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IFD5XX Installation Manual
600-00299-000
Page 39 of 198
Revision: 02
saddle is to act as a tapered shim and is not intended to
transfer load into the skin
Doubler Fabrication:
Doubler material is to be 2024-T3 clad aluminum per AMS
QQ-A-250/5
Form the doubler to match the fuselage curvature
Etch, alodine, and prime the doubler per the guidance
provided in AC43.13-1B
Drill holes and install rivets per AC43.13-1B
o
It is acceptable to slightly vary the rivet and row
spacing to accommodate existing frames and
stringers provided 2D edge distance and 4D
minimum rivet spacing is maintained and no rivet is
installed within 0.75” of the antenna mounting holes
o
Rivet type is dependent on the type of rivets in the
adjacent fuselage structure. If the adjacent rivets in
the structure around the bay selected for the doubler
installation are protruding head type, install
MS20470AD rivets in the outer row of the doubler.
If the adjacent rivets are countersunk or dimpled,
install either MS20426AD or NAS1097AD rivets per
the table below.
Reference Table 93 for rivet type
and doubler thickness appropriate for the aircraft's
skin thickness.
Fuselage Thickness
Doubler Thickness
Doubler Drawing
0.016-0.025"
0.020"
See Figure C - 37
0.032-0.050
0.032"
Table 19: Doubler Thickness
3.3.1 GPS Location
The following recommendations should be followed when choosing an installation location
for the GPS antenna. Prior to installing the GPS antenna, it is recommended to temporarily
mount the GPS antenna in the desired location and functional ground test the GPS system.
The antenna must be mounted on the exterior upper fuselage of the
aircraft
The GPS antenna should be mounted more than 2 feet from any
transmitting antenna.
The GPS antenna should be mounted in a location that minimizes
the effects of shadowing by the aircraft structure.
The GPS antenna should be installed more than 6 inches from any
other antenna, including another GPS antenna.
Содержание IFD540
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Страница 124: ...IFD5XX Installation Manual 600 00299 000 Page 124 of 198 Revision 02 Figure C 34 Instrument Panel Cutout ...
Страница 125: ...IFD5XX Installation Manual 600 00299 000 Page 125 of 198 Revision 02 Figure C 35 GPS Antenna Installation Forward ...
Страница 127: ...IFD5XX Installation Manual 600 00299 000 Page 127 of 198 Revision 02 Figure C 37 GPS Antenna Doubler ...
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