TM 1-1520-238-23
1-382
1.137.
SPECIAL INSPECTION CHECKLIST – continued
Helicopter Serial No.:
Date:
Area
No.
REQUIREMENT
EVERY
Item
Status
Special
Inspection
No.
2,4,6,7
17
(cont)
h. Check main rotor damper attachment holes for looseness (hole
enlargement). Replace damper, trunnion, and mounting hardware if hole
enlargement is found.
i. Check tail rotor assembly for buckling and looseness.
Above 130% dual-engine overtorque:
a. Replace both main transmission input drive shaft and couplings.
b. Replace both engine nose gearboxes.
c. Replace main transmission.
d. Replace main rotor drive shaft.
e. Check main rotor drive plate for cracks, distortion, and other indications of
overstress.
f. Check tail rotor drive shaft for cracks, deformation, and other indications of
overstress.
g. Check main rotor strap packs for buckling and other indications of
overstress.
h. Check main rotor blades for buckling at trailing edges.
i. Check main rotor damper attachment holes for looseness (hole
enlargement). Replace damper, trunnion, and mounting hardware if hole
enlargement is found.
j. Check tail rotor for buckling and looseness.
k. Replace tail rotor fork.
l. Check both engine mounting systems for loose hardware, brackets,
mounts or links, and other indications of overstress.
m. Check main rotor mast base for looseness, cracks, deformed flange, and
for loose and missing base nuts or PLI washers.
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