TM 1-1520-238-23
5-40
Change 1
5.7.
MAIN ROTOR BLADE DEBONDED DOUBLER OR SPAR REPAIR (AVIM) – continued
5.7.3. Doubler Repair
a. Check main rotor blade (1) for cracks (para
5.1).
b. Check doubler (2) for debonded area.
(1) Tap edge of a coin held between thumb and
forefinger on main blade (1) and doubler (2).
A bonded spot will have a sharp ring. A de-
bonded spot will have a dull sound.
c. Mark area of doubler (2) to be repaired.
d. Sand spanwise to remove paint from de-
bonded doubler (2) and surrounding area. Use
paper (item 133, App F).
e. Sand spanwise to finish sand doubler (2) sur-
face. Use paper (item 135, App F).
f. Lift debonded doubler (2) just high enough to
remove existing loose cured adhesive.
(1) Scuff sand surface of remaining adhesive.
Use paper (item 133, App F) and paper
(item 135, App F).
g. Remove loose scale, chips, and dust between
mating surface of blade (1) and debonded
doubler (2).
h. Brush and wipe between mating surface of
blade (1) and debonded doubler (2). Use brush
(item 34, App F) and methyl ethyl ketone
(item 124, App F).
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