TM 55-1520-240-T
15-4.7 APU HYDRAULIC STARTING SYSTEM VISUAL CHECK
15-4.7
INITIAL SETUP
Applicable Configurations:
All
Tools:
Aircraft Mechanic’s Tool Kit,
NSN 5180-00-323-4692
Materials:
None
Personnel Required:
Medium Helicopter Repairer
References:
TM 55-1520-240-23
Equipment Condition:
TM 55-1520-240-23:
Electrical Power Off
Battery Disconnected
Hydraulic Power Off
Right Aft Transmission
Baffle Open
Cargo Ramp Operational Level
(Task 7-3.4)
TASK
RESULT
1. Check APU start module accumulator
If accumulator (1) or accumulator gage
(l).
(2) is damaged, replace accumulator.
2. Check APU start module (3).
If any tube to module (3) is loose or
damaged, tighten or replace it as
required. If electrical connector to
module is loose or damaged, tighten or
replace it as required. If wiring to
connector is damaged, repair or replace
it as required.
3. Check APU start accumulator gage
If gage (4) is loose or damaged, tighten
(4).
or replace it as required.
4. Check APU start accumulator (5).
If accumulator (5) is loose or damaged,
tighten or replace it as required. If any
tube to accumulator is loose or damaged,
tighten or replace it as required.
5. Check APU motor pump (6).
If pump (6) is loose or damaged, tighten
or replace it as required. If any hose to
pump is loose or damaged, tighten or
replace it as required.
FOLLOW-ON MAINTENANCE:
None
END OF TASK
Change 8
15-75
