TM 1-1520-238-T-7
11–436
Change 5
11–133. PILOT ND/NU SWITCH DOES NOT MOVE STAB UP – STAB AUTO AC (CB2) AND STAB
11–133
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:
P2 from (A402)J2,
P437 from (A402)J25,
P427 from (A402)J28.
Check for open between:
STAB MAN DC (A76)CB6 and P2–g,
(A402)J2–g and (A402)TB2–23–A,
(A402)TB2–23–D and (A402)J25–A,
(A402)P437–A and J993–B,
(A402)TB2–23–E and (A402)TB2–24–A.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Go to step 2.
2. Hold pilot collective ND/NU switch on to NU.
Check for open between (A641):
J993–B and J993–A.
Does open exist?
YES
Replace pilot MAN STAB switch
(TM 1-1520-238-23).
NO
Go to step 3.
3. Detach P1077. Check for open between (A329):
TB1–4–A and J1–v,
P1077–v and GS4–A.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Go to step 4.
4. Check for open between:
(A641)J993–A and P437–B,
(A402)J25–B and (A402)TB2–21–D,
(A402)TB2–21–A and (A402)J28–G,
(A402)P427–G and (A323)P485–R,
(A323)J7–R and (A323)XK1–3–X1,
(A323)XK1–3–X2 and GS–4–A.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Replace MAN CONT NOSE UP
relay (A323)K1–3
(TM 1-1520-238-23).
END OF TASK
