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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Bank angle limits or rates are not correct for a mode or submode Mode switch does not return to MAN when on localizer and TURB is selected VOR/LOC lights do not indicate armed or engaged mode Mode select switch does not return to MAN when CWS used with on-course submode Roll channel Roll channel or control panel Roll channel Roll channel or control panel Conduct self-test of roll channel. If roll channel fails self-test, roll channel is faulty Replace roll channel. Engage roll and pitch channels, select ILS frequency and VOR/LOC. Select TURB. If fault is not corrected, control panel is faulty Replace roll channel and test lights (Refer to Test VOR/LOC Mode in Adjustment/Test). If fault is not corrected, see Autopilot Annunciator Trouble Shooting Chart Engage roll channel and pitch channel. Select an ILS frequency. Select AUPO APP. Change from ILS to a VOR frequency. If the mode select switch returns to MAN, the roll channel is faulty. If the mode select switch does not return to MAN, the control panel is faulty Replace roll channel Replace roll channel. Replace autopilot control panel Replace roll channel Replace roll channel. Replace autopilot control panel
F. Autopilot Mode Select Trouble Shooting Chart
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Mode select switch does not remain in VOR/LOC, AUTO APP Autopilot accessory box (if NAV mode circuit interrupter is installed) or roll channel Control panel Replace autopilot accessory box. Engage roll channel and select VOR/LOC. If mode select switch remains in VOR/LOC, autopilot accessory box was faulty. If switch does not remain in VOR/LOC, roll channel may be faulty If replacing roll channel does not correct fault, control panel is faulty Replace autopilot accessory box. Replace roll channel Replace control panel
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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Pitch mode switch does not remain in TURB Pitch mode switch does not remain in ALT HOLD (ADC known good) Control panel or pitch channel Pitch channel or control panel Engage pitch channel. Select TURB. If switch does not remain in TURB, control panel may be faulty. If replacing control panel does not correct fault, pitch channel is faulty Replace pitch channel. Engage pitch channel and select ALT HOLD. If switch remains in ALT HOLD, pitch channel was faulty. If switch returns to OFF, control panel is faulty Replace control panel. Replace pitch channel. Replace pitch channel. Replace autopilot control panel.
G. Autopilot Hydraulic Power Pack Trouble Shooting Chart
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Roll or pitch channel inoperative Roll or pitch channel intermittent (roll and pitch channel known good) Roll or pitch channel or solenoid valve Autopilot accessory box or control panel Engage channel and move control wheel/column. If control surface does not move, channel is faulty. If fault persists after channel is replaced, solenoid valve on B power pack is faulty Replace autopilot accessory box. Observe if autopilot warning lights flash but channel is engaged. Press the warning light. The light should extinguish. Disengage channel and reengage, if lights continue to flash, control panel is faulty. Replace pitch or roll channel Replace solenoid valve (Ref 22-11-11, Aileron Solenoid Valve or 22-11-31, Elevator Solenoid Valve) Replace autopilot accessory box. Replace control panel
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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Roll or pitch channel appears to have not mechanically disengaged from power pack (hydraulic pressure on packs) Ailerons move to limits when roll channel is engaged (roll channel known good) Elevators move to limits when pitch channel is engaged (pitch channel known good) Solenoid valve Position transducer or transfer valve Position transducer or transducer transfer valve Remove hydraulic power from control systems (Ref Chapter 27, Flight Controls). Manually cycle control surfaces several times. Energize hydraulic system B. Manually move control wheel or column. If control surfaces cannot be moved or are difficult to move, system B solenoid valve is leaking. Engage roll channel. If ailerons move to limits, check for voltage between TP-3 and TP-4 on roll channel. If no voltage position transducer is faulty. If voltage is available, transfer valve is faulty Engage pitch channel. If elevators move to limits, check for voltage at TP-10 on pitch channel. If not voltage, position transducer is faulty. If voltage is available, transfer valve is faulty Replace solenoid valve (Ref 22-11-11, Aileron Solenoid Valve or 22-11-31, Elevator Solenoid Valve). Replace aileron position transducer (Ref 22-11-231, Aileron Position Transducer). Replace aileron transfer valve (Ref 22-11-21, Aileron Transfer Valve). Replace elevator position transducer (Ref 22-11-241, Elevator Position Transducer). Replace elevator transfer valve (Ref 22-11-41, Elevator Transfer Valve).
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