TM 1-1520-238-T-7
Change 3
10–117
10–25. BOOST PMP ON INDICATOR – IS LIGHTED WITH BOOST SWITCH SET TO OFF
10–25
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer
One person to assist
References:
TM 1-1520-238-T-6
TM 1-1520-238-23
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. Have assistant check boost pump for operating
noise.
Is boost pump operating?
YES
Go to step 4.
NO
Go to step 2.
2. Check for open between P444-B17 and
P444-A1.
Does open exist?
YES
Go to step 3.
NO
Replace boost pump pressure
switch (TM 1-1520-238-23).
3. Check for 28 VDC at P18-96.
Is voltage present?
YES
Go to step 5.
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot pilot
caution/warning system.
4. Check for 28 VDC at P242-A.
Is voltage present?
YES
Go to step 6.
NO
Replace boost pump air valve
(TM 1-1520-238-23).
5. Check for short between:
P18-96 and P438-B19,
(A402)J15-B19 and (A402)TB2-13-T,
(A402)TB2-13-W and (A402)J31-B17.
Does short exist?
YES
Repair shorted wire.
Go to paragraph 10–17.
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot pilot
caution/warning system.
6. Check for 28 VDC at P174-A17.
Is voltage present?
YES
Replace CPG FUEL panel
(TM 1-1520-238-23).
NO
Replace pilot FUEL panel
(TM 1-1520-238-23).
END OF TASK
