TM 1-1520-238-23
Change 5
6-13
6.2.
ENGINE INPUT DRIVE SHAFT AND OUTER DIFFUSER (ONE-PIECE)
REMOVAL/INSTALLATION
6.2.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
6.2.2. 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)
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
2.123
Engine nose gearbox fairings and shrouds
removed
6.32
Engine nose gearbox two-section outer dif-
fuser removed (if a two-section outer diffuser
is installed in place of a one-piece outer dif-
fuser)
WARNING
FLIGHT SAFETY PART
The input drive shaft 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.
Exercise care and undertake protective measures when handling or performing any type of maintenance
on the engine input drive shaft. All surface areas are critical. Accidental dents or scratches caused by
improper handling may render part unserviceable.
To prevent damage to engine input drive shaft, ensure that work area is clean and that part is placed on
a soft and adequately protected working surface.
NOTE
This task is typical for either No. 1 or No. 2 engine input drive shaft.
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