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 |  |  | 3. Do a wiring check between D295 pin 46 and D291  |
 |  |  | pin 11 at the Rudder Power Control Unit position  |
 |  |  | transducer.  |
 |  |  | 4. Do a wiring check between D295 pin 47 and D291  |
 |  |  | pin 12 at the Rudder Power Control Unit position  |
 |  |  | transducer.  |
 |  |  | 5. Do a wiring check between D295 pin 9 and D291  |
 |  |  | pin 10 at the Rudder Power Control Unit position  |
 |  |  | transducer.  |
 |  |  | 6. Do a wiring check to ground at D295 pin 1.  |
 |  |  | 7. Do a wiring check to ground at D291 pin 9 at the  |
 |  |  | Rudder Power Control Unit position transducer.  |
 |  |  | 8. Do a wiring check between D295 pin 9 and D2165B  |
 |  |  | pin C14 at the DAA.  |
 |  |  | 9. Inspect electrical connectors for bent or broken  |
 |  |  | pins, contamination, or damage.  |
 |  |  |10. If the problem is not corrected, replace the  |
 |  |  | Rudder Power Control Unit (AMM 27-21-91/401).  |
 |  |  |11. If the problem is not corrected, replace the  |
 |  |  | Yaw Damper Coupler (AMM 22-12-31/401).  |

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH 10-62253 ú

 22-12-01
 YAW DAMPER COUPLER  ú ú 02 Page 117 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 | | .................................................................................
 | YD actr  | msg. no.  | Possible Causes:  |
 | rigging  | 22-21018  | 1. Asymmetric Yaw Damper Actuator Travel  |
 |  |  | 2. Rudder Power Control Unit  |
 |  |  | 3. Yaw Damper Coupler  |
 |  |  |  |
 |  |  | Corrective Action:  |
 |  |  | 1. Make sure that the resistance between D295 pin 46  |
 |  |  | and D295 pin 47 is 80 ohms.  |
 |  |  | 2. Make sure that the resistance between D295 pin 9  |
 |  |  | and D295 pin 1 is 100 ohms.  |
 |  |  | 3. Do a wiring check between D295 pin 46 and D291  |
 |  |  | pin 11 at the Rudder Position Transducer.  |
 |  |  | 4. Do a wiring check between D295 pin 47 and D291  |
 |  |  | pin 12 at the Rudder Position Transducer.  |
 |  |  | 5. Do a wiring check between D295 pin 9 and D291  |
 |  |  | pin 10 at the Rudder Position Transducer.  |
 |  |  | 6. Do a wiring check to ground at D295 pin 1.  |
 |  |  | 7. Do a wiring check to ground at D291 pin 9 at the  |
 |  |  | Rudder Position Transducer.  |
 |  |  | 8. Do a wiring check between D295 pin 9 and D2165B  |
 |  |  | pin C14 at the DAA.  |
 |  |  | 9. Inspect electrical connectors for bent or broken  |
 |  |  | pins, contamination, or damage.  |
 |  |  |10. If the problem is not corrected, replace the  |
 |  |  | Rudder Power Control Unit (AMM 27-21-91/401).  |
 |  |  |11. If the problem is not corrected, replace the  |
 |  |  | Yaw Damper Coupler (AMM 22-12-31/401).  |

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH 10-62253 ú

 22-12-01
 YAW DAMPER COUPLER  ú ú 02 Page 118 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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