TM 1-1520-238-23
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Change 5
1.75.
APU OPERATING INSTRUCTIONS – USING EXTERNAL POWER
1.76.1. Description
This task covers:
Operating Instructions.
1.76.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
Personnel Required:
67R
Attack Helicopter Repairer
One person to assist
References:
TM 1-1270-476-20
TM 1-1520-238-T
TM 1-5855-265-20
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
1.134
Maintenance headset con-
nected
TM 1-1520-238-T
Fuel system – visual check
completed
1.73
External power – hydraulic
(utility) applied
WARNING
APU will start with battery switch in OFF if battery is connected. Death or serious injury could
result if APU starts. If injury occurs, seek medical aid.
CAUTION
Only certified personnel are authorized to operate the APU. Failure to comply could result in equip-
ment damage.
1.76.3. Operating Instructions
a. Verify correct main transmission oil level in right sight indicator (para 1.32).
b. Verify correct primary hydraulic fluid level (para 1.34).
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