TM 1-1520-238-T-7
11–434
Change 5
11–132. STAB POS NOT 19 2 NU FOR 70 KNOTS AND COLLECTIVE CENTERED (cont)
11–132
8. Check for open between P984–E and ground.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Go to step 9.
9. Check for open between:
P984–D and P990–D,
P984–C and P990–E.
Does open exist?
YES
Repair open wire between:
P984–D and P498–A15,
(A323)J1–A15 and
(A323)TB1–5–G,
(A323)TB1–5–H and
(A323)J2–B13,
P494–B13 and P990–D,
P984–c and P498–A16,
(A323)J1–A16 and
(A323)TB1–5–J,
(A323)TB1–5–K and
(A323)J3–B14,
P494–B14 and P990–E.
Go to paragraph 11–88.
NO
Replace AIRSPEED
TRANSDUCER 2 (MT18)
(TM 1-1520-238-23).
10. Detach P983 from (MT17)J1.
Close STAB AUTO AC (A76)CB2 circuit
breaker. Check for +15 2 VDC between
P983–A and ground.
Is voltage present?
YES
Go to step 12.
NO
Go to step 11.
11. Detach 987 from (A637)J3.
Check for open between:
P987–U and P983–A.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Replace STAB CONT UNIT 1
(A637) (TM 1-1520-238-23).
12. Check for short between P983–D and ground.
Does short exist?
YES
Go to step 13.
NO
Go to step 15.
13. Detach P986 from (A637)J986.
Check for short between P983–D and ground.
Does short exist?
YES
Go to step 14.
NO
Replace STAB CONT UNIT 2
(A638) (TM 1-1520-238-23).
14. Detach P682 from (A69)J3.
Check for short between P983–D and ground.
Does short exist?
YES
Repair shorted wire between:
P983–D and P491–A5,
(A323)J6–A5 and
(A323)TB3–1–G,
A323)TB3–1–F and
(A323)J3–B3,
P497–B3 and P682–116,
(A323)TB3–1–H and
(A323)J3–A19,
P497–A19 and P986–D.
Go to paragraph 11–88.
NO
Replace DASEC (A69)
(TM 1-1520-238-23).
