Garmin G3X Installation Manual page 224

20.5.2 ARINC 743 Antenna Installation Instructions
1. Refer to Table 20-6
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
preparation and
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. Secure the O-ring in the O-ring groove (if applicable, per
underside of the antenna.
4. Place the install gasket (if applicable, per
using the four screw holes to align the gasket.
5. Locking nuts and washers (not provided) are required to secure the GA 36 and GA 37 per
Figure 20-33, Figure 20-34
GA 55A (Figure
Torque the four supplied #10-32 stainless steel screws (Garmin P/N: 211-60212-20, MS51958-67,
or equivalent) 20-25 in-lbs. Torque should be applied evenly across all mounting studs to avoid
deformation of the mounting area.
6. Ensure that the antenna base and aircraft skin are in continuous contact with the gasket (if
applicable).
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 ensure that 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.
190-01115-01
Rev. AA
and the outline and installation drawings in
Table 20-6 for additional guidance on the doubler installation. Dimple aircraft
(or may use locking nuts installed on doubler plate, if applicable).
20-36) and GA 57X (Figure
G3X/G3X Touch Installation Manual - GPS/XM Antenna Installation
Section 20.7
Figure 20-33,
Figure 20-36 or Figure 20-38) on top of aircraft skin
20-38) use locking nuts installed on doubler plate.
for installation
Section 20.5.1 for doubler
Figure 20-34) on the
Page 20-17