TM 1-1520-238-23
2-320
Change 9
2.90.
AFT LEFT CENTER TRANSMISSION ROTOR SUPPORT STRUT ASSEMBLY
REMOVAL/INSTALLATION
2.90.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
2.90.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
1/2 x 3/4-inch drive socket wrench adapter (item 2,
App H)
3/4 x 1/2-inch drive socket wrench adapter (item 5,
App H)
44-inch x 3/4-inch drive telescopic bar (item 29, App H)
3/4 x 6-inch long driftpin (item 113, App H)
5-inch x 1/2-inch drive socket wrench extension
(item 124, App H)
1/2-inch drive ratchet socket wrench handle (item 172,
App H)
15/16 & 1-inch box wrench (item 412, App H)
Socket wrench (item 428, App H) (p/o item 391 and
391A, App H)
or
Socket wrench (item 428A, App H) (p/o item 391A,
App H)
100 - 500 foot-pound 3/4-inch drive click type torque
wrench (item 438, App H)
Materials/Parts:
Cotter pin
Wire (item 226, App F)
Antiseize compound (item 26, App F)
Personnel Required:
67R
Attack Helicopter Repairer
One person to assist
67R3F
Attack Helicopter Repairer/Technical
Inspector
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.2
Access doors T250L, T250R, T290R, and
L325 opened
2.94
Left aft side transmission rotor support strut
assembly removed
12.32
Main deck fire/overheat detector removed
6.90
Air data system (ADS) mast removed
1.79
Air vehicle sling installed
1.97
Maintenance crane installed
WARNING
FLIGHT SAFETY PART
Rotor support mast support base 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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M04-1464-5
