TM 1-1520-238-23
Change 8
6-295
6.67.
MAIN TRANSMISSION ROTOR BRAKE SEAL REPLACEMENT
6.67.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
6.67.2. Initial Setup
Tools:
Aircraft maintenance tool kit (item 372, App H)
1/2 x 3/4-inch drive socket wrench adapter (item 2,
App H)
Light duty laboratory apron (item 27, App H)
Chemical protective gloves (item 154, App H)
14-inch x 1/2-inch drive hinged socket wrench handle
(item 170, App H)
Adjustable air filtering respirator (item 262, App H)
Bushing driver set (item 280, App H)
Locknut socket set (item 318, App H)
0 - 600 foot-pound 3/4-inch drive deflecting frame
torque wrench (item 443, App H)
Materials/Parts:
Packing
Petrolatum (item 138, App F)
Sealing compound (item 161, App F)
Wire (item 222, App F)
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
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
2.84
Front catwalk folded back
6.66
Main transmission rotor brake disk removed
WARNING
FLIGHT SAFETY PART
The main transmission 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.
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