TM 1-1520-238-23
5-204
Change 1
5.46.
MAIN ROTOR LOWER OIL SEAL AND OIL SEAL RETAINER REPLACEMENT (AVIM)
5.46.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
5.46.2. Initial Setup
Tools:
Aircraft maintenance tool kit (item 372, App H)
Light duty laboratory apron (item 27, App H)
Chemical protective gloves (item 154, App H)
Sling set kit (item 194, App H)
1 3/4 & 2 3/4-inch rubber mallet (item 213, App H)
Adjustable air filtering respirator (item 262, App H)
1/4-inch - 20 socket head cap screw (item 274, App H)
(4)
Materials/Parts:
Cloth (item 52, App F)
Depressor (item 70, App F)
Grease (item 87, App F)
Methyl ethyl ketone (item 124, App F)
Pad (item 130, App F)
Sealing compound primer (item 146, App F)
Sealing compound (item 167, App F)
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
Two persons to assist
67R3F
Attack Helicopter Repairer/Technical
Inspector
Equipment Conditions:
Ref
Condition
5.48
Main rotor electrical brush and electrical
brush holder removed
WARNING
FLIGHT SAFETY PART
The main rotor lower oil seal and oil
seal retainer are flight safety parts.
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 in-
vert main rotor head. Failure to do
so could result in serious injury. If
injury occurs, seek medical aid.
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