TM 1-1520-238-23
1-394
Change 8
1.137.
SPECIAL INSPECTION CHECKLIST – continued
Helicopter Serial No.:
Date:
Area
No.
REQUIREMENT
EVERY
Item
Status
Special
Inspection
No.
6
33
(cont)
(b) Check tip cap attach screws and tab for burns or discoloration.
(c) During blade removal, remove one expandable pin (blade
attachment pin) at a time from blade root and check for
discoloration.
1. If damage is found, replace expandable pin.
2. If damage is found, return blade to depot.
(d) After blade removal, check for the following:
1. Check electrostatic bonding and de-ice wiring and hardware for
damage. If damaged, replace components as required.
2. Remove lead lag link bushings and pin. Check for damage,
discoloration and arc burns on parts. If damage is found,
replace parts as required.
3. Check damper joints, damper attach holes, bushings and rod
end bearings for arcing, pitting, and burn marks. If damaged is
found, replace parts as required.
4. Remove pitch housing and inspect the housing and strap pack
assembly for damage, arcing, and burn marks. If damaged is
found, replace parts as required.
5. Check hub/mast electrostatic discharge brush holders for
damage, arcing, discoloration and burn marks.
6. Remove and check upper mast bearing for arcing and damage.
If damage is found, send rotor hub and bearings to depot for
evaluation and damage assessment.
7. Remove pitch control rod bolt from swashplate and check
upper and lower pitch control rod bearings for arcing. If
damaged is found, replace control rod.
8. Check rotating scissors for damage. If damaged is found,
replace scissors.
9. Disconnect servo control rods and check swashplate for proper
rotation and cyclic and collective movement. Replace
swashplate if rotating or stationary parts are damaged and if
pitch control rod or damper attach bolts were damaged.
10. Check entire hub assembly for direct lightning attachment
points.
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