TM 1-1520-238-23
5-187
5.42.
MAIN ROTOR HEAD DISASSEMBLY (AVIM)
5.42.1. Description
This task covers:
Disassembly. Cleaning. Inspection.
5.42.2. Initial Setup
Tools:
Aircraft maintenance tool kit (item 372, App H)
3/4-inch drive hinged socket wrench handle (item 173,
App H) (2)
Sling set kit (item 194, App H)
1 1/8 x 3/4-inch drive deep socket wrench socket
(item 295, App H)
1 1/4 x 3/4-inch drive socket wrench socket (item 309,
App H)
1 1/16 & 1 1/8-inch box wrench (item 410, App H)
12-inch strap pipe wrench (item 425, App H)
Materials/Parts:
Wood block (2)
Cloth (item 52, App F)
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
Two persons to assist
67R3F
Attack Helicopter Repairer/Technical
Inspector
Equipment Conditions:
Ref
Condition
5.37
Main rotor feathering bearing housings re-
moved (four places)
WARNING
FLIGHT SAFETY PART
The main rotor head is a flight safe-
ty
part.
Failure
to
follow
maintenance instructions may
result in serious injury or death of
crewmembers and/or serious
damage to the helicopter.
Main rotor head weighs approxi-
mately 675 pounds. Use crane to lift
rotor head. Failure to do so could
result in serious injury. If injury oc-
curs, seek medical aid.
5.42.3. Disassembly
a. With assistants, place main rotor head (1) on
wood blocks. Use sling set kit.
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M04-246-1
BLOCKS
1
