97-53 Garmin GTR 225B COM Radio Installation (continued)
E. Antenna (continued)
Removal
1. Turn battery switch off and pull out COM radio (5 amp) circuit breaker at panel.
2. Using plastic scraper, remove B270-1 sealant from around COM antenna at corners
where it attaches to tailcone.
3. Disconnect antenna cable from antenna. As required, remove B270-13 sealant
from fastener holes. Remove screws securing antenna to tailcone and remove
antenna.
Installation
1. Turn battery switch off and pull out COM radio (5 amp) circuit breaker at panel.
2. Remove paint & primer from antenna mating surfaces to ensure electrical ground.
3. As required, apply light coat B270-13 sealant to screw threads and install screws
securing antenna to tailcone. As required, seal around screw heads and fill fastener
holes using B270-13 sealant and allow to dry. Verify security.
4. Apply small bead B270-1 sealant (0.1 inch max in height) around antenna at corners
where it attaches to tailcone and allow to dry.
5. Connect antenna cable to antenna. Verify security.
6. Perform ground checks per Part D steps 4 and 5.
F. Scheduled Maintenance and Inspections
Every 100 hour or annual inspection, determine software and database versions and
update per Garmin GTR 225B Pilot's Guide as required.
NOTE
Garmin requires database information be updated regularly to
ensure information is current.
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 COM radio, 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.
MAY 2015 Chapter 97 Avionics Page 97.19
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