190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 20-17
20.6.2 ARINC 743 Antenna Installation Instructions
1. Refer to Table 20-6
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 20.6.1
for doubler
preparation and Table 20-6
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 20-33
, Figure 20-34) on the
underside of the antenna.
4. Place the install gasket (if applicable, per Figure 20-36
or Figure 20-38) 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 20-33
, Figure 20-34 (or may use locking nuts installed on doubler plate, if applicable).
GA 55A (Figure 20-36
) and GA 57X (Figure 20-38) 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. Make sure 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 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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