TM 1-1520-238-23
6-152
Change 5
6.33.
ENGINE NOSE GEARBOX FLEXIBLE COUPLING, VANEAXIAL FAN, AND INLET DIFFUSER
REMOVAL/INSTALLATION
6.33.1. Description
This task covers:
Removal. Cleaning. Inspection. Repair. Installation.
6.33.2. Initial Setup
Tools:
Aircraft maintenance tool kit (item 372, App H)
0.000 - 0.125-inch dial indicator depth gage (item 145,
App H)
Nose gearbox shaft locknut face spanner wrench
socket (item 317, App H)
Engine nose gearbox bearing nut wrench (item 407,
App H)
700 - 1600 inch-pound 1/2-inch drive click type torque
wrench (item 433, App H)
10 - 50 inch-pound 1/4-inch drive click type torque
wrench (item 434, App H)
30 - 150 inch-pound 1/4-inch drive click type torque
wrench (item 435, App H)
0 - 75 inch-pound 1/4-inch drive dial indicator torque
wrench (item 446, App H)
Materials/Parts:
Locknut (6)
Washer (6)
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
67R3F
Attack Helicopter Repairer/Technical
Inspector
References:
TM 1-1500-204-23
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
6.2
No. 1 and/or No. 2 engine input drive shaft
and outer diffuser removed
WARNING
FLIGHT SAFETY PART
The nose gearbox flexible 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.
CAUTION
Do not intermix outer diffusers (one-piece or two-section), inlet diffusers, or vaneaxial fans. Intermix-
ing or swapping these components will result in damage to components.
Flexible couplings are made of thin metal and are fragile. Exercise caution and undertake protective
measures when working on or around flexible coupling in order to prevent scratching or denting.
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