TM 55-1520-240-23-1
1-64
SERVICE UTILITY SYSTEM APU START ACCUMULATOR
1-64
INITIAL SETUP
Applicable Configurations:
All
Tools:
Aircraft Mechanic’s Tool Kit, NSN 5180-00-323-4692
Source of High-Pressure Compressed Air or
Nitrogen, With 0-3000 PSI Air Gauge and Pressure
Regulator
Torque Wrench, 30-150 Inch-Pounds
Materials:
None
Personnel Required:
CH-47 Helicopter Repairer
Inspector
Equipment Condition:
Battery Disconnected (Task 1-39)
Electrical Power Off
Hydraulic Power Off
Emergency Utility Pressure Valve at Normal (TM
55-1520-240-T)
Cargo Ramp Open and Level (TM 55-1520-240-T)
WARNING
Prior to checking or servicing APU
start accumulator, visually check to
ensure pressure gauge vent hole is
free of all obstructions. There shall
not be anything covering vent hole.
1.
Measure and record outside air temperature.
Use fat gauge (1) in cockpit.
2.
Press depressurization valve (2) on APU
start module (3). Hold valve until sound of
depressurizing has stopped.
Change 3
1-245
