TM 1-1520-238-T-7
11–404
Change 5
11–110. RATE GYRO 2 NO-GO RH AFT CATWALK – APPEARS ON HOD (cont)
11–110
5. Open STAB AUTO AC (A76)CB2 circuit breaker.
Detach J998 from (A640)P1.
Check for open between:
P991–H and J998–1,
P991–P and J998–2.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Go to step 6.
6. Detach P991 from (A638)J3.
Check for short between:
J998–1 and ground,
J998–2 and ground.
Does short exist?
YES
Repair shorted wire between:
J998–1 and P919–B6,
J919–B–6 and P992–H,
J998–2 and P919–B5,
J919–B5 and P992–P.
Go to paragraph 11–88.
NO
Replace STAB CONT UNIT 2
(A638) (TM 1-1520-238-23).
7. Open STAB AUTO AC (A76)CB2 circuit breaker.
Check for open between:
J998–6 and ground,
J998–9 and P991–W,
J998–3 and P991–N
J998–6 and GS–631–F.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Go to step 8.
8. Detach P991 from (A638)J3. Check for short
between J998–9 and ground.
Does short exist?
YES
Repair shorted wire between:
J998–9 and P919–B3,
J919–B3 and P991–W.
Go to paragraph 11–88.
NO
Go to step 9.
9. Check for short between J998–7 and ground.
Does short exist?
YES
Go to step 10.
NO
Go to step 12.
10. Detach P990 from (A638)J2.
Check for short between J998–7 and ground.
Does short exist?
YES
Go to step 11.
NO
Replace STAB CONT UNIT 2
(A638) (TM 1-1520-238-23).
11. Detach P682 from (A69)J3.
Check for short between J998–7 and ground.
Does short exist?
YES
Repair shorted wire between:
J998–7 and P498–A18
(A323)J1–A18 and
(A323)TB1–7–L,
(A323)TB1–7–M and
(A323)J3–B12,
P497–B12 and P682–123,
(A323)TB1–7–J and
(A323)J2–B16,
P494–B16 and P990–B.
Go to paragraph 11–88.
NO
Replace DASEC (A69)
(TM 1-1520-238-23).
12. Check for open between:
J998–7 and P498–A18,
(A323)TB1–7–M and P682–123,
J998–8 and P498–A19,
(A323)TB1–7–P and P682–122,
(A323)J1–A18 and (A323)TB1–7–L,
(A323)J1–A19 and (A323)TB1–7–N,
(A323)TB1–7–J and (A323)J2–B16,
(A323)TB1–7–R and (A323)J2–B17,
P494–B16 and P990–B,
P494–B17 and P990–A.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Replace RATE GYRO 2 (A640)
(TM 1-1520-238-23).
END OF TASK
