TM 55-1520-240-23-1
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SERVICE UTILITY SYSTEM RESERVOIR PRESSURIZATION ACCUMULATOR
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INITIAL SETUP
Applicable Configurations:
All
Tools:
Aircraft Mechanics Tool Kit, NSN 5180-00-323-4692
Source of High Pressure Compressed Air or Nitrogen,
with 0-3000 Psi Air Gage and Pressure Regulator
Torque Wrench, 30 to 150 Inch Pounds
Materials:
Lockwire (E231)
Personnel Required:
Medium Helicopter Repairer
Inspector
Equipment Condition:
Battery Disconnected (Task 1-39)
Electrical Power Off
Hydraulic Power Off
Pylon Right Access Door Open (Task 2-2)
Cargo Ramp Open and Level (TM 55-1520-240-T)
1.
Measure and record outside air temperature.
Use fat gage (1) in cockpit.
2.
Set UTILITY RESERVOIR DEPRESSURIZE
valve (2) to OPEN.
3.
Press and hold depressurization valve (3) on
APU start module (4) until accumulators have
discharged completely.
4.
Release valve (3).
5.
Set UTILITY RESERVOIR DEPRESSURIZE
valve (2) to NORMAL.
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