TM 1-1520-238-T-7
Change 5
11–403
11–110. RATE GYRO 2 NO-GO RH AFT CATWALK – APPEARS ON HOD
11–110
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
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, T325, T290L T290R,
T250L and
T250R doors 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 J998 from (A640)P1.
Close STAB AUTO AC circuit breaker
(A76)CB2.
Check for 26 VAC between:
J998–1 and J998–3,
J998–2 and J998–3.
Is voltage present?
YES
Go to step 2.
NO
Go to step 5.
2. Detach J998 from (A640)P1.
Check for 26 VAC between J998–4 and J998–5.
Is voltage present?
YES
Go to step 7.
NO
Go to step 3.
3. Open STAB MAN DC (A76)CB6, STAB AUTO
DC (A76)CB3, STAB AUTO AC (A76)CB2, and
ENG WARN (A76)CB52 circuit breakers.
Detach J998 from (A640)P1.
Check for open between:
P991–L and J998–4,
P991–M and J998–5.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Go to step 4.
4. Detach P991 from (A638)J3.
Check for short between:
J998–4 and ground,
J998–5 and ground.
Does short exist?
YES
Repair shorted wire between:
J998–4 and P919–B2,
J919–B2 and P992–L,
J998–5 and P919–B1,
J919–B1 and P992–M,
Go to paragraph 11–88.
NO
Replace STAB CONT UNIT 2
(A638) (TM 1-1520-238-23).
