TM 1-1520-238-T-7
11–376
Change 5
11–91. STAB MAN DC CIRCUIT BREAKER – DOES NOT STAY CLOSED
11–91
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Extractor, Relay
CTJ-RO6
Personnel Required:
68X
Armament/Electrical Systems Repairer
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. Does STAB MAN DC circuit breaker (A76)CB6
open only when PLT NU/ND switch is pressed to
NU or ND.
YES
Go to step 11.
NO
Go to step 2.
2. Open STAB MAN DC (A76)CB6, STAB AUTO
DC (A76)CB3, STAB AUTO AC (A76)CB2, and
ENG WARN (A76)CB52 circuit breakers. Detach
P2 from (A402)J2. Check for short between
P2–g and ground.
Does short exist?
YES
Refer to TM 1-1520-238-T-6
to troubleshoot circuit protection
system (ac essential bus 1 –
pilot station).
NO
Go to step 3.
3. Detach P427 from (A402)J28.
Check for short between (A402)J2–g and
ground.
Does short exist?
YES
Go to step 4.
NO
Go to step 8.
4. Detach P437 from (A402)J25.
Check for short between (A402)J2–g and
ground.
Does short exist?
YES
Repair shorted wire between
(A402):
J2–g and TB2–23–A,
J25–A and TB2–23–D,
J25–D and TB2–23–F,
TB2–23–E and TB2–24–A,
TB2–24–D and J28–E,
TB2–24–E and J28–F,
TB2–24–B and J28–A,
TB2–24–C and J28–B.
Go to paragraph 11–88.
NO
Go to step 5.
5. Check for short between P437–D and ground.
Does short exist?
YES
Go to step 6.
NO
Go to step 7.
6. Detach J994 from (A641)P1.
Check for short between P437–D and ground.
Does short exist?
YES
Repair shorted wire between
P437–D and J994–B.
Go to paragraph 11–88.
NO
Replace CPG MAN STAB
CONT SW (A641)
(TM 1-1520-238-23).
7. Detach J993 from (A641)P1.
Check for short between P437–A and ground.
Does short exist?
YES
Repair shorted wire between
P437–A and J993–B.
Go to paragraph 11–88.
NO
Replace pilot MAN STAB CONT
SW (A641)
(TM 1-1520-238-23).
8. Check for short between:
P427–E and ground,
P427–F and ground.
Does short exist?
YES
Go to step 9.
NO
Go to step 10.
