TM 1-1520-238-T-5
7–101
7–25.
UTIL HYD INDICATOR – DOES NOT INDICATE 3000 PSI (AGPU OPERATING)
7–25
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer (2)
References:
TM 1-1520-238-T-6
TM 1-1520-238-23
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Hydraulic system
leak check –
completed
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 EMERG HYD circuit breaker.
Is circuit breaker closed?
YES
Go to step 2.
NO
Go to paragraph 7–43.
2. Check for 28 VDC at P238–11.
Is voltage present?
YES
Go to step 4.
NO
Go to step 3.
3. Check for 28 VDC at (A76)J1–m.
Is voltage present?
YES
Repair open wire between
P463–m and P238–11.
Go to paragraph 7–21.
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot circuit protection
system (dc emergency bus –
pilot station)
4. Check for open between P238–12 and ground.
Does open exist?
YES
Repair open wire between
P238–12 and GS631–A.
Go to paragraph 7–21.
NO
Go to step 5.
5. Verify AGPU pressure for 3000 psi. Check for
4.2 VDC between P265–E and P265–F.
Is voltage present?
YES
Replace dual hydraulic pressure
indicator (TM 1-1520-238-23).
NO
Go to step 6.
6. Check for open between:
P265–E and P238–22,
P265–F and P238–21.
Does open exist?
YES
Repair open wire.
Go to paragraph 7–21.
NO
Go to step 7.
