TM 1-1520-238-23
6-28
Change 4
6.6.
FORWARD HANGER BEARING COUPLING REMOVAL/INSTALLATION
6.6.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
6.6.2. Initial Setup
Tools:
Aircraft maintenance tool kit (item 372, App H)
7/16 x 3/8-inch drive torque wrench adapter (item 22,
App H)
Light duty laboratory apron (item 27, App H)
Chemical protective gloves (item 154, App H)
Adjustable air filtering respirator (item 262, App H)
10 - 50 inch-pound 1/4-inch drive click type torque
wrench (item 434, App H)
30 - 150 inch-pound 3/8-inch drive click type torque
wrench (item 441, App H)
Materials/Parts:
Corrosion preventive compound (item 62A, App F)
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
67R3F
Attack Helicopter Repairer/Technical
Inspector
References:
TM 1-1520-238-T
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.2
Access doors T250L, T250R, T290L,
T290R, and L325 opened
2.84
Forward catwalk folded back
WARNING
FLIGHT SAFETY PART
The forward hanger bearing coupling 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.
NOTE
For purposes of identification and applicable to this task only, coupling flange with attached nutplates
is considered coupling forward flange.
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