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A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
System operates  AFC accessory  Replace the AFC 
intermittently.  unit (or Integ Flt System acces-sory unit)  (or Integ Flt unit). accessory unit System accessory 
High rudder  Possible binding  Remove all hydraulic power.  Replace the 
pedal forces  in the control linkage to the  Disconnect the input con-trol rod from the standby  standby actuator.
or  standby actuator.  input lever. Measure the 
Rudder pedals  force required to move the 
kick back during  lever throughout its range 
flight  of motion. This force, 
or  when applied tangentially 
rudder pedals drives the Yaw damper back- not be more than one pound. bolt/clevis centerline, must arm and at approximately the (90`) to the input crank 
or 
Rudder moves or 
airplane dutch 
rolls with yaw 
damper engaged 
or 
Irregular rudder 
pedal steering 
on ground. 

Yaw Damper System Operation Troubleshooting Chart
Figure 102 (Sheet 2)

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A 737-300/400/500MAINTENANCE MANUAL
 3.  Yaw Damper System BITE Test Trouble Shooting Charts (Fig. 103)
___________________________________________________
 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 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 LRU's. 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.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Yaw Damper Coupler BITE Test Chart
Figure 103

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E63303
A
737-300/400/500MAINTENANCE MANUAL
 YAW DAMPER SYSTEM - ADJUSTMENT/TEST
___________________________________
 1.  General_______
 A.  This procedure contains one task. This task is the yaw damper
 operational test.

 B.  Make sure that you adjust the rudder control system correctly before you do the Yaw Damper system test.
 TASK 22-12-00-735-015
 2.  Yaw Damper System Test______________________
 A.  General
 (1)  
This test makes sure the yaw damper coupler operates correctly. The test uses no external equipment.

 (2)  
The Yaw Damper System Test includes:

 (a)  
Yaw Damper Indicator Lights

 (b)  
Yaw Damper Interlock

 (c)  
Flight Control Switches Interlock

 (d)  
Yaw Damper Continuity

 (e)  
Self-Test Switches and Warning Lights
　
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