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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:  |
 | fault  | 22-21042  | 1. Yaw Damper Coupler  |
 |  |  | 2. Yaw Damper Engage Solenoid  |
 |  |  | 3. Yaw Damper Transfer Valve  |
 |  |  | 4. Rudder Power Control Unit  |
 |  |  |  |
 |  |  | Corrective Action:  |
 |  |  | 1. Make sure that the resistance from D295 pin 20  |
 |  |  | to ground is between 50 to 80 ohms.  |
 |  |  | 2. Make sure that the resistance between D295 pin 30  |
 |  |  | and D295 pin 32 is 2000 ohms.  |
 |  |  | 3. Make sure that the resistance between D295 pin 9  |
 |  |  | and D295 pin 1 is 100 ohms.  |
 |  |  | 4. Make sure that the resistance between D295 pin 46  |
 |  |  | and D295 pin 47 is 80 ohms.  |
 |  |  | 5. Do a wiring check between D295 pin 20 and D291  |
 |  |  | pin 1 at the Yaw Damper Engage Solenoid.  |
 |  |  | 6. Do a wiring check to ground from D291 pin 2 at  |
 |  |  | the Yaw Damper Engage Solenoid.  |
 |  |  | 7. Do a wiring check between D295 pin 30 and D291  |
 |  |  | pin 8 at the Yaw Damper Transfer Valve.  |
 |  |  | 8. Do a wiring check between D295 pin 32 and D291  |
 |  |  | pin 5 at the Yaw Damper Transfer Valve.  |
 |  |  | 9. Do a wiring check between D291 pin 7 and D291  |
 |  |  | pin 6 at the Yaw Damper Transfer Valve.  |
 |  |  |10. Do a wiring check between D295 pin 46 and D291  |
 |  |  | pin 11 at the Rudder Power Control Unit position  |
 |  |  | transducer.  |
 |  |  |11. Do a wiring check between D295 pin 47 and D291 pin |
 |  |  | 12 Rudder Power Control Unit position transducer.  |
 |  |  |12. Do a wiring check between D295 pin 9 and D291  |
 |  |  | pin 10 at the Rudder Power Control Unit position  |
 |  |  | transducer.  |
 |  |  |13. Do a wiring check to ground from D295 pin 1.  |
 |  |  |14. Do a wiring check to ground at D291 pin 9 at the  |
 |  |  | Rudder Power Control Unit position transducer.  |
 |  |  |15. Do a wiring check between D295 pin 9 and D2165B  |
 |  |  | pin C14 at the DAA.  |
 |  |  |16. Inspect electrical connectors for bent or broken  |
 |  |  | pins, contamination, or damage.  |
 |  |  |17. If the problem is not corrected, replace Rudder  |
 |  |  | Power Control Unit (AMM 27-21-91/401).  |
 |  |  |18. 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 01 Page 131 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 | | ................................................................................. | PR | msg. no. | Possible Causes: | | fault | 22-21043 | 1. Pressure Reducer Bypass Valve | | | | 2. Yaw Damper Coupler | | | | | | | | Corrective Action: | | | | 1. Make sure that the Pressure Reducer Bypass Valve | | | | manual lever is set to NORMAL. | | | | 2. Make sure that the resistance from D295 pin 31 | | | | to ground is between 50 to 80 ohms. | | | | 3. Do a wiring check between D295 pin 31 and D7377 | | | | pin 1 at the Pressure Reducer Bypass Valve | | | | solenoid. | | | | 4. Do a wiring check to ground from D7377 pin 2 at | | | | the Pressure Reducer Bypass Valve solenoid. | | | | 5. Do a wiring check between D295 pin 51 and D737 | | | | pin 3 at the Pressure Reducer Bypass Valve. | | | | 6. Do a wiring check between D295 pin 52 and D737 | | | | pin 2 at the Pressure Reducer Bypass Valve. | | | | 7. Do a wiring check to ground from D737 pin 1 at the | | | | Pressure Reducer Bypass Valve. | | | | 8. Inspect electrical connectors for bent or broken | | | | pins, contamination, or damage. | | | | 9. If the problem is not corrected, replace the | | | | Pressure Reducer Bypass Valve. | | | |10. If the problem is not corrected, replace the | | | | Yaw Damper Coupler (AMM 22-12-31/401). |
　
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