Arinc 743 Footprint Antenna Installation (Ga 36, Ga 37, Ga 55A, Ga 57X) - Garmin G3X Installation Manual

20.5 ARINC 743 Footprint Antenna Installation (GA 36, GA 37, GA 55A, GA 57X)

This section describes the structural mounting of the ARINC 743 footprint antenna (GA 36, GA 37, 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 20-16, 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 20-6 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 20-6 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)
20.5.1 Preparation of Doubler
1. Use Garmin P/N: 115-00846-00, or refer to Table 20-6 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 20-21) are required.
190-01115-01
Rev. AA
0.032" to 0.049"
Figure 20-14
12
1
MS20426AD4-x
Dimple
Countersink
Figure 20-18
Figure 20-21
G3X/G3X Touch Installation Manual - GPS/XM Antenna Installation
Figure 20-14,
Figure 20-24 shows installation of the ARINC
0.049" to 0.051"
Figure 20-15
16
MS20426AD4-x
Dimple
Countersink
Figure 20-19
Figure 20-22
(Figure 20-18) and doubler installation
Figure 20-15, or
Figure 20-17
0.051" to 0.063"
Figure 20-16
16
MS20426AD4-x
Countersink
None
Figure 20-20
Figure 20-23
Page 20-16