TM 1-1520-238-T-7
Change 5
11–391
11–102. ND/NU SET TO NU – BOTTOM PISTON FAILS TO MOVE STABILATOR (TOP STABILATOR
11–102
ACTUATOR EXTENDS FULLY)
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
Access provisions –
L325 door open
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. Detach P996 from (L46)J998. Momentarily press
pilot collective NU/ND switch to NU. Check for
28 VDC at P996–J(HI) and P996–K(LO).
Is voltage present?
YES
Replace bottom STAB
ACTUATOR (L46)
(TM 1-1520-238-23).
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
P427 from (A402)J28.
Check for open between (A402):
TB2–24–D and J28–E.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Go to step 3.
3. Detach P485 from (A323)J7.
Check for open between P427–E and P485–N.
Is voltage present?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Go to step 4.
4. Check for open between (A323):
J7–N and XK1–3–A1.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Go to step 5.
5. Check for open between (A323):
XK1–3–A2 and XK1–1/2–A3.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Go to step 6.
6. Check for open between (A323):
XK1–1/2–A2 and J7–F.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Go to step 7.
7. Check for open between P485–F and P996–J.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Go to step 8.
8. Check for open between P996–K and P485–A.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Go to step 9.
