TM 55-1520-240-23-4
5-137.1
REPAIR COMPOSITE WEATHER-PROTECTIVE COVER (AVIM)
(Continued)
5-137.1
BOND VOID (OVER 2 SQUARE-INCHES)
29.
Determine extent of void (11) by tapping area
with coin. Outline area (12) of void with a circle or
oblong. Use pencil compass or straightedge. If a
void is suspected, refer to TM 1-1520-253-23.
NOTE
Do not sand into glass fibers.
Complete removal of primer is not
necessary.
30.
Remove finish to primer from an area 1.5 inches
larger in all directions than outline (12). Use
abrasive paper (E8). Use cloths (E120) damp
with acetone (E20) as needed to soften finish.
Wear gloves (E186).
31.
Cut away unbonded skin. Use craftsman’s knife.
32.
Examine exposed core material (13). If core is
not damaged, clean the core and surrounding
area with clean cloths (E120) damp with acetone
(E20). Wipe dry with clean dry cloth. Go to step
47.
33.
If core (13) is damaged, cut out core to layer of
adhesive on opposite skin (14). Be careful not
to damage skin. Use a chisel.
34.
Roughen surface of adhesive on opposite skin
(14) to remove gloss.
NOTE
Core material must be clean and dry
for adhesive to hold.
35.
Cut core plug (15) in shape of cavity (16) but
1/8 inch larger all around. Use core material
(E150.3 or E150.1).
36.
Fit core plug (15) into cavity (16). If plug does
not protrude above level of existing core (13), go
to step 43. If plug protrudes above level of core,
go to step 37.
5-759
