TM 55-1520-228-BD
AIRFRAME
Figure 4-18. Patch Plate
PROCEDURAL STEPS:
1.
Smooth off ragged edges on
damaged skin.
2.
Tape over hole. Use several
layers as necessary, and overlap
onto skin well beyond damaged area.
3. Record BDAR action taken. When
mission is complete, as soon as
practical, repair the equipment/system
using standard maintenance procedures.
4-17.
CAP, SKIN, WEB, DOUBLER
DAMAGE.
GENERAL INFORMATION: Much of the
fuselage construction is relatively
light built-up structure. Small
damage will likely exceed the
allowable limits and will require
repair. A patch plate can often be
used to repair the damage.
LIMITATIONS: None - Condition 1.
Inspect after every flight for
damage growth.
PERSONNEL/TIME REQUIRED:
2 Soldiers
2 Hours
MATERIALS/TOOLS REQUIRED:
Patch Plate
Cherry Rivets (item 38, Appx C)
PROCEDURAL STEPS:
1.
Remove sections of the aircraft
containing the damage. Smooth and
round the cutouts.
Stop-drill any
remaining cracks, Figure 4-19.
2.
Cut and fit a patch plate one
gauge thicker and of the same material
as the damaged structure.
The plate
thickness should be based on the thick-
est part of the damaged area.
The patch
plate should be large enough to allow
installation of the required fasteners
on all sides. Cut and fit shims to fill
gaps.
4-55
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