97-54 Garmin GDL 88 ADS-B In Receiver Installation (continued)
E. Antenna
Refer to § 6-80 for antenna locations and R66 Illustrated Parts Catalog (IPC) Chapter 6.
NOTE
Antenna installation depends on number of COM installations
and additional equipment installed.
Removal
1. Turn battery switch off and pull out XPDR (5 amp) circuit breaker on circuit
breaker panel.
2. Using plastic scraper, remove B270-1 sealant from around GDL 88 antenna at
corners where it attaches to belly.
3. Disconnect antenna cable from antenna. Remove hardware securing antenna
to belly and remove antenna.
Installation
1. Turn battery switch off and pull out XPDR (5 amp) circuit breaker on circuit
breaker panel.
2. Remove paint & primer from antenna mating surfaces to ensure electrical ground.
3. Install hardware securing antenna to belly. Apply small bead B270-1 sealant
around antenna at corners where it attaches to belly and allow to dry.
4. Connect antenna cable to antenna. Verify security.
5. Perform ground checks per Part D steps 4 and 5.
F. Scheduled Maintenance and Inspections
NOTE
All factory-installed Garmin units are “on condition” and do not
require scheduled periodic maintenance. Units feature a BIT
(Built-In Test) function during each initial power-up that will
detect internal failure(s) and alert pilot.
NOTE
Refer to § 97-60 for avionics software information.
G. Special Maintenance and Inspections
1. Turn battery & avionics switches off. Open circuit breaker panel and access left
front seat.
2. Inspect condition of and verify no obvious damage to GDL 88, 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 left front seat. Perform ground checks per Part
D steps 4 and 5.
APR 2019 Chapter 97 Avionics Page 97.21
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