97-58 Intercom System Installation (continued)
E. Antenna
Refer to § 6-80 for marker beacon antenna location and R66 Illustrated Parts Catalog
(IPC) Figure 6-13.
Removal
1. Turn battery switch off and pull out ICS (5 amp) circuit breaker at panel.
2. Using plastic scraper, remove B270-1 sealant from around CI 102 marker beacon
antenna at corners where it attaches to belly panel.
3. Remove hardware securing F794 forward belly panel to belly and disconnect F850-
210 antenna cable from antenna. Remove screws securing antenna to panel and
remove antenna.
Installation
1. Turn battery switch off and pull out ICS (5 amp) circuit breaker at panel.
2. Remove paint and primer from antenna mating surfaces to ensure electrical ground.
3. Apply light coat B270-11 adhesive to screw threads and install screws securing CI
102 marker beacon antenna to F794 forward belly panel. Verify security.
4. Connect F850-210 antenna cable to antenna. Install screws securing forward
belly panel to belly. Verify security.
5. Apply small bead B270-1 sealant (0.1 inch max in height) around antenna at corners
where it attaches to belly panel and allow to dry.
6. Perform ground checks per Part D steps 4 and 5.
F. Scheduled Maintenance and Inspections
On condition.
G. Special Maintenance and Inspections
1. Turn battery & avionics switches off. Open circuit breaker panel and upper console.
2. Inspect condition of and verify no obvious damage to audio control, radio tray,
copper bus bars, circuit breaker, and wiring. Verify no loose, chafed, or broken
wires or terminals. Verify no evidence of arcing. Verify equipment security.
3. Secure circuit breaker panel and upper console. Perform ground checks per Part D
steps 4 and 5.
Page 97.28 Chapter 97 Avionics MAY 2015
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