Antenna Installation Instructions - Garmin G3X Installation Manual

13.4.2 Antenna Installation Instructions

1. Refer to Table 13-5
guidance on 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. For the stud mount teardrop footprint antenna, place install gasket on top of aircraft skin using the
four screw holes to align the gasket.
4. Washers and locking nuts 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.
5. Ensure that the antenna base and aircraft skin are in continuous contact with the gasket or o-ring,
as appropriate to the antenna model.
6. 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. L
and the outline and installation drawings beginning with
Table 13-5 for additional guidance on the doubler installation. Dimple aircraft
G3X Installation Manual - GPS/XM Antenna Installation
Figure B-1.1 for
Section 13.4.1 for doubler
Page 13-9