TM 55-1520-240-T
15-4.8 APU HYDRAULIC STARTING SYSTEM
OPERATIONAL CHECK
15-4.8
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 15-
4.7)
TASK
RESULT
1. Check APU start accumulator gage
Gage (1) shalI indicate between 2850 and
(1).
3100 psi. If it does not, use hand pump to
charge accumulator. If gage still does not in-
dicate between 2850 and 3100 psi, go to task
15-4.9.
2. Start APU. Refer to task 15-1.5.
APU shall begin to motor and accelerate
to running speed within 30 seconds.
UTILITY HYDRAULICS indicator (2) shall
indicate 3200 to 3500 psi. If indicator
does not indicate 3200 to 3500 psit stop
apu and go to task 7-2.4. If APU does
not motor, go to task 15-4.10. If APU
motors but does not start and ESU bite
task 15-4.11.
3. Stop APU. Refer to task 15-1.5.
FOLLOW-ON MAINTENANCE:
TM 55-1520-240-23
G O T O N E X T P A G E
15-76
Change 8
