TM 1-1520-238-23
Change 1
5-199
5.45.
MAIN ROTOR UPPER SEAL RETAINER AND PLAIN ENCASED SEAL
REMOVAL/INSTALLATION
5.45.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
5.45.2. 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)
Aircraft maintenance platform (item 211, App H)
1 3/4 & 2 3/4-inch rubber mallet (item 213, App H)
Adjustable air filtering respirator (item 262, App H)
Upper seal removal/installation tool kit (item 375,
App H)
Materials/Parts:
Brush (item 34, App F)
Cloth (item 52, App F)
Depressor (item 70, App F)
Epoxy primer coating kit (item 78, App F)
Methyl ethyl ketone (item 124, App F)
Sealing compound (item 177, App F)
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
One person to assist
67R3F
Attack Helicopter Repairer/Technical
Inspector
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
5.19
Main rotor hub retention nut removed
WARNING
FLIGHT SAFETY PART
The main rotor upper seal retainer and plain encased seal are a flight safety parts. Failure to
follow maintenance instructions may result in serious injury or death of crew members and/or
serious damage to the helicopter.
GO TO NEXT PAGE
