TM 1-1520-238-T-5
7–77
7–20.
PRI HYD INDICATOR – DOES NOT INDICATE 3000 PSI (APU OPERATING)
7–20
Tools:
Nomenclature
Part Number
Tool Kit, Aircraft
SC518099CLA01
Mechanic’s
Service Unit,
E159-1000
Hydraulic Fluid
Personnel Required:
67R
Attack Helicopter Repairer
References:
TM 1-1520-238-T-4
TM 1-1520-238-T-8
TM 1-1520-238-23
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
APU operating
WARNING
Turn off power before detaching or
attaching wires and connectors. High
current 28 VDC or 115 VAC is present.
Failure to do so could result in death or
serious injury.
1. Check APU shaft 7.
Is APU 7 shaft turning?
YES
Go to step 2.
NO
Refer to TM 1-1520-238-T-8 to
troubleshoot APU system.
2. Shut down APU (TM 1-1520-238-23). Remove
primary hydraulic pump.
Is primary hydraulic pump shaft sheared?
YES
Replace primary hydraulic pump
(TM 1-1520-238-23).
NO
Refer to TM 1-1520-238-T-4 to
troubleshoot drive system.
END OF TASK
