TM 1-1520-238-23
1-384
Change 9
1.137.
SPECIAL INSPECTION CHECKLIST – continued
Helicopter Serial No.:
Date:
Area
No.
REQUIREMENT
EVERY
Item
Status
Special
Inspection
No.
1
20
12 MONTHS (OR NEAREST PHASE INSPECTION)
Perform outside air temperature indicator functional check (TM 1-1500-204-23).
2,4,6,7
21
IF HELICOPTER EXPERIENCES A SUDDEN STOPPAGE CAUSED BY:
If cracks/delaminations are suspected, perform nondestructive inspection
(TM 1-1520-264-23).
a. Blade striking an object
b. Engine compressor stall
c. Foreign object damage
d. Main transmission seizure
Main rotor blade:
a. Check full blade chord for strike damage from impact point to trailing edge.
b. Check entire blade trailing edge for buckling.
c. Check all blade root end doublers and blade station 82 trailing edge bond
joints for delamination.
Head assembly main rotor:
a. Check rotor head for cracks or other obvious damage.
b. Check lead lag links and pitch housing in areas of lead lag link stops.
c. Check strap packs for leading edge failures and trailing edge buckling.
d. Check feathering bearing housings for cracked lugs.
e. Check main rotor hub for distortion (crinkled paint) and elongated bolt
holes.
f. Check main rotor drive plate and upper spline coupling on main rotor drive
shaft for damage.
g. Check droop stop mechanism.
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