TM 1-1520-238-23
6-370
6.85.
HEAT EXCHANGER REMOVAL
6.85.1. Description
This task covers:
Removal. Cleaning. Inspection.
6.85.2. Initial Setup
Tools:
Aircraft maintenance tool kit (item 372, App H)
Light duty laboratory apron (item 27, App H)
Industrial faceshield (item 129, App H)
Chemical protective gloves (item 154, App H)
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.2
Access doors T250L, T250R, T290L,
T290R, and L325 opened; panel L200 or
R200 removed
2.84
Forward catwalk removed
6.84
Heat exchanger pressure transducer re-
moved
15.41
APU enclosure removed
6.16
No. 7 drive shaft removed (right heat ex-
changer only)
1.32
Main transmission oil system drained
12.29
Left engine firewall louver fire/overheat de-
tector frame removed
12.31
Right engine firewall louver fire/overheat de-
tector frame removed
WARNING
FLIGHT SAFETY PART
The main transmission and heat exchangers are flight safety parts. Failure to follow
maintenance instructions may result in serious injury or death of crewmembers and/or serious
damage to the helicopter.
NOTE
Except as specified, this task is typical for either left or right heat exchangers.
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