EFD1000 Installation Manual
DOCUMENT # A-01-126-00 PAGE 58-225 Revision H
© Copyright 2009 Aspen Avionics Inc.
6.9.7 RSM Doubler Fabrication
1) Determine the thickness of aircraft skin.
2) For aircraft skins 0.050” thick and less the doubler should be made from 0.050”
material. For aircraft skins thicker than 0.050 the doubler should be made from
material the same thickness as the skin.
3) Fabricate the doubler from 2024-T3 AMS-QQ-A-250/5 to the dimensions in Figure
6.11, Tolerances ± 0.030
Figure 6.11 – RSM Doubler
4) Remove burrs and break sharp edges (0.005” – 0.015”)
5) Finish with Alumiprep Etch and Alodine Conversion Coating, or equivalent.
6) Mask around the four (4) mounting holes the diameter of the mounting washers or
1/2" on the down side of the doubler (see Figure 6.12). Prime that side with epoxy
primer per MIL-P-23377 or equivalent. Do not prime the side that faces the aircraft
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