TM 1-1520-238-23
6-270
Change 6
6.61.
MAIN TRANSMISSION FILTER BOWL, ELEMENT, AND DIFFERENTIAL PRESSURE SWITCH
(LOCKWIRED TYPE) REMOVAL/INSTALLATION
6.61.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
6.61.2. Initial Setup
Tools:
Aircraft maintenance tool kit (item 372, App H)
Light duty laboratory apron (item 27, App H)
1 1/4 x 3/8-inch drive open end socket wrench crowfoot
attachment (item 89, App H)
Industrial faceshield (item 129, App H)
Chemical protective gloves (item 154, App H)
Adjustable air filtering respirator (item 262, App H)
0 - 300 inch-pound 3/8-inch drive click type torque
wrench (item 439, App H)
Materials/Parts:
Packing (2) or (4)
Assembly fluid (item 30, App F)
Sealing compound (item 175, App F)
Wire (item 222, App F)
Wire (item 226, 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
2.2
Access panel L200 or R200 removed
1.32
Main transmission oil system drained
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.
NOTE
This task is typical for either right or left main transmission oil filter bowl, element, and differential
pressure switch.
The 7-311310001-41/43 main transmissions have a chamfer cutout on the housing to allow for a
second packing to be used in the installation of the main transmission oil filter bowls.
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