TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Roll channel does not Roll channel Check meter on front of roll Replace roll channel
engage (air data channel. If meter does not
computer vertical read in red, roll channel is
gyro, directional gyro faulty
and power ok) Aileron force limiter Autopilot accessory box or control panel Roll CWS force transducer Conduct self-test of roll channel. If channel falls self-test, roll channel is faulty Disconnect D443 on force limiter; apply P8-v dc to pin 1 and ground pin 2 of force limiter. Check for continuity between pins 3 and 4. If no continuity, force limiter is faulty Replace autopilot accessory box. Attempt to engage roll channel. If roll channel engages, accessory box was faulty. If roll channel does not engage, autopilot control panel is probably faulty Check roll control wheel steering transducer null voltage (Refer to 22-11-111, Roll Control Wheel Steering Force Transducer.) If voltage unsatisfactory, transducer is faulty Replace aileron force limiter (Refer to 22-11-131, Aileron Force Limiter). Replace autopilot accessory box. Replace autopilot control panel Adjust or replace roll control wheel steering force transducer (Refer to 22-11-111, Roll Control Wheel Steering Force Transducer).
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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Ailerons kick sharply on engagement NOTE: Ailerons may kick when airplane on ground due to wings leveling circuit. Maximum allowable control wheel rotation is 6 degrees. Roll channel disengages intermittently (interlocks known good) Roll channel inoperative or intermittent Roll channel Roll channel or control panel. Roll channel Autopilot accessory box Control panel Conduct self-test of roll channel. If roll channel fails self-test, roll channel is faulty. Replace roll channel. Engage roll channel. If fault persists, control panel is probably faulty. Engage roll channel and move control wheel. If ailerons do not respond, see Hydraulic Power Pack Component, Trouble Shooting Chart. If system does not operate, roll channel is probably faulty. If roll channel has intermittent operation, replace autopilot accessory box If intermittent fault persists, autopilot control panel is faulty Replace roll channel. Replace roll channel. Replace control panel. Replace roll channel. Replace autopilot accessory box Replace control panel
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TROUBLE PROBABLY CAUSE ISOLATION PROCEDURE REMEDY
Roll axis stabilization is poor (vertical gyro known good) Roll channel does not respond to control wheel steering inputs Roll control wheel steering oversensitive or erratic Roll channel Roll channel or control wheel steering transducer Control wheel detent breakout forces out of tolerance (roll force transducer misrigged) Conduct self-test of roll channel. If roll channel fails self-test, roll channel is faulty Conduct roll channel self-test. If roll channel fails self-test 3 or more, roll channel is faulty. If roll channel ok, roll control wheel transducer is faulty With autopilot disengaged and hydraulic pressure off apply 90 pound-inches of torque on control wheel while monitoring at roll channel TP-18. Check voltage is between 4.0 and 6.0 VAC Replace roll channel Replace roll channel. Adjust or replace roll CWS transducer (Ref 22-11-111, Roll Control Wheel Steering Force Transducer) Voltage erratic. Replace roll channel
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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Force limiter forces or bank limits are not correct for cam-out Airplane rolls wings level when in attitude hold and bank angle exceeds 5 degrees Airplane does not return to wings level when bank angle less than 5 degrees and in heading hold mode Force limiter Roll channel Roll channel Conduct aileron force limiter test (Refer to 22-11-131, Aileron Force Limiter.) If forces and limits are not correct, force limiter is faulty Conduct self-test of roll channel. If roll channel fails self-test 2 or more, roll channel is faulty Conduct self-test of roll channel. If roll channel fails self-test 2 or more, roll channel is faulty Replace aileron force limiter (Refer to 22-11-131, Aileron Force Limiter) Replace roll channel Replace roll channel.
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