Arinc 743 Footprint Antenna Installation (Ga 55A, Ga 57X); Arinc 743 Footprint Antenna Doubler Design And Installation - Garmin GDU 37X Installation Manual

Figure 3-13 Doubler Installation, Teardrop Footprint Antenna, Skin Thickness 0.051" to

3.5 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 3-14, Figure 3-15, or Figure
3-16, 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. Figure 3-24 shows installation of the ARINC 743
footprint antenna.
Table 3-6 provides a summary of design and installation details for the antenna doubler. Figure 3-17
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 3-6 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)
Notes:
1. Rivet length determined at installation, dependent on thickness of material (rivet length = grip length +
1.5 * rivet diameter)
GDU 37X Installation Manual
190-01054-01
0.063"
0.032" to 0.049"
Figure 3-14
12
1
MS20426AD4-x
Dimple
Countersink
Figure 3-18
Figure 3-21
0.049" to 0.051" 0.051" to 0.063"
Figure 3-15
16
MS20426AD4-x MS20426AD4-x
Dimple
Countersink
Figure 3-19
Figure 3-22
Figure 3-16
16
Countersink
None
Figure 3-20
Figure 3-23
Page 3-13
Revision C