TM 1-1520-238-T-7
Change 5
11–437/(11–438 blank)
11–134. PILOT ND/NU SWITCH DOES NOT MOVE STAB DOWN – STAB AUTO AC (CB2) AND STAB 11–134
AUTO DC (CB3) CIRCUIT BREAKERS OPEN
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
One person to assist
References:
TM 1-1520-238-23
Equipment Conditions:
Ref
Condition
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. Open STAB MAN DC (A76)CB6 and STAB
MAN AC (A76)CB7 circuit breakers.
Detach:
P437 from (A402)J25,
P427 from (A402)J28,
J993 from (A641)J1.
Hold pilot ND/NU to ND.
Check for open between (A641):
J993–B and J993–D.
Does open exist?
YES
Replace pilot MAN STAB switch
(TM 1-1520-238-23).
NO
Go to step 2.
2. Check for open between:
J993–D and P437–E,
(A402)J25–E and (A402)TB2–25–A,
(A402)TB2–25–C and (A402)J28–H,
P427–H and P1077–m,
(A329)J1–m and (A329)TB1–5–B,
(A329)TB1–5–D and (A329)XK1–5–X1,
(A329)XK1–5–X2 and (A329)TB1–4–B.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Replace (A329)K1–5 MAN
CONT NOSE DOWN relay
(TM 1-1520-238-23).
END OF TASK
