TM 1-1520-238-T-7
Change 5
11–411
11–116 MAN STAB INDICATORS ON – AUTO MODE DOES NOT ENGAGE AND STAB POS
11–116
INDICATORS DO NOT GO TO 25 2 ND (cont)
31. Detach P991 from (A638)J3.
Check for open between P991–D and P984–B.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Replace STAB CONT UNIT 2
(TM 1-1520-238-23).
32. Detach P983 from (MT17)J1.
Close STAB AUTO AC (A76)CB2 circuit
breaker. Check for –15 2 VDC between
P983–B and ground.
Is voltage present?
YES
Go to step 34.
NO
Go to step 33.
33. Detach 987 from (A637)J3.
Check for open between P987–D and P983–B.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Replace AIRSPEED
TRANSDUCER NO. 2 (MT18)
(TM 1-1520-238-23).
34. Attach P987 to (A637)J3.
Detach P986 from (A637)J2.
Close STAB AUTO AC (A76)CB2 circuit
breaker. Check for 0.4 VDC between P986–B
and P986–A.
YES
Repair open wire.
Go to paragraph 11–88.
NO
Replace AIRSPEED
TRANSDUCER NO. 2 (MT18)
(TM 1-1520-238-23).
Is voltage present?
YES
Replace RATE GYRO NO. 1
(A639) (TM 1-1520-238-23).
NO
Replace AUTO MAN PWR relay
(A323)XK1–1/2, or
AUTO/MAN PWR relay
(A329)XK1–1/2, or
MAN MODE LOCK SELECT
relay (A329)XK1–3/4, or
APPROACH 1 LIGHT relay
(A329)XK1–7, or
STAB CONT UNIT 1 (A637), or
STAB CONT UNIT 2 (A638)
(TM 1-1520-238-23).
END OF TASK
