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H. Autopilot Annunciator Trouble Shooting Chart I. Autopilot Disengage Warning Lights Trouble Shooting Chart
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Both captain's and first officer's VOR/LOC lights do not indicate armed or engaged modes (lights known good) Both captain's and first officer's GLIDE SLOPE lights do not indicate armed or engaged modes Either captain's or first officer's VOR/LOC and GLIDE SLOPE lights do not indicate armed and engaged modes Either captain's or first officer's NAV, VOR/LOC and GLIDE SLOPE lights do not dim automatically Both captain’s and first officer’s NAV lights do not indicate when NAV is selected on autopilot control panel  Roll channel or flight instrument accessory box Autopilot accessory box or pitch channel Flight instrument accessory box Flight instrument accessory box or photocell Autopilot control panel or flight instrument accessory box  Replace roll channel. Test lights. (Refer to VOR/LOC mode in Adjustment/Test) If fault is not corrected, flight instrument accessory box is faulty Replace autopilot accessory box. Test lights. (Refer to Test Approach Mode in Adjustment/Test.) If fault is not corrected, the pitch channel is faulty Replace flight instrument accessory box. Test lights by pressing light covers. If lights illuminate, flight instrument accessory box was faulty Replace flight instrument accessory box. Dim cockpit lights (Ref Chapter 33, Control Cabin Lighting). If annunciator lights do not dim automatically, the associated photocell on the captain's or first officer's instrument panel is faulty Test lights by pressing light covers. If lights illuminate, autopilot control panel is faulty. If lights not OK, flight instrument accessory box is faulty  Replace roll channel. Replace flight instrument accessory box Replace autopilot accessory box. Replace pitch channel Replace flight instrument accessory box Replace flight instrument accessory box. Replace photocell Replace autopilot control panel. Replace flight instrument accessory box 

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TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Lights illuminate steady Lights illuminate steady when autopilot is disengaged Lights do not illuminate when autopilot is disengaged  Self-test switch left in a test position Autopilot accessory box Control panel or autopilot accessory box  Check pitch channel, roll channel and yaw damper coupler self-test switches. Ensure all self-test switches are off Press warning light or autopilot disengage switch. If lights do not flash, autopilot accessory box is faulty Press warning light. If lights flash, control panel is faulty. If lights do not flash, autopilot accessory box is faulty  Return self-test switch to OFF Replace autopilot accessory box Replace autopilot control panel. Replace autopilot accessory box 

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4.  Yaw Damper Coupler Part No. 4030952-906 BITE Test Trouble Shooting Charts
A.  The BITE tests have been designed primarily for yaw damper system verification. The tests are not intended for isolating failures to the line replaceable unit (LRU); however, failed BITE tests or combination of tests provide some clues useful for trouble shooting to the most likely faulty LRU.
B.  All BITE tests should be run first and failed tests noted (Refer to Autopilot and Yaw Damper System - Adjustment/Test). Components involved in each test have an X listed under the appropriate test. In most cases, failure of any of the BITE tests requires replacement of the unit being tested. If additional tests are failed after replacement of the unit, or if all tests fail involving the engage interlock circuits, the interlock circuits should be checked and verified before replacing additional LRUs. Hydraulic power control unit components are assumed to be part of the engage interlocks. The following charts assume only single failures with the most likely failures listed from the top down for each test.
C.  Yaw Damper Coupler BITE Test Chart
YAW DAMPER 
COUPLER BITE 
TEST FAILED  PROBABLE CAUSE  REMEDY 
1  2  3  4  5 1  5 2  6  7  8 2 
X  X  X  X  X  X  X  X  X  Yaw Damper Coupler  Replace yaw damper coupler 
X  X  X  X  Engage Interlocks  Check interlock 
continuity and 
correct fault 
　
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