TM 1-1520-238-T-7
Change 5
11–376.1
11–91. STAB MAN DC CIRCUIT BREAKER – DOES NOT STAY CLOSED (cont)
11–91
9. Detach P485 from (A323)J7.
Check for short between:
P427–E and ground,
P427–F and ground.
Does short exist?
YES
Repair shorted wire between:
P427–E and P485–N,
P427–F and P485–P.
Go to paragraph 11–88.
NO
Repair shorted wire between
(A323):
J7–N and XK1–3–A1,
J7–P and XK1–3–B1,
go to paragraph 11–88, or
replace MAN CONT NOSE UP
relay (A323)K1–3
(TM 1-1520-238-23).
10. Detach P1077 from (A329)J1.
Check for short between:
P427–A and ground,
P427–B and ground.
Does short exist?
YES
Repair shorted wire between:
P427–A and P1077–k,
P427–B and P1077–h.
Go to paragraph 11–88.
NO
Repair shorted wire between
(A329):
J1–k and XK1–5–B1,
J1–h and TB1–5–A,
TB1–5–E and XK1–5–A1,
TB1–5–C and XK1–3/4–D1.
Go to paragraph 11–88, or
replace:
MAN CONT NOSE DOWN relay
(A329)K1–5, or
MAN MODE LOCK SEL relay
(A329)K1–3/4
(TM 1-1520-238-23).
11. Open STAB MAN DC (A76)CB6, STAB AUTO
DC (A76)CB3, STAB AUTO AC (A76)CB2, and
ENG WARN (A76)CB52 circuit breakers.
Detach (A402):
P437 from J25,
P427 from J28,
P431 from J27.
Check for short between:
J25–C and ground,
J25–F and ground.
Does short exist?
YES
Repair shorted wire between
(A402):
J25–C and TB2–21–F,
J25–B and TB2–21–D,
TB2–21–A and J28–G,
J25–F and TB2–25–E,
J25–E and TB2–25–A,
TB2–25–C and J28–H,
TB2–21–B and J27–B10.
Go to paragraph 11–88.
NO
Go to step 12.
12. Check for short between:
P437–C and ground,
P437–F and ground.
Does short exist?
YES
Go to step 13.
NO
Go to step 14.
13. Detach J994 from (A641)P1.
Check for short between:
P437–C and ground,
P437–F and ground.
Does short exist?
YES
Repair shorted wire between:
P437–C and J994–A,
P437–F and J994–D.
Go to paragraph 11–88.
NO
Replace CPG MAN STAB
CONT switch (A641)
(TM 1-1520-238-23).
