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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Pitch axis stabilization is poor (Vertical gyro known good) Pitch channel does not respond to control wheel steering inputs Pitch control wheel steering oversensitive or erratic Pitch channel Pitch channel, CADC or control wheel steering transducer Control column detent breakout forces out of tolerance (pitch force transducers misrigged) Conduct self-test of pitch channel. If pitch channel fails self-test pitch channel is faulty Conduct pitch channel self-test. If pitch channel fails self-test 2 or more, push on control column and check for 1.3 to 2.4-v ac at TP-13 on pitch channel. If voltage, pitch channel is faulty. If no voltage, CADC is faulty. If pitch channel ok, control wheel steering transducer is faulty Engage autopilot. Apply 14-pound push then pull to control column while monitoring voltage at pitch channel TP-13. Check voltage is between 1.3 and 2.4 VAC If voltage incorrect disconnect captain's force transducer connector. Apply 28-pound push then pull to control column while monitoring voltage at pitch channel TP-13, Check voltage is between 1.3 and 2.4 VAC If voltage incorrect repeat above procedure with captains force transducer connected and first officers force transducer disconnected Replace pitch channel Replace pitch channel Adjust or replace pitch CWS transducer (Ref 22-11-91, Pitch Control Wheel Steering Force Transducer) Voltage erratic. Replace pitch channel If voltage correct replace first officers pitch CWS force transducer (Ref 22-11-91) If voltage correct replace captain is pitch CWS force transducer (Ref 22-11-91)
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C89480 C89388
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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Glide slope annunciator lights do not indicate armed or engaged modes Mode selector switch does not return to MAN when CWS used on glide slope Autopilot accessory box Pitch channel or roll channel Replace autopilot accessory box and test lights (Refer to Test Approach Mode in Adjustment/Test). If fault not corrected, see Autopilot Annunciator Trouble Shooting Chart Replace pitch channel and test system. (Refer to Test AUTO/APP Mode Control in Adjustment/Test.) If fault is not corrected, roll channel is faulty Replace autopilot accessory box Replace pitch channel. Replace roll channel
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C. Stabilizer Trim Trouble Shooting Chart D. Roll Channel Engage Trouble Shooting Chart E. Roll Channel Operation Trouble Shooting Chart
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Stabilizer trim warning light illuminated (flight fault) (interlocks ok) Stabilizer drives in only one direction Pitch channel or stabilizer trim servo Elevator power control unit (PCU) Pitch channel or stabilizer trim servo Stabilizer trim limit switches Replace pitch channel and engage pitch channel. Close autopilot stabilizer trim circuit breakers. Move control column forward or back and neutralize. Stabilizer should drive to maximum nose up or nose down position. If stabilizer does not move, stabilizer trim servo is faulty Replace elevator PCU and check for sufficient actuator force output with autopilot input per overhaul manual instructions Repeat above isolation procedure Manually trim stabilizer to 3 units of trim. Open autopilot trim cutout switch. Check continuity through S144 and S145 limit switches. No continuity, limit switch is faulty. NOTE: Terminals 2 and 5 are stowed. Replace pitch channel. Replace autopilot stabilizer trim servo (Ref 22-11-81, Autopilot Stabilizer Trim Servo) Replace elevator PCU Replace pitch channel. Replace autopilot stabilizer trim servo (Ref 22-11-81, Autopilot Stabilizer Trim Servo) Replace stabilizer trim limit switch
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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
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