TM 55-1520-240-23-4
5-137
REPAIR WEATHER-PROTECTIVE COVER (AVIM)
(Continued)
5-137
18.
Fill damaged area (3) with adhesive pack (E50).
Use tongue depressor (E424).
19.
Cure adhesive pack at 70º - 80ºF (21º - 27ºC)
for 24 hours.
20.
Sand adhesive pack to blend repaired area (3)
into skin (6).
INSPECT
21.
Repair delamination (7) around openings.
Delaminations shall not exceed 1 square-inch.
Find bond voids (8) by tapping suspect area
with edge of coin. Bond voids shall not exceed
9 square-inches and there shall be no skin
damage. If a void is suspected, refer to TM
1-1520-253-23.
22.
For voids only, drill 0.028 inch holes (4) 2
inches, apart through skin (6) over void (8).
23.
Mix adhesive as in step 10.
24.
Fill delamination (7) or void (8) with adhesive.
Use hypodermic syringe. For delamination, apply
clamp and go to step 28. For void, go to step 25.
25.
If void (8) does not fill completely, apply vacuum
as follows:
a.
Tape all holes (4). Use sealing tape (E396)
(9). Drill hole in center of repair area that has
not filled.
b.
Apply sealing tape (E396) (9) around repair
area (10).
c.
Apply polyvinyl sheet (E284) (11) over repair
area (10).
d.
Insert hose (12) of vacuum pump under
polyvinyl sheet (E284) (11). Apply vacuum to
draw adhesive mix into unfilled part of repair
area (10).
e.
Remove hose (12), sheet (11), and tape (9).
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