TM 1-1520-238-23
Change 1
5-135
5.27.
MAIN ROTOR PITCH HOUSING SHIM REPLACEMENT (AVIM) – continued
(2) Lightly sand surface of shim (1) to produce a
dull matt surface. Use cloth (item 48, App F).
(3) Wipe pitch housing (2) shim mating surface
clean. Use methyl ethyl ketone (item 124,
App F) and cloth (item 51, App F).
(4) Apply a light, even coat of primer to mating
surfaces of shim (1) and pitch housing (2).
Use primer (item 143, App F).
(5) Allow to air dry at room temperature for 30
MINUTES.
(6) Apply an even coat of adhesive to mating
surfaces of shim (1) and pitch housing (2).
Use adhesive (item 2, App F).
b. Install shim (1) on pitch housing (2).
(1) Install shim (1) on pitch housing (2) and hand
tighten clamp. Use clamping fixture (figure
D-454, App D).
(2) Wipe excess adhesive squeeze-out from pe-
rimeter of shim (1). Use cloth (item 51,
App F).
(3) Allow adhesive to cure for 24 HOURS at room
temperature.
c. Remove clamping fixture from pitch housing
(2).
d. Check shim (1) inner and outer ring area for
air bubbles under shim (1). None allowed.
e. Inspect (QA).
f. Install main rotor lead lag link (para 5.33).
END OF TASK
M04-2298-5
1
2
M04-2298-6
CLAMPING FIXTURES
SHIM
REMOVE EXCESS
SQUEEZE-OUT
PITCH HOUSING
REMOVE EXCESS
SQUEEZE-OUT FLUSH TO
TOP SURFACE OF SHIM
