190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 20-10
20.5.2 Teardrop Antenna Installation Instructions
1. Refer to Table 20-5
and the outline and installation drawings in Section 20.8 for installation
guidance and selecting the appropriate mounting cutout. Drill or punch the holes to match the
mating part (doubler).
2. Install a doubler plate to reinforce the aircraft skin, as required. Refer to Section 20.5.1
for doubler
preparation and Table 20-5
for additional guidance on the doubler installation. Dimple aircraft skin
when the skin thickness is less than 0.051” for installation of flush head rivets. Countersink aircraft
skin when the skin thickness is between 0.051” and 0.063” for installation of flush head rivets.
3. For the GA 35, secure the O-ring in the O-ring groove on the underside of the antenna. Place the
antenna over the mounting holes, using the four screw holes to align the antenna and insert the
supplied four screws (Figure 20-32
).
CAUTION
GA 35 serial numbers below 110000 required screws with 80 degree countersink angle
and most aviation fasteners (AN509) are NOT compatible. Serial numbers 110000 and
higher, AN509 hardware is compatible. Antennas installed with incompatible hardware or
screws that have been over tightened will void antenna warranty.
4. For a stud mount teardrop footprint antenna, place the install gasket on top of aircraft skin using
the four screw holes to align the gasket (Figure 20-35
, Figure 20-37).
5. Washers and locking nuts (not provided) are required to secure the antenna. Torque the four #8-32
stainless steel locking nuts 12-15 in-lbs. Torque should be applied evenly across all mounting
studs or screws to avoid deformation of the mounting area.
6. Make sure the antenna base and aircraft skin are in continuous contact with the gasket or o-ring, as
appropriate to the antenna model.
7. Seal the antenna and gasket to the fuselage using Dow Corning 738 Electrical Sealant or
equivalent. Run a bead of the sealant along the edge of the antenna where it meets the exterior
aircraft skin. Use caution to make sure the antenna connectors are not contaminated with sealant.
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.
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