TM 1-1520-238-23
6-442
6.101.
MAIN TRANSMISSION REMOVAL
6.101.1. Description
This task covers:
6.102 Transmission Removal – Disconnect Left Side.
6.103 Transmission Removal – Disconnect Catwalk Area.
6.104 Transmission Removal – Disconnect Right Side.
6.105 Transmission Removal – Platform Installation.
6.106 Transmission Removal – Lower and Remove Transmission.
6.101.2. Initial Setup
Tools:
Aircraft maintenance tool kit (item 372, App H)
Airframe adapter kit (item 25, App H)
Transmission
jackscrew
(item 186,
App H)
(p/o item 397, App H)
Sling set kit (item 194, App H)
Rail type trailer (item 396, App H)
Transmission removal kit (item 397, App H)
1 1/4 & 1 5/16-inch open end wrench (item 419, 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)
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
Two persons to assist
References:
TM 55-1500-335-23
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.2
Access doors T250L, T250R, T290L,
T290R, and L325 opened; panels L200 and
R200 removed; fairings L230 and R230 re-
moved
1.32
Main transmission oil system drained
7.3
Primary hydraulic system vented
7.57
Utility hydraulic system vented
12.32
Main deck fire/overheat detector removed
1.97
Maintenance crane installed
5.3
Main rotor blades removed
6.95
Main rotor gearshaft removed
9.26
AC generator No. 1 removed
9.27
AC generator No. 2 removed
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.
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