190-01115-01 G3X/G3X Touch Installation Manual - GPS/XM Antenna Installation
Rev. AC Page 22-17
22.5.2 ARINC 743 Antenna Installation Instructions
1. Refer to Table 22-6
and the outline and installation drawings in Section 22.7 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 22.5.1
for doubler
preparation and Table 22-6
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. Secure the O-ring in the O-ring groove (if applicable, per Figure 22-33
, Figure 22-34) on the
underside of the antenna.
4. Place the install gasket (if applicable, per Figure 22-36
or Figure 22-38) on top of aircraft skin
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 22-33
, Figure 22-34 (or may use locking nuts installed on doubler plate, if applicable).
GA 55A (Figure 22-36
) and GA 57X (Figure 22-38) use locking nuts installed on doubler plate.
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.
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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