TM 1-1520-238-23
5-208.6
Change 3
5.46B.
MAIN ROTOR UPPER BEARING INNER RACE/ROLLERS GREASE REPACKING
(AVIM)
5.46B.1. Description
This task covers:
Removal. Cleaning. Inspection. Servicing. Installation.
5.46B.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)
Bearing lubricant packer (item 204, App H)
Adjustable air filtering respirator (item 262, App H)
Materials/Parts:
Cloth (item 52, App F)
Depressor (item 70, App F)
Cotton gloves (item 82, App F)
Grease (item 87, App F)
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
67R3F
Attack Helicopter Repairer/Technical
Inspector
References:
TM 55-1500-322-24
Equipment Conditions:
Ref
Condition
5.21
Main rotor head removed
5.45
Main rotor seal retainer removed
WARNING
FLIGHT SAFETY PART
The main rotor upper bearing is a
flight safety part. Failure to follow
maintenance instructions may result
in serious injury or death of
crewmembers and/or serious damage
to the helicopter.
CAUTION
Wear cotton gloves when handling
main rotor upper bearing inner race/
rollers. Failure to do so will result in
damage to bearing.
Upper bearing inner race/rollers must
be protected from local environmental
contamination and external impact
during inspection and other handling.
Failure to do so will result in damage to
bearing.
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M04-5168-1
