TM 1-1520-238-23
Change 8
6-325
6.74.
MAIN TRANSMISSION APU INPUT SEAL REMOVAL/INSTALLATION
6.74.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
6.74.2. Initial Setup
Tools:
Aircraft maintenance tool kit (item 372, 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)
Main transmission seal removal/installation tool (Figure
D-461, App D)
Materials/Parts:
Sealing compound (item 161, App F)
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
67R3F
Attack Helicopter Repairer/Technical
Inspector
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
6.73
Main transmission APU drive flange re-
moved
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.
6.74.3. Removal
a. Remove and discard APU seal (1) from main
transmission housing (2). Use seal removal/
installation tool (Figure D-461, App D).
(1) Insert removal tool in seal (1). Use seal re-
moval/installation tool (Figure D-461, App D).
(2) Insert slide hammer in removal tool. Use seal
removal/installation tool (Figure D-461,
App D).
(3) Slide hammer aft contacting bolt head remov-
ing seal (1).
(4) Discard seal (1).
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