TM 1-1520-238-23
5-42
Change 4
5.7.
MAIN ROTOR BLADE DEBONDED DOUBLER OR SPAR REPAIR (AVIM) – continued
p. Allow adhesive to cure at room temperature
for 24 HOURS.
q. Sand adhesive on blade (1) in a spanwise di-
rection. Use paper (item 133, App F).
r. Sand finish adhesive on blade (1) in a span-
wise direction. Use paper (item 135, App F).
s. Wipe blade (1) clean. Use methyl ethyl ketone
(item 124, App F) and cloth (item 51, App F).
t. Check repaired debonded doubler (2).
(1) Tap edge of a coin held between thumb and
forefinger on doubler (2). A bonded spot will
have a sharp ring. A debonded spot will have
a dull sound.
u. Fill and flair cavity between blade (1) and re-
paired doubler (2). Use adhesive (item 1, App F)
and sealant gun.
v. Allow compound to dry at room temperature
for 24 HOURS.
5.7.4. Spar Repair
a. Check spar (4) for debonded area.
(1) Tap edge of a coin held between thumb and
forefinger on main blade (1) and spar (4). A
bonded spot will have a sharp ring. A de-
bonded spot will have a dull sound.
b. Mark area of spar (4) to be repaired. Use wax
pencil (item 137, App F).
c. Sand spanwise to remove paint from de-
bonded spar (4) and surrounding area. Use
paper (item 133, App F).
d. Sand spanwise to finish sand spar (4) surface.
Use paper (item 135, App F).
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M04 2329 7
SANDED AREA
M04 2329 8
FILL AND FLAIR
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1
1
M04 2329 9
4
1
M04 2329 10
4
SANDED AREA
