TM 1-1520-238-23
Change 4
1-383
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)
Rotor underspeed (droop) below 90% with engine failure:
(cont)
a. Check tail rotor drive shafting for cracks, deformation, and other
indications of overstress.
b. Check main rotor strap packs for buckling and other indications of
overstress.
c. Check main rotor blades for buckling at trailing edges.
d. Check main rotor damper attachment holes for looseness (hole
enlargement). Replace damper, trunnion, and mounting hardware if hole
enlargement is found.
e. Check tail rotor for buckling or looseness.
18
Deleted.
2,7
19
DAILY BEFORE FIRST ENGINE START OF DAY
Check oil levels in engines No. 1 and No. 2.
a. No further action required if engine oil level has not changed.
b. Service to acceptable limits if engine oil has decreased.
c. Check level of corresponding engine nose gearbox (NGB) if engine oil
level has increased.
(1) Ensure engine oil level is in limits and note conditions.
(2) Quill shaft seal has failed if NGB oil level is low. Replace quill shaft
within next 50 flight hours (para 6.36).
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