TM 55-1520-228-BD
AIRFRAME
LIMITATIONS: None - Condition 1.
Inspect after every flight for
damage growth.
PERSONNEL/TIME REQUIRED:
●
1 Soldier
. 2 Hours
MATERIALS/TOOLS REQUIRED:
●
Skin Patch
●
Cherry Rivets (item 37, Appx C)
●
EA93NA Adhesive (item 6, Appx C)
PROCEDURAL STEPS:
1.
Remove sections of the tail boom
skin containing the damage. Stop
drill remaining cracks. Clean up
damaged skin using a minimum 0.125
inch radius.
2.
Prepare a patch of 2024-T3 aluminum
0.050 thick and shape to contour of tail
boom.
The patch must extend a minimum of
3 inches forward and aft, and 1 inch above
and below the damaged area, Figure 4-30.
3.
Sand surfaces lightly to remove all
surface finish. Clean areas with cleaner.
Bond patch to surface with EA934NA
adhesive.
4.
Install a minimum of three rows of
rivets running circumferentially on each
end and a minimum of one row of rivets
top and bottom running longitudinally in
the patch.
Rivet size to be the same as
skin lap joints, Figure 4-30.
5.
Record BDAR action taken. When
mission is complete, as soon as
practical, repair the equipment/system
using standard maintenance procedures.
Figure 4-30. Tail Boom Skin Damage
4-70
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