TM 1-1520-238-T-7
11–267
11–47. PILOT AND CPG BUCS FAIL INDICATORS–- ARE LIGHTED WITH CPG BUCS
11–47
SELECT TRIGGER SWITCH RELEASED
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer
References:
TM 1-1520-238-T-6
TM 1-1520-238-23
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
R295 door open
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 for 28 VDC at P686–113.
Does short exist?
YES
Go to step 3.
NO
Go to step 2.
2. Check for 5 to 30 VDC at P20–t.
Does short exist?
YES
Refer to TM 1-1520-238-T-6 to
troubleshoot pilot
caution/warning system.
NO
Go to step 4.
3. Detach P686 and P413. Check for short
between J108–i and J108–h.
Does short exist?
YES
Repair shorted wire between:
J108–i and P234 SP1,
J108–h and J459–A1,
P234 SP1 and P413–B13,
P234 SP1 and J447–B19,
P459–A1 and P686–13,
P447–B19 and P686–54.
Go to paragraph 11–23.
NO
Replace CPG BUCS select
trigger switch
(TM 1-1520-238-23).
4. Check for short between:
P683–115 and ground,
P20–t and ground.
Does short exist?
YES
Repair shorted wire between:
P20–t and P20 SP1,
P456–A12 and P20 SP1,
P31–t and P20 SP1,
P456–A12 and P683–115.
Go to paragraph 11–23.
NO
(ACA) Replace DASEC
(TM 1-1520-238-23).
(ACB) Go to step 5.
5. (ACB) Detach filter adapter A706. Check for
short between A706–115 and case.
Does short exist?
YES
Replace filter adapter
(TM 1-1520-238-23).
NO
Replace DASEC
(TM 1-1520-238-23).
END OF TASK
