TM 1-1520-238-23
Change 8
1-153
1.48.
ENVIRONMENTAL CONTROL UNIT (ENCU) CLEANING (WATER WASH)
1.48.1. Description
This task covers:
Cleaning.
1.48.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
Light duty laboratory apron (item 27, App H)
Electric vacuum cleaner (item 64, App H)
Pneumatic cleaning gun (item 66, App H)
Reciprocating compressor unit (item 67, App H)
Industrial faceshield (item 129, App H)
Chemical protective gloves (item 154, App H)
Air blow gun (item 158, App H)
Nonmetallic hose assembly (item 168, App H)
Aircraft power unit (item 232, App H)
Adjustable air filtering respirator (item 262, App H)
References:
TM 1-1520-238-CL
Materials/Parts:
Wrapping paper
Brush (item 34, App F)
Cloth (item 52, App F)
Dry cleaning solvent (item 74, App F)
Tape (item 205, App F)
Personnel Required:
67R
Attack Helicopter Repairer
Two persons to assist
152F
Pilot
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
1.70
External power – electrical applied
1.71
External power – air applied
2.2
Access doors T250L, T250R, T290L,
T290R, and L325 opened
13.12
ENCU filter removed
CAUTION
Do this task if environmental control unit (ENCU) malfunctions are reported; or if ENCU compressor
makes unusual sounds. To prevent damage to ENCU, do not clean if temperature is below 32 F
(0 C).
High pressure water/air can damage helicopter components and electrical wiring. Use only hand-
cleaning methods in catwalk and engine-bay areas, or where damage to components or electrical
wiring may occur.
Do not spill solvent on adjacent parts or surfaces, especially under the work area. Mask roller and
ball bearings exposed to solvent. Mask wiring, surface openings, and seams.
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