TM 1-1520-238-23
6-344
6.80.
MAIN TRANSMISSION CHECK VALVE REMOVAL/INSTALLATION
6.80.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
6.80.2. Initial Setup
Tools:
Aircraft maintenance tool kit (item 372, App H)
Light duty laboratory apron (item 27, App H)
1 3/16 x 1/2-inch drive open end box socket wrench
crowfoot attachment (item 79, App H)
7/8 x 3/8-inch drive open end socket wrench crowfoot
attachment (item 100, App H)
Industrial faceshield (item 129, App H)
Chemical protective gloves (item 154, App H)
1 3/16 & 1 1/4-inch open end wrench (item 420, App H)
0 - 600 inch-pound 3/8-inch drive dial indicator torque
wrench (item 447, App H)
Materials/Parts:
Packing
Petrolatum (item 138, App F)
Wire (item 224, App F)
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
67R3F
Attack Helicopter Repairer/Technical
Inspector
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.2
Access doors T250L, T250R, T290L,
T290R, and L325 opened; panel L200 or
R200 removed
WARNING
FLIGHT SAFETY PART
The main transmission check valve 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
This task is typical for either left or right check valve.
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