TM 1-1520-238-23
5-106
Change 2
SECTION II.
MAIN ROTOR HEAD MAINTENANCE
5.21.
MAIN ROTOR HEAD REMOVAL/INSTALLATION
5.21.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
5.21.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
Airframe adapter kit (item 25, App H)
Sling set kit (item 194, App H)
Personnel Required:
67R
Attack Helicopter Repairer
Two persons to assist
67R3F
Attack Helicopter Repairer/Technical
Inspector
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.2
Access doors T250L, T250R, T290L,
T290R, and L325 opened
1.97
Aircraft mounted maintenance crane
installed
11.16
Load bearing main rotor scissor discon-
nected
11.18
Secondary main rotor scissor disconnected
5.19
Main rotor hub retention nut removed
5.48
Main rotor electrical brush, electrical holder,
and pitch web electrical lead removed
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 can re-
sult in serious injury. If injury oc-
curs, seek medical aid.
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M04-224-1
