TM 1-1520-238-23
Change 4
6-85
6.15.
TAIL ROTOR GEARBOX INPUT COUPLING REMOVAL/INSTALLATION
6.15.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
6.15.2. 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
One person to assist
67R3F
Attack Helicopter Repairer/Technical
Inspector
References:
TM 1-1520-238-T
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.2
Access fairings L530 and L540 removed
WARNING
FLIGHT SAFETY PART
The tail rotor gearbox 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 upper flange.
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