GTS 8XX/GPA 65 Installation Manual Page 3-19
190-00587-00 Revision 4TP
3.6 GA 58 Antenna Installation
Refer to the GA 58 installation drawing shown in Appendix A of this manual.
CAUTION
Do not use construction grade RTV sealant or sealants containing acetic acid. These
sealants may damage the electrical connections to the antenna. Use of these type sealants
may void the antenna warranty.
1. Refer to the GA 58 installation drawing shown in Appendix A for the mounting cutout.
2. For composite aircraft, fabricate a ground plane under the antenna base plate on the internal
surface of the aircraft with recommended minimum dimensions of 18” x 18”, with center of
ground plane under the center of the antenna baseplate. Refer to notes in Antenna
Considerations section and Electrical Bonding section of this document.
3. For metal skin aircraft, do NOT remove paint on outer skin of aircraft under the footprint of the
antenna baseplate. The painted surface prevents corrosion.
4. Install a doubler plate to reinforce the aircraft skin as necessary.
5. Place the supplied O-ring, 251-00011-00, in the groove on the bottom surface of the antenna.
6. Mount the antenna to the airframe with the four supplied #8-32 stainless steel screws, 211-
60209-16. Washers and locking nuts (not provided, may be part of doubler plate) are required
to secure the antenna. Apply torque evenly across all mounting screws.
7. Ensure that the antenna base and aircraft skin are in continuous contact.
8. Fillet seal the antenna and gasket to the fuselage using a good quality electrical grade sealant,
MIL-S-8802B or equivalent. Run a bead of the sealant along the edge of the antenna where it
meets the exterior aircraft skin. Use caution to ensure that the antenna connector is not
contaminated with sealant. Seal the mounting screws with sealant.
9. Connect the four antenna cables ensuring each cable is connected to the correct antenna
connector. Each antenna connector and cable has a matching color band.
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