TM 1-1520-238-23
1-380
Change 2
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)
Above 130% single-engine overtorque with engine failure:
(cont)
NOTE
Momentary 130% overtorque indication will normally be considered be-
low 130%; a stabilized 130% overtorque indication will be considered
above 130% for purposes of this special inspection.
a. Replace main transmission input drive shaft and couplings on overtorqued
side.
b. Replace engine nose gearbox on overtorqued side.
c. Replace main transmission.
d. Check mounting system of overtorqued engine for loose hardware,
brackets, mounts or links, and other indications of overstress.
e. Check tail rotor drive shafts for cracks, deformation, and other indications
of overstress.
Above 130% single-engine overtorque without engine failure:
a. Perform steps a. thru e. listed for 130% or above overtorque with engine
failure.
b. Check main rotor drive shaft and drive plate for cracks, distortion, and
other indications of overstress.
c. Check main rotor strap packs for buckling and other indication of
overstress.
d. Check main rotor blades for buckling at trailing edges.
e. Check main rotor damper attachment holes for looseness (hole
enlargement). Replace damper, trunnion, and mounting hardware if hole
enlargement is found.
f. Check tail rotor for buckling and looseness.
g. Replace tail rotor fork.
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