TM 55-1520-240-T
7-8.3 APU HYDRAULIC STARTING SYSTEM OPERATIONAL CHECK
INITIAL SETUP
Applicable Configurations:
All
Tools:
None
Materials:
None
Personnel Required:
Medium Helicopter Repairer (2)
References:
TM 55-1520-240-23
Equipment Condition:
TM 55-1520-240-23:
Battery Connected
Electrical Power Off
Hydraulic Power Off
Visual Check of Apu Hydraulic
Starting System Performed (Task 7-8.2)
TASK
R E S U LT
1. Check APU start accumulator
2. Start APU. Refer to task 15-1.4.
3. Stop APU. Refer to task 15-1.4.
gage (1).
Gage (1) shall indicate at least 3000 psi. If it does
not, use hand pump to charge accumulator. If
gage still does not indicate at least 3000 psi, go to
task 7-8.4.
APU shall begin to motor and accelerate to run-
ning speed within 30 seconds. UTILITY HY-
DRAULICS indicator (2) shall indicate 3200 to
3500 psi. If indicator does not indicate 3200 to
3500 psi, stop apu and go to task 7-2.4. If APU
does not motor, go to task 7-8.5. If APU motors
but does not start, go to task 15-1.9.
FOLLOW-ON MAINTENANCE:
TM 55-1520-240-23
7-8.3
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