97-30 Garmin GTX 33 Transponder Installation (continued)
E. Antenna
Refer to § 6-80 for antenna locations & R66 Illustrated Parts Catalog (IPC) Chapter 6.
NOTE
Antenna installation depends on optional equipment installed.
Removal
1. Turn battery & avionics switches off and pull out XPDR (5 amp) circuit breaker at
panel.
2. Using plastic scraper, remove B270-1 sealant from around transponder antenna at
corners where it attaches to B322 plate/doubler.
3. Remove screws securing plate/doubler to cabin skin and disconnect antenna cable from
antenna. Remove hardware securing plate/doubler to antenna and remove antenna.
Installation
1. Turn battery & avionics switches off and pull out XPDR (5 amp) circuit breaker at
panel.
2. Remove paint & primer from between cabin skin and B322 plate/doubler to ensure
electrical ground.
3. Install hardware securing transponder antenna to plate/doubler. Verify security. Apply
small bead B270-1 sealant (0.1 inch max in height) around antenna at corners where
it attaches to plate/doubler and allow to dry.
4. Connect antenna cable to antenna and install screws securing mounting plate to cabin
skin. Verify security.
5. 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 GTX 33 Transponder Maintenance Manual and Instructions for Continued
Airworthiness as required.
NOTE
Garmin requires database information be updated regularly to
ensure information is current.
MAY 2015 Chapter 97 Avionics Page 97.13
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