TM 1-1520-238-23
Change 4
6-363
6.83.
HEAT EXCHANGER BYPASS VALVE REPLACEMENT
6.83.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
6.83.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
Light duty laboratory apron (item 27, App H)
Industrial faceshield (item 129, App H)
Chemical protective gloves (item 154, App H)
15 - 75 foot-pound 3/8-inch drive click type torque
wrench (item 440, App H)
Materials/Parts:
Gasket
Lubricating oil (item 119, App F)
Wire (item 224, App F)
Personnel Required:
67R
Attack Helicopter Repairer
67R3F
Attack Helicopter Repairer/Technical
Inspector
References:
TM 1-1520-238-T
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.2
Access doors T250L, T250R, T290L,
T290R, L325, and R325 opened; panel
L200 or R200 removed
1.32
Main transmission oil system drained
WARNING
FLIGHT SAFETY PART
The main transmission is a flight safe-
ty 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
bypass valves.
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