TM 1-1520-238-23
Change 11
1-387
1.137.
SPECIAL INSPECTION CHECKLIST – continued
Helicopter Serial No.:
Date:
Area
No.
Special
Inspection
No.
REQUIREMENT
EVERY
Item
Status
6
27
10 FLIGHT HOURS
CHECK MAIN ROTOR STRAP PACK FOR THE FOLLOWING:
a. Perform inspection per step c. until one laminate is found discrepant.
b. A failed top or bottom laminate of strap pack assembly may be repaired
unless a crack or failure of a laminate is detected within one inch of
outboard shoe or inboard abrasion strip. If a crack is found, strap pack
assembly is unserviceable.
NOTE
Repair is not allowed for laminate failures under outboard or inboard
shoes. Repair limits are defined in paragraph 5.36. Upon detection of
any other discrepant laminate, strap pack assembly is unserviceable.
Ensure that collective control stick is in mid position, cyclic stick is in
neutral position, and swashplate is level/centered with respect to the
aircraft.
c. Inspect accessible portion of each strap pack for cracked, buckled,
broken, or horizontally displaced laminates. Use inspection mirror,
flashlight, and tongue depressor.
d. If the inspection of step c. is not conclusive, remove main rotor blade (para
5.3) and reinspect per step c. Ensure strap pack is as flat as possible
during inspection.
e. If the inspection of step d. is still not conclusive, remove pitch housing
(para 5.25) and reinspect per step c. Measure horizontal displacement.
Maximum allowable displacement is 0.020 INCH or if any change in
displacement exceeding 0.010 INCH is detected between inspections.
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