MAY 2015 Chapter 97 Avionics Page 97.7
97-15 GPS 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 & avionics switches off and pull out GPS 1 (5 amp) and GPS 2 (5 amp)
circuit breakers as required at panel.
2. Using plastic scraper, remove B270-1 sealant from around GPS antenna at corners
where it attaches to tailcone.
3. Disconnect antenna cable from antenna. As required, remove B270-13 sealant
from fastener holes. Remove hardware securing antenna (and B322-10 spacers for
NAV) to tailcone (or chin for glideslope) and remove antenna.
Installation
1. Turn battery & avionics switches off and pull out GPS 1 (5 amp) and GPS 2 (5 amp)
circuit breakers as required at panel.
2. a. For GPS antenna:
i. Remove paint & primer from antenna mating surfaces to ensure electrical
ground.
ii. 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.
iii. 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.
b. For NAV antenna:
i. Install hardware and B322-10 spacers (thick edge inward) securing antenna
to tailcone. Verify security.
c. For glideslope antenna:
i. Install screws securing antenna to chin. Verify security.
3. Connect antenna cable to antenna. Verify security.
4. Perform ground checks per Part D steps 4 and 5.
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