Cessna SK180-26A Quick Start Manual

SK180-26A
FEBRUARY 3, 1969
Title
MARKER BEACON ANTENNA MODIFICATION
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.