TM 1-1520-238-T-7
11–270
11–50.
RTR BRK CIRCUIT BREAKER – DOES NOT STAY CLOSED WITH BUCS TST
11–50
SWITCH SET TO PLT
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer
References:
TM 1-1520-238-23
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. On pilot ASE panel, hold BUCS TST switch in
PLT position. Check for short between (A137):
J1–A6 and J1–B5.
Does short exist?
YES
Replace pilot ASE panel
(TM 1-1520-238-23).
NO
Go to step 2.
2. Detach P688. Check for short between
P170–A6 and ground.
Does short exist?
YES
Go to step 3.
NO
(ACA) Replace DASEC
(TM 1-1520-238-23).
(ACB) Go to step 5.
3. Detach P413. Check for short between
P170–A6 and ground.
Does short exist?
YES
Repair shorted wire between
P170–A6 and P413–A13.
Go to paragraph 11–23.
NO
Go to step 4.
4. Detach P472. Check for short between
(A326)J10–A13 and ground.
Does short exist?
YES
Repair shorted wire between
(A326):
J10–A13 and TB1–19–E,
J10–A14 and TB1–19–F
J10–B8 and TB1–19–D,
J10–B7 and TB1–19–B,
J15–A3 and TB1–19–C,
J15–A4 and TB1–19–A.
Go to paragraph 11–23.
NO
Go to step 6.
5. (ACB) Detach filter adapter A708. Check for
short between A708–121 and case.
Does short exist?
YES
Replace filter adapter
(TM 1-1520-238-23).
NO
Replace DASEC
(TM 1-1520-238-23).
6. Check for short between P413–A14 and ground.
Does short exist?
YES
Repair shorted wire between:
P413–A14 and J459–B5,
P459–B5 and P688–121.
Go to paragraph 11–23.
NO
Go to step 7.
7. Check for short between P413–B7 and ground.
Does short exist?
YES
Go to step 8.
NO
Go to step 11.
8. Detach P1 from J272. Check for short between
P413–B7 and ground.
Does short exist?
YES
Repair shorted wire between
P413–B7 and J272–3.
Go to paragraph 11–23.
NO
Go to step 9.
