Arinc 743 Footprint Antenna Installation (Ga 55A, Ga 57X); Arinc 743 Footprint Antenna Doubler Design And Installation - Garmin G3X Installation Manual

13.5 ARINC 743 Footprint Antenna Installation (GA 55A, GA 57X)

This section describes the structural mounting of the ARINC 743 footprint antenna (GA 55A, GA 57X)
installation. One acceptable method is to use Garmin P/N: 115-00846-00 doubler plate. Another
acceptable method is to fabricate and install one of three doublers,
Figure 13-16, depending on the thickness of the skin. The three doubler designs vary only by number of
rivets and hole preparation for installation with flush rivets.
743 footprint antenna.
Table 13-6 provides a summary of design and installation details for the antenna doubler.
shows an example of the doubler installed between stringers on the top fuselage skin, just off centerline.
The location should be flat, with no gaps between the skin and doubler, to keep from deforming the skin
during installation.
Table 13-6 ARINC 743 Footprint Antenna Doubler Design and Installation
Skin Thickness
Doubler Design (Figure)
Number of Rivets Required
Type of Rivets Required
Skin Preparation for Rivets
Doubler Preparation for Rivets
Skin Cutout Detail (GA 55A)
Doubler Installation (Figure)
1
Rivet length determined at installation, dependent on thickness of material (rivet length = grip length +
1.5 * rivet diameter)
13.5.1 Preparation of Doubler
1. Use Garmin P/N: 115-00846-00, or refer to Table 13-6 for guidance on selecting the appropriate
doubler drawing based on the thickness of skin at the antenna location. Make the doubler from
2024-T3 Aluminum (AMS-QQ-A-250/5), 0.063" sheet thickness.
2. For installation in aircraft skins of thickness less than 0.051", countersink the rivet holes in the
doubler for use with flush head rivets (MS20426AD4-x).
3. When using Garmin P/N: 115-00846-00 doubler, sixteen rivet holes exist in the part. For
installation of Garmin P/N: 115-00846-00 in skins of thickness between 0.032" and 0.049", only
the rivets identified for use through the skin cutout detail
(Figure 13-21) are required.
190-01115-01
Rev. L
0.032" to 0.049"
Figure 13-14
12
1
MS20426AD4-x
Dimple
Countersink
Figure 13-18
Figure 13-21
G3X Installation Manual - GPS/XM Antenna Installation
Figure 13-14, Figure
Figure 13-24 shows installation of the ARINC
0.049" to 0.051"
Figure 13-15
16
MS20426AD4-x
Dimple
Countersink
Figure 13-19
Figure 13-22
(Figure 13-18) and doubler installation
13-15, or
Figure 13-17
0.051" to 0.063"
Figure 13-16
16
MS20426AD4-x
Countersink
None
Figure 13-20
Figure 13-23
Page 13-15