D135 UF4007 C177 2.2uF 5V VCAin 2 BUFout 3 AUDin + 4 Cavg 5 CRS 6 Vout 7 V+ 8 GND 1 U106 SSM2165-2P C107 1uF JP105 RX / CD C110 0.01uF R163 3.32k NOTES: 1. ALL RESISTANCE VALUES IN OHMS, UNLESS OTHERWISE SPECIFIED. JP101 1 2 3 EXT O/P POT JP102 1 2 3 INT O/P POT JP103 1 2 3 600 O/P 8 150 150 150 150 600 8 150 600 600 150 600 150 150 37 13.5 CD RX 1 2 3 R121 1k C178 0.047uF JP106 PA KEY 1-2 2-3 EXTERNAL VOL CONTROL DISABLED EXTERNAL VOL CONTROL ENABLED JP101 (EXT SPKR) JP102 (INT SPKR) JP103 (O/P IMPEDANCE) JP104 (PA OUTPUT LEVEL) 1-2 2-3 EXTERNAL VOL CONTROL ENABLED 0 - 0.5 Vrms O/P 1-2 EXTERNAL VOL CONTROL DISABLED 0 - 6.5 Vrms O/P INST 2-3 JP106 (PA KEY) JP105 (RX/CD) N/INST N/INST INST 8 OHM O/P IMPEDANCE MIC AUDIO ACTIVATED WITH PA KEY MIC AUDIO LIVE 2. JUMPER TABLE: 600 OHM O/P IMPEDANCE RX AUDIO INPUT ENABLED CD AUDIO INPUT ENABLED 1-2 2-3 D130 1N6288A 2 7 4 9 8 3 5 T105 600 600 2 7 4 9 8 3 5 T104 600 600 MIC PRE-AMP EXTERNAL MIC LEVEL SIDETONE LEVEL CW R126 200k CW R159 200k t RT101 10k t RT102 10k 12V R218 5.11k R219 5.11k C176 10 uF R212 10k C173 1 uF 12V R207 287 12V R210 5.11k R211 5.11k + C172 10 uF C169 1 uF R206 10k 12V C170 0.1 uF R220 1k R213 8.87k R214 1k C174 22 uF R216 10k R215 10k R209 22k R217 8.87k C175 0.1 uF C171 0.1 uF YELP WAIL R208 10k SIREN CW R221 500k CW R222 50k RT 8 RT 7 CT 6 CT 5 V+ 4 M OUT 3 W OUT 2 WAV ADJ 13 FSK IN 9 BYPASS 10 SYNC OUT 11 GND 12 WAV ADJ 14 SYM ADJ 15 SYM ADJ 16 AM IN 1 U123 XR-2206 RT 8 RT 7 CT 6 CT 5 V+ 4 M OUT 3 W OUT 2 WAV ADJ 13 FSK IN 9 BYPASS 10 SYNC OUT 11 GND 12 WAV ADJ 14 SYM ADJ 15 SYM ADJ 16 AM IN 1 U122 XR-2206 SWEEP GENERATOR TONE GENERATOR SINUSOIDAL RECEIVE DISABLE 25 +28VDC POWER 26 +28VDC SWITCHED RECEIVE DISABLE TP1 TO AA21-4x J401 REVISIONS REV DESCRIPTION DATE BY 1.10 ECR #1556 : F101 & F102 ADDED. U112, U120, U121 VAL CHANGE. JAN 3/00 SRK FL102 0.022uF L101 125uH F101 2.5A Vin 1 GND 2 Vout 3 U120 LM2940T-12 F102 0.5A 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3

REV. SHEET DWG. NO. DWG. TYPE FILE DESIGNED DRAWN DATE CHECKED APPROVED SIZE CAGE CODE PART NO. TITLE B 3AB01 PROPRIETARY AND CONFIDENTIAL TO NAT LTD. 13 MIC HI 25 MIC LO 1 6 3 4 2 5 T101 MET-31 10 PA KEY 8 SWITCHED POWER 21 SIDETONE LO R117 150 R116 330 C103 22uF C102 0.47uF C101 1000pF C104 1000pF R118 1k R119 1k C105 0.1uF C108 4.7uF R120 10k C106 1000pF 11 RECEIVE HI 23 RECEIVE LO 12 CD HI 24 CD LO 9 SIDETONE HI 22 +3dB 3 +28V LIGHTS 16 LIGHTS GROUND J101 25 PIN D-SUB PLUG 5V 8V + 2 - 4 5 1 3 6 8 U107 TDA7052AN 12V C111 0.22uF R125 4.7k C113 1uF R124 4.7k C112 1uF MIC AMP D118 MURS160T3 R160 220k + 2 - 4 5 1 3 6 8 U108 TDA7052AN 12V C125 0.22uF D120 MURS160T3 SIDE TONE AMP D119 MURS160T3 6 5 2 1 3 T102 R161 1k R162 9.09k R183 4.7k D117 MURS160T3 + 2 - 4 5 1 3 6 8 U114 TDA7052AN 12V R167 60.4 R171 220k C126 0.033uF R168 1k R172 22k C129 33uF R170 4.7k C128 1uF R169 4.7k C127 1uF RECEIVE AMP D113 MURS160T3 D122 MBRS140T3 8V A 1 C 2 NC 3 + 4 5 - 6 U118 LCA110 R185 2.2k 28V R184 330 D123 MURS160T3 R178 4.7k D115 MURS160T3 + 2 - 4 5 1 3 6 8 U115 TDA7052AN 12V R175 13.0k C131 0.22uF C133 1uF R177 4.7k C132 1uF C130 0.1uF R180 100k R176 10k D114 MURS160T3 Vref 1 SET hi 2 SET lo 3 GND 4 V+ 8 over 7 under 6 Vptat 5 U117 TMP01FP 12V R165 18.2k R166 75k C167 10uF C168 0.1uF D134 UF4007 8V Vin 3 GND 2 +8V 1 U121 78L08 D111 MURS160T3 D112 MURS160T3 FL102 0.022uF C161 330uF L101 125uH Q106 MJF122 D131 1N4742A D132 1N4742A R205 470 C162 100uF C163 0.1uF 22V C164 10uF C165 0.1uF 12V D133 UF4007 C166 10uF 28V D129 UF5407 C158 330uF C159 330uF C160 330uF Vin 1 GND 2 OUT 3 U120 LM340T-12 22V C123 330uF FL101 0.022uF 1 2 4 3 5 U109 TDA2040V R135 22k R136 680 C121 22uF C120 0.1uF C122 1uF R137 1 R131 22k R130 24.3k C115 0.1uF R132 22k 22V C116 22uF D107 UF4007 D108 UF4007 R129 10k R133 10k C114 0.1uF C117 2200pF C118 1000pF R134 10k 22V 1 2 4 3 5 U110 TDA2040V R143 22k R140 680 C139 22uF C138 0.1uF C135 0.1uF 28V R139 10k R141 10k C134 0.1uF C136 2200pF C137 1000pF R142 10k R149 22k C141 0.22uF R148 1 D109 UF4007 D110 UF4007 C140 1uF 28V R144 1.2 R145 1.2 R146 1.2 R147 1.2 C142 330uF C143 330uF 3 2 1 8 4 U112A LM358 R151 100k R150 100k R152 47.5k C144 0.01uF R153 100k C145 1000pF C146 2.2uF R154 10k D125 MURS160T3 C147 1uF R155 470k R157 15.0k R156 100k 12V 3 2 1 8 4 U111A LM2903 6V R158 100k 12V 12V 12V 1 2 4 3 5 U113 TDA2040V R188 20k R187 22k R189 22k 28V C148 22uF R190 22k 28V R192 22k C150 22uF R191 680 R197 1 C151 0.22uF D126 UF4007 D127 UF4007 28V C149 1000pF R193 1.2 R194 1.2 R195 1.2 R196 1.2 C152 330uF C153 330uF 12V 5 6 7 U112B LM358 R198 47.5k C154 0.01uF R199 100k C155 1000pF C156 2.2uF R200 10k D128 MURS160T3 C157 1uF R203 470k R202 15.0k R201 100k 5 6 7 U111B LM2903 6V R204 100k 6 EXT PA HI 19 EXT PA LO 20 SHIELD 1 +28VDC POWER 2 +28VDC POWER 14 POWER GROUND 15 POWER GROUND 7 SPEAKER A 5 SPEAKER B P/O J101 SRK MAD/SRK OCT 8/99 401-0100.SCH SCHEMATIC AA21-1A\401-0 1.00 1/1 AA21-1A MAIN SUBASSEMBLY LEVEL LEVEL SIREN AMP RECEIVE LEVEL SIREN LEVEL C119 330uF TEMPERATURE SENSOR D121 MURS160T3 A 1 C 2 NC 3 + 4 5 - 6 U116 LCA110 R164 2.2k 28V 12 N/C 11 N/C 17 POT HI 8 EXTERNAL SPKR 7 INTERNAL SPKR 13 POWER GROUND D105 MURS160T3 D106 MURS160T3 14 RESERVED 15 POT LO 1 +28VDC POWER 2 +28VDC POWER 3 +28VDC SWITCHED 4 +28VDC SWITCHED 16 POT WIPER 5 LIGHTS GROUND 6 28V LIGHTS R115 8.87k 28V R114 8.87k 28V R111 1k 10 PA 9 RADIO 5V R123 1k 17 SHIELD 18 SIREN KEY D124 MURS160T3 A 1 C 2 NC 3 + 4 5 - 6 U119 LCA110 R186 2.2k 28V R181 4.7k R182 22k 8V SIREN 18 WAIL RETURN 19 YELP RETURN 20 YELP ON 4 N/C 1 3 6 5 4 2 T103 R128 187 JP104 YELP/WAIL KEY P/O J102 J102 26 PIN STRIP PLUG P/O J102 R113 8.87k 28V 21 WAIL ON 22 POWER GROUND 23 RSVSP 24 RECEIVE DISABLE YELP/WAIL KEY CW R138 10k CW R127 10k CW R173 500k CW R179 500k A 1 C 2 A 3 NC 8 NC 7 NO 6 C 4 NO 5 U103 AQW614 A 1 C 2 A 3 NC 8 NC 7 NO 6 C 4 NO 5 U105 AQW614 A 1 C 2 A 3 NC 8 NC 7 NO 6 C 4 NO 5 U104 AQW614 R174 47k Q104 2N2222A Q103 2N2222A Q105 2N2222A INT SPKR EXT SPKR C124 10uF C109 0.33uF Vin 1 GND 2 +5V 3 U124 MIC2954-02BS D135 UF4007 C177 2.2uF 5V VCAin 2 BUFout 3 AUDin + 4 Cavg 5 CRS 6 Vout 7 V+ 8 GND 1 U106 SSM2165-2P C107 1uF JP105 RX / CD C110 0.01uF R163 3.32k NOTES: 1. ALL RESISTANCE VALUES IN OHMS, UNLESS OTHERWISE SPECIFIED. JP101 1 2 3 EXT O/P POT JP102 1 2 3 INT O/P POT JP103 1 2 3 600 O/P 8 150 150 150 150 600 8 150 600 600 150 600 150 150 37 13.5 CD RX 1 2 3 R121 1k C178 0.047uF JP106 PA KEY 1-2 2-3 EXTERNAL VOL CONTROL DISABLED EXTERNAL VOL CONTROL ENABLED JP101 (EXT SPKR) JP102 (INT SPKR) JP103 (O/P IMPEDANCE) JP104 (PA OUTPUT LEVEL) 1-2 2-3 EXTERNAL VOL CONTROL ENABLED 0 - 0.5 Vrms O/P 1-2 EXTERNAL VOL CONTROL DISABLED 0 - 6.5 Vrms O/P INST 2-3 JP106 (PA KEY) JP105 (RX/CD) N/INST N/INST INST 8 OHM O/P IMPEDANCE MIC AUDIO ACTIVATED WITH PA KEY MIC AUDIO LIVE 2. JUMPER TABLE: 600 OHM O/P IMPEDANCE RX AUDIO INPUT ENABLED CD AUDIO INPUT ENABLED 1-2 2-3 D130 1N6288A 2 7 4 9 8 3 5 T105 600 600 2 7 4 9 8 3 5 T104 600 600 MIC PRE-AMP EXTERNAL MIC LEVEL SIDETONE LEVEL CW R126 200k CW R159 200k t RT101 10k t RT102 10k 12V R218 5.11k R219 5.11k C176 10 uF R212 10k C173 1 uF 12V R207 287 12V R210 5.11k R211 5.11k + C172 10 uF C169 1 uF R206 10k 12V C170 0.1 uF R220 1k R213 8.87k R214 1k C174 22 uF R216 10k R215 10k R209 22k R217 8.87k C175 0.1 uF C171 0.1 uF YELP WAIL R208 10k SIREN CW R221 500k CW R222 50k RT 8 RT 7 CT 6 CT 5 V+ 4 M OUT 3 W OUT 2 WAV ADJ 13 FSK IN 9 BYPASS 10 SYNC OUT 11 GND 12 WAV ADJ 14 SYM ADJ 15 SYM ADJ 16 AM IN 1 U123 XR-2206 RT 8 RT 7 CT 6 CT 5 V+ 4 M OUT 3 W OUT 2 WAV ADJ 13 FSK IN 9 BYPASS 10 SYNC OUT 11 GND 12 WAV ADJ 14 SYM ADJ 15 SYM ADJ 16 AM IN 1 U122 XR-2206 SWEEP GENERATOR TONE GENERATOR SINUSOIDAL RECEIVE DISABLE 25 +28VDC POWER 26 +28VDC SWITCHED RECEIVE DISABLE TP1 TO AA21-4x J401

Description: Document#: Rev: AA21-1A AA21-1A\701-0 Main Subassembly 1.10 Prepared By: Checked By: Approved By: IDENT DESCRIPTION OR VALUE QTY. PACKAGE NAT P/N MFR. P/N CAPACITORS C101 SM, Ceramic, 50 V 1000 pF 1206 11-05-102 8 C102 Metalized Polycarbonate, 50 V 0.47 uF CK07 10-64-474 1 C103 Tantalum Dipped, 35 V 22 uF T352/6 10-18-226 6 C104 SM, Ceramic, 50 V 1000 pF 1206 11-05-102 C105 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 14 C106 SM, Ceramic, 50 V 1000 pF 1206 11-05-102 C107 SM, Tantalum Molded, 35 V 1 uF 3528 11-53-105 5 C108 SM, Tantalum Molded, 20 V 4.7 uF 3528 11-52-475 1 C109 SM, Ceramic, 16 V 0.33 uF 1206 11-03-334 1 C110 SM, Ceramic, 100 V 0.01 uF 1206 11-06-103 3 C111 Ceramic Molded, 50 V 0.22 uF CK06 10-11-224 5 C112 Ceramic Molded, 50 V 1.0 uF CK06 10-11-105 8 C113 Ceramic Molded, 50 V 1.0 uF CK06 10-11-105 C114 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C115 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C116 Tantalum Dipped, 35 V 22 uF T352/6 10-18-226 C117 SM, Ceramic, 50 V 2200 pF 1206 11-05-222 2 C118 SM, Ceramic, 50 V 1000 pF 1206 11-05-102 C119 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 10 C120 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C121 Tantalum Dipped, 35 V 22 uF T352/6 10-18-226 C122 Ceramic Molded, 50 V 1.0 uF CK06 10-11-105 C123 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 C124 Tantalum Dipped, 35 V 10 uF T352 10-18-106 4 C125 Ceramic Molded, 50 V 0.22 uF CK06 10-11-224 C126 Metalized Polycarbonate, 50 V 0.033 uF CK05 10-64-333 1 C127 Ceramic Molded, 50 V 1.0 uF CK06 10-11-105 C128 Ceramic Molded, 50 V 1.0 uF CK06 10-11-105 C129 Tantalum Dipped, 16 V 33 uF T352 10-16-336 1 C130 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C131 Ceramic Molded, 50 V 0.22 uF CK06 10-11-224 C132 Ceramic Molded, 50 V 1.0 uF CK06 10-11-105 C133 Ceramic Molded, 50 V 1.0 uF CK06 10-11-105 C134 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C135 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C136 SM, Ceramic, 50 V 2200 pF 1206 11-05-222 C137 SM, Ceramic, 50 V 1000 pF 1206 11-05-102 C138 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C139 Tantalum Dipped, 35 V 22 uF T352/6 10-18-226 C140 Ceramic Molded, 50 V 1.0 uF CK06 10-11-105 C141 Ceramic Molded, 50 V 0.22 uF CK06 10-11-224 Page: 1 of 7 Dec 8, 1999 Rev: 1.10 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

C142 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 C143 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 C144 SM, Ceramic, 100 V 0.01 uF 1206 11-06-103 C145 SM, Ceramic, 50 V 1000 pF 1206 11-05-102 C146 SM, Tantalum Molded, 20 V 2.2 uF 3528 11-52-225 3 C147 SM, Tantalum Molded, 35 V 1 uF 3528 11-53-105 C148 Tantalum Dipped, 35 V 22 uF T352/6 10-18-226 C149 SM, Ceramic, 50 V 1000 pF 1206 11-05-102 C150 Tantalum Dipped, 35 V 22 uF T352/6 10-18-226 C151 Ceramic Molded, 50 V 0.22 uF CK06 10-11-224 C152 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 C153 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 C154 SM, Ceramic, 100 V 0.01 uF 1206 11-06-103 C155 SM, Ceramic, 50 V 1000 pF 1206 11-05-102 C156 SM, Tantalum Molded, 20 V 2.2 uF 3528 11-52-225 C157 SM, Tantalum Molded, 35 V 1 uF 3528 11-53-105 C158 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 C159 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 C160 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 C161 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 C162 Aluminum Electrolytic, 35 V 100 uF 1V 10-34-107 1 C163 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C164 Tantalum Dipped, 35 V 10 uF T352 10-18-106 C165 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C166 Tantalum Dipped, 35 V 10 uF T352 10-18-106 C167 Tantalum Dipped, 35 V 10 uF T352 10-18-106 C168 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C169 SM, Tantalum Molded, 35 V 1 uF 3528 11-53-105 C170 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C171 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C172 SM, Tantalum Molded, 16 V 10 uF 3528 11-49-106 2 C173 SM, Tantalum Molded, 35 V 1 uF 3528 11-53-105 C174 SM, Tantalum Molded, 16 V 22 uF 6032 11-51-226 1 C175 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C176 SM, Tantalum Molded, 16 V 10 uF 3528 11-49-106 C177 SM, Tantalum Molded, 20 V 2.2 uF 3528 11-52-225 C178 SM, Ceramic, 50 V 0.047 uF 1206 11-05-473 1 DIODES D101 - D104 NOT INSTALLED N/A D105 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 16 D106 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D107 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 9 D108 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 D109 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 D110 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 D111 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D112 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D113 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D114 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D115 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D116 NOT INSTALLED N/A D117 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 Page: 2 of 7 Dec 8, 1999 Rev: 1.10 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

D118 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D119 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D120 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D121 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D122 SM, Rectifier Schottky, 40 V, 1.0 A MBRS140T3 SMB 74-30-140 1 D123 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D124 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D125 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D126 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 D127 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 D128 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D129 Rectifier, 3 A, 800 V UF5407 DO-201 75-21-407 1 D130 Transzorb, 5 W, 51 V 1N6288A DO-201 75-50-288 1 D131 Zener, 1 W, 12 V 1N4742A DO-41 75-12-042 2 D132 Zener, 1 W, 12 V 1N4742A DO-41 75-12-042 D133 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 D134 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 D135 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 D136 NOT ISSUED N/A FUSES F101 Fuse, Subminiature, Fast 2.5 Amp 23-10-025 1 F102 Fuse, Subminiature, Fast 0.5 Amp 23-10-005 1 FILTERS FL101 T Network, 50 V 0.022 uF 22-10-223 2 FL102 T Network, 50 V 0.022 uF 22-10-223 CONNECTORS J101 D-sub Plug, 90 Deg., PC Mnt, Filtered 25 Pin 20-14-725F 1 J102 Strip Plug, Dbl Row Straight, PC Mnt 26 Pin 20-00-026L 1 JUMPERS JP101 Wire Jumper, 22 AWG NSN 4 JP102 Wire Jumper, 22 AWG NSN JP103 Wire Jumper, 22 AWG NSN JP104 Strip Plug, Sgl Row Straight, PC Mnt 2 Pin 20-03-002 1 JP105 Strip Plug, Sgl Row Straight, PC Mnt 3 Pin 20-03-003 1 JP106 Wire Jumper, 22 AWG NSN INDUCTORS L101 Choke, Medium Power, Shielded 125 uH 35-00-537S 1 TRANSISTORS Q101 NOT INSTALLED N/A Q102 NOT INSTALLED N/A Q103 Bi-polar, Small Signal, NPN 2N2222A TO-18 77-00-222 3 Q104 Bi-polar, Small Signal, NPN 2N2222A TO-18 77-00-222 Q105 Bi-polar, Small Signal, NPN 2N2222A TO-18 77-00-222 Q106 Bi-polar, Power, NPN Darlington MJF-122 TO-220 77-19-122 1 Page: 3 of 7 Dec 8, 1999 Rev: 1.10 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

RESISTORS R101 - R110 NOT INSTALLED N/A R111 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 9 R112 NOT INSTALLED N/A R113 SM, Metal Film, 1/8 W, 1% 8.87 kOhm 1206 70-54-8873 5 R114 SM, Metal Film, 1/8 W, 1% 8.87 kOhm 1206 70-54-8873 R115 SM, Metal Film, 1/8 W, 1% 8.87 kOhm 1206 70-54-8873 R116 SM, Carbon Film, 1/8 W, 5% 330 Ohm 1206 70-50-332 1 R117 SM, Carbon Film, 1/8 W, 5% 150 Ohm 1206 70-50-152 1 R118 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 R119 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 R120 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 15 R121 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 R122 NOT ISSUED N/A R123 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 R124 SM, Carbon Film, 1/8 W, 5% 4.7 kOhm 1206 70-50-473 8 R125 SM, Carbon Film, 1/8 W, 5% 4.7 kOhm 1206 70-50-473 R126 Trim Pot, Vert., Top Adj. 200 kOhm 3329H 60-49-205 2 R127 Trim Pot, Vert., Top Adj. 10 kOhm 3329H 60-49-104 2 R128 SM, Metal Film, 1/8 W, 1% 187 Ohm 1206 70-54-1872 1 R129 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R130 SM, Metal Film, 1/8 W, 1% 24.3 kOhm 1206 70-54-2434 1 R131 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 12 R132 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R133 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R134 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R135 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R136 SM, Carbon Film, 1/8 W, 5% 680 Ohm 1206 70-50-682 3 R137 Carbon Film, 1/4 W, 5% 1.0 Ohm RC05 70-01-100 3 R138 Trim Pot, Vert., Top Adj. 10 kOhm 3329H 60-49-104 R139 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R140 SM, Carbon Film, 1/8 W, 5% 680 Ohm 1206 70-50-682 R141 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R142 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R143 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R144 Metal Film, 1/4 W, 1% 1.2 Ohm RC05 70-21-120 8 R145 Metal Film, 1/4 W, 1% 1.2 Ohm RC05 70-21-120 R146 Metal Film, 1/4 W, 1% 1.2 Ohm RC05 70-21-120 R147 Metal Film, 1/4 W, 1% 1.2 Ohm RC05 70-21-120 R148 Carbon Film, 1/4 W, 5% 1.0 Ohm RC05 70-01-100 R149 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R150 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 9 R151 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 R152 SM, Metal Film, 1/8 W, 1% 47.5 kOhm 1206 70-54-4754 2 R153 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 R154 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R155 SM, Carbon Film, 1/8 W, 5% 470 kOhm 1206 70-50-475 2 R156 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 R157 SM, Metal Film, 1/8 W, 1% 15.0 kOhm 1206 70-54-1501 2 R158 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 R159 Trim Pot, Vert., Top Adj. 200 kOhm 3329H 60-49-205 R160 SM, Carbon Film, 1/8 W, 5% 220 kOhm 1206 70-50-225 2 Page: 4 of 7 Dec 8, 1999 Rev: 1.10 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

R161 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 R162 SM, Metal Film, 1/8 W, 1% 9.09 kOhm 1206 70-54-9093 1 R163 SM, Metal Film, 1/8 W, 1% 3.32 kOhm 1206 70-54-3323 1 R164 SM, Carbon Film, 1/2 W, 5% 2.2 kOhm 2010 70-52-223 3 R165 SM, Metal Film, 1/8 W, 1% 18.2 kOhm 1206 70-54-1824 1 R166 SM, Metal Film, 1/8 W, 1% 75.0 kOhm 1206 70-54-7504 1 R167 SM, Metal Film, 1/8 W, 1% 60.4 Ohm 1206 70-54-6049 1 R168 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 R169 SM, Carbon Film, 1/8 W, 5% 4.7 kOhm 1206 70-50-473 R170 SM, Carbon Film, 1/8 W, 5% 4.7 kOhm 1206 70-50-473 R171 SM, Carbon Film, 1/8 W, 5% 220 kOhm 1206 70-50-225 R172 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R173 Trim Pot, Vert., Top Adj. 500 kOhm 3329H 60-49-505 3 R174 SM, Carbon Film, 1/8 W, 5% 47 kOhm 1206 70-50-474 1 R175 SM, Metal Film, 1/8 W, 1% 13.0 kOhm 1206 70-54-1304 1 R176 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R177 SM, Carbon Film, 1/8 W, 5% 4.7 kOhm 1206 70-50-473 R178 SM, Carbon Film, 1/8 W, 5% 4.7 kOhm 1206 70-50-473 R179 Trim Pot, Vert., Top Adj. 500 kOhm 3329H 60-49-505 R180 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 R181 SM, Carbon Film, 1/8 W, 5% 4.7 kOhm 1206 70-50-473 R182 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R183 SM, Carbon Film, 1/8 W, 5% 4.7 kOhm 1206 70-50-473 R184 Carbon Film, 1/4 W, 5% 330 Ohm RC05 70-01-332 1 R185 SM, Carbon Film, 1/2 W, 5% 2.2 kOhm 2010 70-52-223 R186 SM, Carbon Film, 1/2 W, 5% 2.2 kOhm 2010 70-52-223 R187 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R188 Metal Film, 1/4 W, 1% 20 kOhm RC05 70-21-2002 1 R189 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R190 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R191 SM, Carbon Film, 1/8 W, 5% 680 Ohm 1206 70-50-682 R192 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R193 Metal Film, 1/4 W, 1% 1.2 Ohm RC05 70-21-120 R194 Metal Film, 1/4 W, 1% 1.2 Ohm RC05 70-21-120 R195 Metal Film, 1/4 W, 1% 1.2 Ohm RC05 70-21-120 R196 Metal Film, 1/4 W, 1% 1.2 Ohm RC05 70-21-120 R197 Carbon Film, 1/4 W, 5% 1.0 Ohm RC05 70-01-100 R198 SM, Metal Film, 1/8 W, 1% 47.5 kOhm 1206 70-54-4754 R199 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 R200 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R201 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 R202 SM, Metal Film, 1/8 W, 1% 15.0 kOhm 1206 70-54-1501 R203 SM, Carbon Film, 1/8 W, 5% 470 kOhm 1206 70-50-475 R204 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 R205 Carbon Film, 1/4 W, 5% 470 Ohm RC05 70-01-472 1 R206 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R207 SM, Metal Film, 1/8 W, 1% 287 Ohm 1206 70-54-2872 1 R208 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R209 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R210 SM, Metal Film, 1/8 W, 1% 5.11 kOhm 1206 70-54-5113 4 R211 SM, Metal Film, 1/8 W, 1% 5.11 kOhm 1206 70-54-5113 R212 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 Page: 5 of 7 Dec 8, 1999 Rev: 1.10 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

R213 SM, Metal Film, 1/8 W, 1% 8.87 kOhm 1206 70-54-8873 R214 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 R215 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R216 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R217 SM, Metal Film, 1/8 W, 1% 8.87 kOhm 1206 70-54-8873 R218 SM, Metal Film, 1/8 W, 1% 5.11 kOhm 1206 70-54-5113 R219 SM, Metal Film, 1/8 W, 1% 5.11 kOhm 1206 70-54-5113 R220 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 R221 Trim Pot, Vert., Top Adj. 500 kOhm 3329H 60-49-505 R222 Trim Pot, Vertical, Top Adj. 50 kOhm 3329H 60-49-504 1 R223 NOT INSTALLED N/A RT101 Thermistor, NTC 10 kOhm 70-40-103 2 RT102 Thermistor, NTC 10 kOhm 70-40-103 TRANSFORMERS T101 Audio, PC Mount MET-31 35-10-031 1 T102 Audio, PC Mount 35-10-009 1 T103 Audio, PC Mount 35-10-050 1 T104 Audio, PC Mount 35-10-600 2 T105 Audio, PC Mount 35-10-600 INTEGRATED CIRCUITS U101 NOT INSTALLED N/A U102 NOT INSTALLED N/A U103 Optical Mosfet Relay AQW614 DIP8 65-30-614 3 U104 Optical Mosfet Relay AQW614 DIP8 65-30-614 U105 Optical Mosfet Relay AQW614 DIP8 65-30-614 U106 Mic Amplifier, Audio SSM2165-2P DIP8 32-43-2165 1 U107 Power Amplifier, Audio TDA7052AN DIP8 32-40-052 4 U108 Power Amplifier, Audio TDA7052AN DIP8 32-40-052 U109 Power Amplifier, Audio TDA2040V TO-220-5 32-40-204 3 U110 Power Amplifier, Audio TDA2040V TO-220-5 32-40-204 U111 Comparator, Dual LM2903 DIP8 32-25-290 1 U112 Op Amp, Dual LM2904N DIP8 32-02-904 1 U113 Power Amplifier, Audio TDA2040V TO-220-5 32-40-204 U114 Power Amplifier, Audio TDA7052AN DIP8 32-40-052 U115 Power Amplifier, Audio TDA7052AN DIP8 32-40-052 U116 Optical Mosfet LCA110 DIP6 65-30-110 3 U117 Temperature Controller, Analog TMP01FP DIP8 32-62-001 1 U118 Optical Mosfet LCA110 DIP6 65-30-110 U119 Optical Mosfet LCA110 DIP6 65-30-110 U120 Regulator, Low Dropout, +12V LM2940T-12 TO-220 32-12-294 1 U121 Fixed Voltage Regulator, +8 VDC MC78L08ABP TO-92 32-12-108 1 U122 Function Generator XR-2206 DIP16 32-55-206 2 U123 Function Generator XR-2206 DIP16 32-55-206 U124 SM, Regulator, Fixed +5V MIC2954-02BS SOT-223 34-23-005 1 Page: 6 of 7 Dec 8, 1999 Rev: 1.10 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

MECHANICAL PARTS M101 PCB, AA21 Main Rev 1.30 15-21-001 1 M102 Socket, Tin Crimp Lead DIP6 80-00-006 3 M103 Socket, Tin Crimp Lead DIP8 80-00-008 11 M104 Shield, uMetal 35-10-099 1 M105 Screw, Panhead, Phillips, Steel MS35206-214 4-40, 0.32" 25-10-214 7 M106 Nut, Nylon Locking, Steel MS21044-N04 4-40, 0.15" 25-02-440 2 M107 Insulator, 4 Pin TO-18/4 27-99-018 3 M108 Insulator TO-220-5 15-99-2205 3 M109 Shorting Block 2 Pin 20-48-100 2 M110 Heatsink, AA20-431 50-20-020 2 M111 Socket, Tin Crimp Lead DIP16 80-00-016 2 M112 Socket, Single Pin, Round Lead SIP 1 80-30-016 4 End of Parts List Generated by Parts List Manager Ver: 2.7 Page: 7 of 7 Dec 8, 1999 Rev: 1.10 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

Description: Document#: Rev: AA21-1A AA21-1A\701-0 Main Subassembly 1.00 Prepared By: Checked By: Approved By: IDENT DESCRIPTION OR VALUE QTY. PACKAGE NAT P/N MFR. P/N CAPACITORS C101 SM, Ceramic, 50 V 1000 pF 1206 11-05-102 8 C102 Metalized Polycarbonate, 50 V 0.47 uF CK07 10-64-474 1 C103 Tantalum Dipped, 35 V 22 uF T352/6 10-18-226 6 C104 SM, Ceramic, 50 V 1000 pF 1206 11-05-102 C105 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 14 C106 SM, Ceramic, 50 V 1000 pF 1206 11-05-102 C107 SM, Tantalum Molded, 35 V 1 uF 3528 11-53-105 5 C108 SM, Tantalum Molded, 20 V 4.7 uF 3528 11-52-475 1 C109 SM, Ceramic, 16 V 0.33 uF 1206 11-03-334 1 C110 SM, Ceramic, 100 V 0.01 uF 1206 11-06-103 3 C111 Ceramic Molded, 50 V 0.22 uF CK06 10-11-224 5 C112 Ceramic Molded, 50 V 1.0 uF CK06 10-11-105 8 C113 Ceramic Molded, 50 V 1.0 uF CK06 10-11-105 C114 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C115 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C116 Tantalum Dipped, 35 V 22 uF T352/6 10-18-226 C117 SM, Ceramic, 50 V 2200 pF 1206 11-05-222 2 C118 SM, Ceramic, 50 V 1000 pF 1206 11-05-102 C119 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 10 C120 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C121 Tantalum Dipped, 35 V 22 uF T352/6 10-18-226 C122 Ceramic Molded, 50 V 1.0 uF CK06 10-11-105 C123 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 C124 Tantalum Dipped, 35 V 10 uF T352 10-18-106 4 C125 Ceramic Molded, 50 V 0.22 uF CK06 10-11-224 C126 Metalized Polycarbonate, 50 V 0.033 uF CK05 10-64-333 1 C127 Ceramic Molded, 50 V 1.0 uF CK06 10-11-105 C128 Ceramic Molded, 50 V 1.0 uF CK06 10-11-105 C129 Tantalum Dipped, 16 V 33 uF T352 10-16-336 1 C130 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C131 Ceramic Molded, 50 V 0.22 uF CK06 10-11-224 C132 Ceramic Molded, 50 V 1.0 uF CK06 10-11-105 C133 Ceramic Molded, 50 V 1.0 uF CK06 10-11-105 C134 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C135 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C136 SM, Ceramic, 50 V 2200 pF 1206 11-05-222 C137 SM, Ceramic, 50 V 1000 pF 1206 11-05-102 C138 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C139 Tantalum Dipped, 35 V 22 uF T352/6 10-18-226 C140 Ceramic Molded, 50 V 1.0 uF CK06 10-11-105 C141 Ceramic Molded, 50 V 0.22 uF CK06 10-11-224 C142 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 Page: 1 of 6 Oct 8, 1999 Rev: 1.00 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

C143 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 C144 SM, Ceramic, 100 V 0.01 uF 1206 11-06-103 C145 SM, Ceramic, 50 V 1000 pF 1206 11-05-102 C146 SM, Tantalum Molded, 20 V 2.2 uF 3528 11-52-225 3 C147 SM, Tantalum Molded, 35 V 1 uF 3528 11-53-105 C148 Tantalum Dipped, 35 V 22 uF T352/6 10-18-226 C149 SM, Ceramic, 50 V 1000 pF 1206 11-05-102 C150 Tantalum Dipped, 35 V 22 uF T352/6 10-18-226 C151 Ceramic Molded, 50 V 0.22 uF CK06 10-11-224 C152 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 C153 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 C154 SM, Ceramic, 100 V 0.01 uF 1206 11-06-103 C155 SM, Ceramic, 50 V 1000 pF 1206 11-05-102 C156 SM, Tantalum Molded, 20 V 2.2 uF 3528 11-52-225 C157 SM, Tantalum Molded, 35 V 1 uF 3528 11-53-105 C158 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 C159 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 C160 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 C161 Aluminum Electrolytic, 35 V 330 uF 1V 10-34-337 C162 Aluminum Electrolytic, 35 V 100 uF 1V 10-34-107 1 C163 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C164 Tantalum Dipped, 35 V 10 uF T352 10-18-106 C165 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C166 Tantalum Dipped, 35 V 10 uF T352 10-18-106 C167 Tantalum Dipped, 35 V 10 uF T352 10-18-106 C168 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C169 SM, Tantalum Molded, 35 V 1 uF 3528 11-53-105 C170 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C171 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C172 SM, Tantalum Molded, 16 V 10 uF 3528 11-49-106 2 C173 SM, Tantalum Molded, 35 V 1 uF 3528 11-53-105 C174 SM, Tantalum Molded, 16 V 22 uF 6032 11-51-226 1 C175 SM, Ceramic, 50 V 0.1 uF 1206 11-05-104 C176 SM, Tantalum Molded, 16 V 10 uF 3528 11-49-106 C177 SM, Tantalum Molded, 20 V 2.2 uF 3528 11-52-225 C178 SM, Ceramic, 50 V 0.047 uF 1206 11-05-473 1 DIODES D101 - D104 NOT INSTALLED N/A D105 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 16 D106 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D107 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 9 D108 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 D109 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 D110 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 D111 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D112 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D113 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D114 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D115 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D116 NOT INSTALLED N/A D117 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D118 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D119 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 Page: 2 of 6 Oct 8, 1999 Rev: 1.00 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

D120 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D121 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D122 SM, Rectifier Schottky, 40 V, 1.0 A MBRS140T3 SMB 74-30-140 1 D123 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D124 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D125 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D126 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 D127 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 D128 SM, Power Rectifier, 1A, 600 V MURS160T3 SMB 74-21-160 D129 Rectifier, 3 A, 800 V UF5407 DO-201 75-21-407 1 D130 Transzorb, 5 W, 51 V 1N6288A DO-201 75-50-288 1 D131 Zener, 1 W, 12 V 1N4742A DO-41 75-12-042 2 D132 Zener, 1 W, 12 V 1N4742A DO-41 75-12-042 D133 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 D134 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 D135 Rectifier, 1 A, 1000 V UF4007 DO-41 75-20-007 D136 NOT INSTALLED N/A FILTERS FL101 T Network, 50 V 0.022 uF 22-10-223 2 FL102 T Network, 50 V 0.022 uF 22-10-223 CONNECTORS J101 D-sub Plug, 90 Deg., PC Mnt, Filtered 25 Pin 20-14-725F 1 J102 Strip Plug, Dbl Row Straight, PC Mnt 26 Pin 20-00-026L 1 JUMPERS JP101 Wire Jumper, 22 AWG NSN 4 JP102 Wire Jumper, 22 AWG NSN JP103 Wire Jumper, 22 AWG NSN JP104 Strip Plug, Sgl Row Straight, PC Mnt 2 Pin 20-03-002 1 JP105 Strip Plug, Sgl Row Straight, PC Mnt 3 Pin 20-03-003 1 JP106 Wire Jumper, 22 AWG NSN INDUCTORS L101 Choke, Medium Power, Shielded 125 uH 35-00-537S 1 TRANSISTORS Q101 NOT INSTALLED N/A Q102 NOT INSTALLED N/A Q103 Bi-polar, Small Signal, NPN 2N2222A TO-18 77-00-222 3 Q104 Bi-polar, Small Signal, NPN 2N2222A TO-18 77-00-222 Q105 Bi-polar, Small Signal, NPN 2N2222A TO-18 77-00-222 Q106 Bi-polar, Power, NPN Darlington MJF-122 TO-220 77-19-122 1 RESISTORS R101 - R110 NOT INSTALLED N/A R111 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 9 R112 NOT INSTALLED N/A R113 SM, Metal Film, 1/8 W, 1% 8.87 kOhm 1206 70-54-8873 5 R114 SM, Metal Film, 1/8 W, 1% 8.87 kOhm 1206 70-54-8873 R115 SM, Metal Film, 1/8 W, 1% 8.87 kOhm 1206 70-54-8873 R116 SM, Carbon Film, 1/8 W, 5% 330 Ohm 1206 70-50-332 1 R117 SM, Carbon Film, 1/8 W, 5% 150 Ohm 1206 70-50-152 1 R118 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 R119 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 Page: 3 of 6 Oct 8, 1999 Rev: 1.00 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

R120 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 15 R121 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 R122 NOT ISSUED N/A R123 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 R124 SM, Carbon Film, 1/8 W, 5% 4.7 kOhm 1206 70-50-473 8 R125 SM, Carbon Film, 1/8 W, 5% 4.7 kOhm 1206 70-50-473 R126 Trim Pot, Vert., Top Adj. 200 kOhm 3329H 60-49-205 2 R127 Trim Pot, Vert., Top Adj. 10 kOhm 3329H 60-49-104 2 R128 SM, Metal Film, 1/8 W, 1% 187 Ohm 1206 70-54-1872 1 R129 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R130 SM, Metal Film, 1/8 W, 1% 24.3 kOhm 1206 70-54-2434 1 R131 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 12 R132 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R133 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R134 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R135 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R136 SM, Carbon Film, 1/8 W, 5% 680 Ohm 1206 70-50-682 3 R137 Carbon Film, 1/4 W, 5% 1.0 Ohm RC05 70-01-100 3 R138 Trim Pot, Vert., Top Adj. 10 kOhm 3329H 60-49-104 R139 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R140 SM, Carbon Film, 1/8 W, 5% 680 Ohm 1206 70-50-682 R141 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R142 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R143 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R144 Metal Film, 1/4 W, 1% 1.2 Ohm RC05 70-21-120 8 R145 Metal Film, 1/4 W, 1% 1.2 Ohm RC05 70-21-120 R146 Metal Film, 1/4 W, 1% 1.2 Ohm RC05 70-21-120 R147 Metal Film, 1/4 W, 1% 1.2 Ohm RC05 70-21-120 R148 Carbon Film, 1/4 W, 5% 1.0 Ohm RC05 70-01-100 R149 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R150 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 9 R151 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 R152 SM, Metal Film, 1/8 W, 1% 47.5 kOhm 1206 70-54-4754 2 R153 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 R154 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R155 SM, Carbon Film, 1/8 W, 5% 470 kOhm 1206 70-50-475 2 R156 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 R157 SM, Metal Film, 1/8 W, 1% 15.0 kOhm 1206 70-54-1501 2 R158 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 R159 Trim Pot, Vert., Top Adj. 200 kOhm 3329H 60-49-205 R160 SM, Carbon Film, 1/8 W, 5% 220 kOhm 1206 70-50-225 2 R161 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 R162 SM, Metal Film, 1/8 W, 1% 9.09 kOhm 1206 70-54-9093 1 R163 SM, Metal Film, 1/8 W, 1% 3.32 kOhm 1206 70-54-3323 1 R164 SM, Carbon Film, 1/2 W, 5% 2.2 kOhm 2010 70-52-223 3 R165 SM, Metal Film, 1/8 W, 1% 18.2 kOhm 1206 70-54-1824 1 R166 SM, Metal Film, 1/8 W, 1% 75.0 kOhm 1206 70-54-7504 1 R167 SM, Metal Film, 1/8 W, 1% 60.4 Ohm 1206 70-54-6049 1 R168 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 R169 SM, Carbon Film, 1/8 W, 5% 4.7 kOhm 1206 70-50-473 R170 SM, Carbon Film, 1/8 W, 5% 4.7 kOhm 1206 70-50-473 R171 SM, Carbon Film, 1/8 W, 5% 220 kOhm 1206 70-50-225 R172 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 Page: 4 of 6 Oct 8, 1999 Rev: 1.00 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

R173 Trim Pot, Vert., Top Adj. 500 kOhm 3329H 60-49-505 3 R174 SM, Carbon Film, 1/8 W, 5% 47 kOhm 1206 70-50-474 1 R175 SM, Metal Film, 1/8 W, 1% 13.0 kOhm 1206 70-54-1304 1 R176 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R177 SM, Carbon Film, 1/8 W, 5% 4.7 kOhm 1206 70-50-473 R178 SM, Carbon Film, 1/8 W, 5% 4.7 kOhm 1206 70-50-473 R179 Trim Pot, Vert., Top Adj. 500 kOhm 3329H 60-49-505 R180 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 R181 SM, Carbon Film, 1/8 W, 5% 4.7 kOhm 1206 70-50-473 R182 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R183 SM, Carbon Film, 1/8 W, 5% 4.7 kOhm 1206 70-50-473 R184 Carbon Film, 1/4 W, 5% 330 Ohm RC05 70-01-332 1 R185 SM, Carbon Film, 1/2 W, 5% 2.2 kOhm 2010 70-52-223 R186 SM, Carbon Film, 1/2 W, 5% 2.2 kOhm 2010 70-52-223 R187 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R188 Metal Film, 1/4 W, 1% 20 kOhm RC05 70-21-2002 1 R189 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R190 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R191 SM, Carbon Film, 1/8 W, 5% 680 Ohm 1206 70-50-682 R192 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R193 Metal Film, 1/4 W, 1% 1.2 Ohm RC05 70-21-120 R194 Metal Film, 1/4 W, 1% 1.2 Ohm RC05 70-21-120 R195 Metal Film, 1/4 W, 1% 1.2 Ohm RC05 70-21-120 R196 Metal Film, 1/4 W, 1% 1.2 Ohm RC05 70-21-120 R197 Carbon Film, 1/4 W, 5% 1.0 Ohm RC05 70-01-100 R198 SM, Metal Film, 1/8 W, 1% 47.5 kOhm 1206 70-54-4754 R199 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 R200 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R201 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 R202 SM, Metal Film, 1/8 W, 1% 15.0 kOhm 1206 70-54-1501 R203 SM, Carbon Film, 1/8 W, 5% 470 kOhm 1206 70-50-475 R204 SM, Metal Film, 1/8 W, 1% 100 kOhm 1206 70-54-1005 R205 Carbon Film, 1/4 W, 5% 470 Ohm RC05 70-01-472 1 R206 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R207 SM, Metal Film, 1/8 W, 1% 287 Ohm 1206 70-54-2872 1 R208 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R209 SM, Carbon Film, 1/8 W, 5% 22 kOhm 1206 70-50-224 R210 SM, Metal Film, 1/8 W, 1% 5.11 kOhm 1206 70-54-5113 4 R211 SM, Metal Film, 1/8 W, 1% 5.11 kOhm 1206 70-54-5113 R212 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R213 SM, Metal Film, 1/8 W, 1% 8.87 kOhm 1206 70-54-8873 R214 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 R215 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R216 SM, Metal Film, 1/8 W, 1% 10.0 kOhm 1206 70-54-104 R217 SM, Metal Film, 1/8 W, 1% 8.87 kOhm 1206 70-54-8873 R218 SM, Metal Film, 1/8 W, 1% 5.11 kOhm 1206 70-54-5113 R219 SM, Metal Film, 1/8 W, 1% 5.11 kOhm 1206 70-54-5113 R220 SM, Metal Film, 1/8 W, 1% 1.00 kOhm 1206 70-54-1003 R221 Trim Pot, Vert., Top Adj. 500 kOhm 3329H 60-49-505 R222 Trim Pot, Vertical, Top Adj. 50 kOhm 3329H 60-49-504 1 R223 NOT INSTALLED N/A RT101 Thermistor, NTC 10 kOhm 70-40-103 2 RT102 Thermistor, NTC 10 kOhm 70-40-103 Page: 5 of 6 Oct 8, 1999 Rev: 1.00 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

TRANSFORMERS T101 Audio, PC Mount MET-31 35-10-031 1 T102 Audio, PC Mount 35-10-009 1 T103 Audio, PC Mount 35-10-050 1 T104 Audio, PC Mount 35-10-600 2 T105 Audio, PC Mount 35-10-600 INTEGRATED CIRCUITS U101 NOT INSTALLED N/A U102 NOT INSTALLED N/A U103 Optical Mosfet Relay AQW614 DIP8 65-30-614 3 U104 Optical Mosfet Relay AQW614 DIP8 65-30-614 U105 Optical Mosfet Relay AQW614 DIP8 65-30-614 U106 Mic Amplifier, Audio SSM2165-2P DIP8 32-43-2165 1 U107 Power Amplifier, Audio TDA7052AN DIP8 32-40-052 4 U108 Power Amplifier, Audio TDA7052AN DIP8 32-40-052 U109 Power Amplifier, Audio TDA2040V TO-220-5 32-40-204 3 U110 Power Amplifier, Audio TDA2040V TO-220-5 32-40-204 U111 Comparator, Dual LM2903 DIP8 32-25-290 1 U112 Op Amp, Dual LM358 DIP8 32-01-358 1 U113 Power Amplifier, Audio TDA2040V TO-220-5 32-40-204 U114 Power Amplifier, Audio TDA7052AN DIP8 32-40-052 U115 Power Amplifier, Audio TDA7052AN DIP8 32-40-052 U116 Optical Mosfet LCA110 DIP6 65-30-110 3 U117 Temperature Controller, Analog TMP01FP DIP8 32-62-001 1 U118 Optical Mosfet LCA110 DIP6 65-30-110 U119 Optical Mosfet LCA110 DIP6 65-30-110 U120 Regulator, Continuous Fixed, +12V LM340T-12 TO-220 32-10-012 1 U121 Fixed Voltage Regulator, +8 VDC 78L08 TO-92 32-12-008 1 U122 Function Generator XR-2206 DIP16 32-55-206 2 U123 Function Generator XR-2206 DIP16 32-55-206 U124 SM, Regulator, Fixed +5V MIC2954-02BS SOT-223 34-23-005 1 MECHANICAL PARTS M101 PCB, AA21 Main Rev 1.30 15-21-001 1 M102 Socket, Tin Crimp Lead DIP6 80-00-006 3 M103 Socket, Tin Crimp Lead DIP8 80-00-008 11 M104 Shield, uMetal 35-10-099 1 M105 Screw, Panhead, Phillips, Steel MS35206-214 4-40, 0.32" 25-10-214 7 M106 Nut, Nylon Locking, Steel MS21044-N04 4-40, 0.15" 25-02-440 2 M107 Insulator, 4 Pin TO-18/4 27-99-018 3 M108 Insulator TO-220-5 15-99-2205 3 M109 Shorting Block 2 Pin 20-48-100 2 M110 Heatsink, AA20-431 50-20-020 2 M111 Socket, Tin Crimp Lead DIP16 80-00-016 2 End of Parts List Generated by Parts List Manager Ver: 2.7 Page: 6 of 6 Oct 8, 1999 Rev: 1.00 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

REV. SHEET DWG. NO. DWG. TYPE FILE DESIGNED DRAWN DATE CHECKED APPROVED SIZE CAGE CODE PART NO. TITLE A 3AB01 PROPRIETARY AND CONFIDENTIAL TO NAT LTD. 2 +28VDC POWER 3 +28VDC SWITCHED 4 +28VDC SWITCHED 1 +28VDC POWER 5 LIGHTS GROUND 6 28V LIGHTS 14 SIREN KEY 9 RADIO 11 N/C 12 N/C 10 PA 17 POT HI 16 POT WIPER 15 POT LO 13 POWER GROUND 18 WAIL RETURN 19 YELP RETURN 20 YELP ON 8 EXTERNAL SPKR 7 INTERNAL SPKR 21 WAIL ON 25 +28VDC POWER 26 +28VDC SWITCHED J401 26 PIN STRIP PLUG TO AA21-1x J102 SRK SRK OCT 7/99 401-0110.SCH SCHEMATIC AA21-4\401-0 1.10 1/1 AA21-4 CONTROL INTERFACE SUBASSEMBLY S401 POWER DS401 GREEN R402 2.2k S402 EXT/INT DOWN UP UP DOWN UP DOWN CW R401 10k POWER VOLUME 2 LIGHTS LO 1 LIGHTS HI J402 2 PIN STRIP SOCKET TO AA21-5x J501 D401 1N4005 S403 PA/RX 24 RECEIVE DISABLE 23 RSVSP 22 POWER GROUND 3 2 1 4 5 6 JP401 SIREN MODE 3 2 1 4 5 6 JP402 SIREN RETURN JP403 SIREN KEY NOTES: 1. ALL RESISTANCE VALUES IN OHMS, UNLESS OTHERWISE SPECIFIED. REVISIONS REV DESCRIPTION DATE BY 1.10 ECR #1556 : S401-S404 NAT PART # CHANGES (HIDDEN). FEB 11/00 SRK UP DOWN S404 WAIL/OFF/YELP 1 3 4 6 2 5 1 2 3 1 3 4 6 2 5 1 3 2 1 3 2

REV. SHEET DWG. NO. DWG. TYPE FILE DESIGNED DRAWN DATE CHECKED APPROVED SIZE CAGE CODE PART NO. TITLE A 3AB01 PROPRIETARY AND CONFIDENTIAL TO NAT LTD. 2 +28VDC POWER 3 +28VDC SWITCHED 4 +28VDC SWITCHED 1 +28VDC POWER 5 LIGHTS GROUND 6 28V LIGHTS 14 SIREN KEY 9 RADIO 11 N/C 12 N/C 10 PA 17 POT HI 16 POT WIPER 15 POT LO 13 POWER GROUND 18 WAIL RETURN 19 YELP RETURN 20 YELP ON 8 EXTERNAL SPKR 7 INTERNAL SPKR 21 WAIL ON 25 +28VDC POWER 26 +28VDC SWITCHED J401 26 PIN STRIP PLUG TO AA21-1x J102 SRK SRK NOV 30/99 401-0100.SCH SCHEMATIC AA21-4\401-0 1.00 1/1 AA21-4 CONTROL INTERFACE SUBASSEMBLY S401 POWER DS401 GREEN R402 2.2k S402 EXT/INT DOWN UP UP DOWN UP DOWN CW R401 10k POWER VOLUME 2 LIGHTS LO 1 LIGHTS HI J402 2 PIN STRIP SOCKET TO AA21-5x J501 D401 1N4005 S403 PA/RX 24 RECEIVE DISABLE 23 RSVSP 22 POWER GROUND 3 2 1 4 5 6 JP401 SIREN MODE 3 2 1 4 5 6 JP402 SIREN RETURN JP403 SIREN KEY NOTES: 1. ALL RESISTANCE VALUES IN OHMS, UNLESS OTHERWISE SPECIFIED. UP DOWN S404 WAIL/OFF/YELP 1 3 4 6 2 5 1 2 3 1 3 4 6 2 5 1 3 2 1 3 2

Description: Document#: Rev: AA21-4 AA21-4\701-0 Control Interface Subassembly 1.10 Prepared By: Checked By: Approved By: IDENT DESCRIPTION OR VALUE QTY. PACKAGE NAT P/N MFR. P/N DIODES D401 Rectifier, 1 A, 600 V 1N4005 DO-41 75-20-005 1 DISPLAYS DS401 LED, Green, Bi-pin 47-30-001 1 CONNECTORS J401 Strip Plug, Dbl Row Straight, PC Mnt 26 Pin 20-00-026L 1 J402 Strip Socket, Dbl Row Straight, PC Mnt 2 Pin 20-07-002 1 JUMPERS JP401 Wire Jumper, 22 AWG NSN 2 JP402 Wire Jumper, 22 AWG NSN 2 JP403 NOT INSTALLED N/A RESISTORS R401 Panel Pot, Linear 10 kOhm RV6 60-00-104 1 R402 Carbon Film, 1/2 W, 5% 2.2 kOhm RC20 70-02-223 1 SWITCHES S401 Toggle, SPDT, 2 Position, PC Mnt 7101SDCGE 85-00-107 1 S402 Toggle, SPDT, 2 Position Locking, PC 7101K12CGE 85-03-109 1 S403 Toggle, DPDT, 2 Pos Locking, PC Mnt 7201K12CGE 85-03-207 1 S404 Toggle, DPDT, Center Off Locking, PC 7203K12CGE 85-10-207 1 MECHANICAL PARTS M401 PCB, Control Interface Rev 1.00 15-21-404 1 M402 Standoff, Threaded, Aluminum 4-40 0.188"OD 25-47-500 2 M403 Screw, Flathead, Phillips, Steel MS24693-S4 4-40, 0.355" 25-13-934 2 M404 Insulator, LED 47-70-003 1 End of Parts List Generated by Parts List Manager Ver: 2.7 Page: 1 of 1 Dec 8, 1999 Rev: 1.10 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

Description: Document#: Rev: AA21-4 AA21-4\701-0 Control Interface Subassembly 1.00 Prepared By: Checked By: Approved By: IDENT DESCRIPTION OR VALUE QTY. PACKAGE NAT P/N MFR. P/N DIODES D401 Rectifier, 1 A, 600 V 1N4005 DO-41 75-20-005 1 DISPLAYS DS401 LED, Green, Bi-pin 47-30-001 1 CONNECTORS J401 Strip Plug, Dbl Row Straight, PC Mnt 26 Pin 20-00-026L 1 J402 Strip Socket, Dbl Row Straight, PC Mnt 2 Pin 20-07-002 1 JUMPERS JP401 Wire Jumper, 22 AWG NSN 2 JP402 Wire Jumper, 22 AWG NSN 2 JP403 NOT INSTALLED N/A RESISTORS R401 Panel Pot, Linear 10 kOhm RV6 60-00-104 1 R402 Carbon Film, 1/2 W, 5% 2.2 kOhm RC20 70-02-223 1 SWITCHES S401 Toggle, SPDT, 2 Position, PC Mnt MTA106D-PC 85-00-106 1 S402 Toggle, SPDT, Locking, PC Mnt M2012LL1G03 85-03-106 1 S403 Toggle, DPDT, Locking, PC M2022LL1G03 85-03-206 1 S404 Toggle, DPDT, Center Off Locking, PC M2023LL1G03 85-10-206 1 MECHANICAL PARTS M401 PCB, Control Interface Rev 1.00 15-21-404 1 M402 Standoff, Threaded, Aluminum 4-40 0.188"OD 25-47-500 2 M403 Screw, Flathead, Phillips, Steel MS24693-S4 4-40, 0.355" 25-13-934 2 M404 Insulator, LED 47-70-003 1 End of Parts List Generated by Parts List Manager Ver: 2.7 Page: 1 of 1 Dec 1, 1999 Rev: 1.00 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

REV. SHEET DWG. NO. DWG. TYPE FILE DESIGNED DRAWN DATE CHECKED APPROVED SIZE CAGE CODE PART NO. TITLE A 3AB01 PROPRIETARY AND CONFIDENTIAL TO NAT LTD. J501 2 PIN STRIP PLUG TO AA21-4x J402 SRK SRK OCT 7/99 401-0100.SCH SCHEMATIC AA21-5\401-0 1.00 1/1 AA21-5 BACKLIGHTING SUBASSEMBLY 2 LIGHTS LO 1 LIGHTS HI DS501 DS502 DS503 DS504 DS505 DS506

Description: Document#: Rev: AA21-5 AA21-5\701-0 Backlighting Subassembly 1.00 Prepared By: Checked By: Approved By: IDENT DESCRIPTION OR VALUE QTY. PACKAGE NAT P/N MFR. P/N DISPLAYS DS501 Lamp, Wire Lead 28 VDC T 3/4 45-62-028 6 DS502 Lamp, Wire Lead 28 VDC T 3/4 45-62-028 DS503 Lamp, Wire Lead 28 VDC T 3/4 45-62-028 DS504 Lamp, Wire Lead 28 VDC T 3/4 45-62-028 DS505 Lamp, Wire Lead 28 VDC T 3/4 45-62-028 DS506 Lamp, Wire Lead 28 VDC T 3/4 45-62-028 CONNECTORS J501 Strip Plug, Single Row, PC Mnt 2 Pin 20-00-002L 1 MECHANICAL PARTS M501 PCB, Backlighting, AA21 Rev 1.00 15-21-405 1 End of Parts List Generated by Parts List Manager Ver: 2.6 Page: 1 of 1 Aug 31, 1999 Rev: 1.00 CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM34 Maintenance Manual Build Standard: 5.00 Nov 09, 2016 Page 7-1 ENG-FORM: 872-0100.DOTX CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP. Section 7.0 Bulletins 7.1 Introduction Service Bulletins released periodically by AEM are contained in this section. As new bulletins are issued, this section should be updated in chronological order with the earliest documents appearing first. 7.2 Bulletin Listing Bulletin Number Subject Date Issued Date Received 603-0001 MOD3 – Fuse upgrade on +28 Vdc power Apr 26, 2002 Performed at factory 603-0002 MOD A – Heat from lamps bubbling faceplate Apr 11, 2007 Performed at factory 603-0003 Faceplate connector pins too long. AA21-403 and AA21-407 MOD B, AA21-408 MOD A Apr 10, 2008 Performed at factory Section 7.0 ends following the above bulletins

Apr 26, 2002 Page 3 of 3 ENG-FORM: 603-0110.DOT CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD. 2. Procedure Instructions 2.1 Modification Procedure Refer to Exploded View drawing AA21\400\904-0. Note: Some of the screws are secured with Loctite; an initial sharp twist is necessary to break the bond. 2.1.1 Remove cover M2 from Main subassembly SA1 by unfastening six flathead screws M9 from the top of the unit. 2.1.2 Remove F101 2.5 Amp, fast blow, subminiature fuse and replace with a 2.5 Amp, slow blow, subminiature fuse. 2.1.3 Replace cover M2 and refasten to Main subassembly SA1 with six flathead screws M9. Note: Apply a small amount of Loctite 222 to screw threads prior to insertion. 2.2 Identification Procedure Stamp an "X" (blacken out # 3) on the mod status tag to indicate MOD 3 has been incorporated. 3. Material Information The following parts are required to modify one AA21-400 to MOD 3 status. MFR. P/N IDENT DESCRIPTION OR VALUE PACKAGE NAT P/N QTY. F101 Fuse, Subminiature, Slow 2.5 Amp 23-10-125 1 4. Drawings The following documents are required to complete the modification. If additional drawings are required refer to the applicable Service manual. DRAWING REV. DESCRIPTION TYPE AA21\400\904-0 1.10 Cabin PA System Exploded View AA21-1A\401-0 1.20 Main Subassembly Schematic AA21-1A\701-0 1.20 Main Subassembly Parts List End of Service Bulletin