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A
737-300/400/500MAINTENANCE MANUAL
 ~............................................................................... | FAULT MESSAGE/CORRECTIVE ACTION (TABLE 101) | ................................................................................. | YDC Fault | YDC Fault | Corrective Action | | Message | Detail 1 | | .................................................................................
 | YDC, PCU  | msg. no.  | Possible Causes:  |
 | incompat  | 22-21019  | 1. Program Pins  |
 |  |  | 2. Restricted Yaw Damper Actuator travel  |
 |  |  | 3. Rudder Power Control Unit  |
 |  |  | 4. Yaw Damper Coupler  |
 |  |  |  |
 |  |  | Corrective Action:  |
 |  |  | 1. Inspect D295 pin 17 and D295 pin 53 and YDC  |
 |  |  | electrical connector for bent or broken pins,  |
 |  |  | contamination, or damage.  |
 |  |  | 2. Make sure that D295 pin 17 and D295 pin 53  |
 |  |  | resistance ground is consistent with airplane  |
 |  |  | wiring diagrams:  |
 |  |  |  |
 |  |  | 737 Model D295 Pin 53 D295 Pin 17  |
 |  |  | -500 GROUND GROUND  |
 |  |  | -400 OPEN GROUND  |
 |  |  | -300 OPEN GROUND  |
 |  |  |  |
 |  |  | 3. Make sure that the resistance between D295 pin 46  |
 |  |  | and D295 pin 47 is 80 ohms.  |
 |  |  | 4. Make sure that the resistance between D295 pin 9  |
 |  |  | and D295 pin 1 is 100 ohms.  |
 |  |  | 5. Do a wiring check between D295 pin 46 and D291  |
 |  |  | pin 11 at the Rudder Position Transducer.  |
 |  |  | 6. Do a wiring check between D295 pin 47 and D291 pin |
 |  |  | 12 Rudder Position Transducer.  |
 |  |  | 7. Do a wiring check between D295 pin 9 and D291  |
 |  |  | pin 10 at the Rudder Position Transducer.  |
 |  |  | 8. Do a wiring check to ground at D295 pin 1.  |
 |  |  | 9. Do a wiring check to ground at D291 pin 9 at the  |
 |  |  | Rudder Position Transducer.  |
 |  |  |10. Do a wiring check between D295 pin 9 and D2165B  |
 |  |  | pin C14 at the DAA.  |
 |  |  |11. Inspect electrical connectors for bent or broken  |
 |  |  | pins, contamination, or damage.  |
 |  |  |12. If the problem is not corrected, replace the  |
 |  |  | Rudder Power Control Unit (AMM 27-21-91/401).  |
 |  |  |13. If the problem is not corrected, replace the  |
 |  |  | Yaw Damper Coupler (AMM 22-12-31/401).  |

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 22-12-01
 YAW DAMPER COUPLER  ú ú 02 Page 119 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ~............................................................................... | FAULT MESSAGE/CORRECTIVE ACTION (TABLE 101) | ................................................................................. | YDC Fault | YDC Fault | Corrective Action | | Message | Detail 1 | | .................................................................................
 | A hyd  | msg. no.  | Possible Causes:  |
 | not on  | 22-21020  | 1. Low pressure in A System Hydraulics during YDC  |
 |  |  | Bite Pressure Reducer Test  |
 |  |  | 2. Pressure Reducer Bypass Valve  |
 |  |  | 3. Yaw Damper Coupler  |
 |  |  |  |
 |  |  | Corrective Action:  |
 |  |  | 1. Make sure that the resistance between D295 pin 31  |
 |  |  | to ground is between 50 to 80 ohms.  |
 |  |  | 2. Do a wiring check between D295 pin 31 and D7377  |
 |  |  | pin 1 at the Pressure Reducer Bypass Valve  |
　
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