TM 1-1520-238-T-7 11–410.4 Change 5 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) 22. Detach P984 from (MT18)J1. Check for short between: P991–D and ground, P991–U and ground. Does short exist? YES Repair shorted wire. Go to paragraph 11–88. NO Replace AIRSPEED TRANSDUCER NO. 2 (MT18) (TM 1-1520-238-23). 23. Detach P987 from (A637)J3. Check for short between: P987–D and ground, P987–U and ground. Does short exist? YES Go to step 24. NO Go to step 25. 24. Detach P983 from (MT17)J1. Check for short between: P987–D and ground, P987–U and ground. Does short exist? YES Repair shorted wire. Go to paragraph 11–88. NO Replace AIRSPEED TRANSDUCER NO. 1 (MT17) (TM 1-1520-238-23). 25. Attach P991 to (A638)J3. Detach P990 from (A638)J2. Close STAB AUTO AC (A76)CB2 circuit breaker. Check for 2.6 VDC maximum between P990–D (HI) and P990–E (LO). Is voltage present? YES Go to step 27. NO Go to step 26. 26. Open STAB AUTO AC (A76)CB2 circuit breaker. Check for open between P991–D and P984–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). 27. Attach P987 to (A637)J3. Detach P986 from (A637)J2. Close STAB AUTO AC (A76)CB2 circuit breaker. Check for 2.6 VDC maximum between P986–D (HI) and P986–E (LO). Is voltage present? YES Go to step 29. NO Go to step 28. 28. Open STAB AUTO AC (A76)CB2 circuit breaker. 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. 1 (MT17) (TM 1-1520-238-23). 29. Attach P991 to (A638)J3. Detach P990 from (A638)J2. Close STAB AUTO AC (A76)CB2 circuit breaker. Check for 0.4 VDC between P990–B and P990–A. Is voltage present? YES Replace RATE GYRO NO. 2 (A640) (TM 1-1520-238-23). NO Go to step 30. 30. Detach P987 from (MT18)J1. Close STAB AUTO AC (A76)CB2 circuit breaker. Check for –15 2 VDC between P984–B and ground. Is voltage present? YES Go to step 32. NO Go to step 31.