Cessna SK180-26A Quick Start Manual

C ssna. MODELS AFFECTED SERIALS AFFECTED 150 All serials prior to serial 15059834 172 All serials prior to serial 17250075 P172 All serials prior to serial P17257171 180 All serials prior to serial 18051226 182 All serials prior to serial 18254619 185 All serials prior to serial 185-0549 205 All serials prior to serial 205-0254 210 All serials prior to serial 21058143 PURPOSE: To install a rod antenna to replace the marker beacon wire antenna. NOTE Aircraft with wire antenna installations have developed cracks in the antenna masts. All such installations may be retrofitted with this installation of a rod antenna. PARTS LIST: QUANTITY PART NUMBER NOMENCLATURE 1 0770681-1 Antenna Rod Assembly - Marker Beacon 2 AN970-3 Washer 1 MS20365-1032C Nut 1 AN520-10R12 Screw 1 AN936A10 Washer 1 AN742D3 Clamp 1 AN515-8R6 Screw 1 MS20364-832C Nut 1 Installation Instructions INSTALLATION INSTRUCTIONS: a. Drill a # 10 (0. 1935 inch) hole approximately two inches forward of the ceramic feed-thru insulator connected to the existing wire marker-beacon antenna. b. Refer to figure 1; drill a # 10 (0. 1935 inch) hole aft of the insulator. Refer to dimensions given to locate this hole. c. Remove screws securing both antenna masts and remove masts. Plug screw holes in skin by re- installing sheet metal screws. d. Install rod antenna as shown in figure 1. e. Using the wire formerly connected to the wire antenna, a clamp, screw, and nut. connect the rod antenna to the feed-thru insulator.

position of the clamp on the rod antenna to attain a maximum signal. AN520-10R12 SCREW AN970-3 WASHER AN936A10 WASHER MS20365-1032C NUT AN970-3 WASHER 1 EA REQD 1 EA REQD *27. 5" (MODEL 205-210) *25 (MODEL 150, 172, P172, 180, 182, 185) (ADJUST CLAMP POSITION FORE-AND-AFT FOR MAXIMUM SIGNAL) *DIMENSIONS ARE APPROXIMATE AND MAY BE VARIED TO ALLOW INSTALLATION TO CLEAR FUSELAGE STRUCTURE. **PART OF ANTENNA ASSY NO. 0770681-1 Figure 1. Marker Beacon Rod Antenna Installation 2 of 2