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 |  |  |  the Pressure Reducer Bypass Valve solenoid.  |
 |  |  | 4. Inspect electrical connectors for bent or broken  |
 |  |  |  pins, contamination, or damage.  |
 |  |  | 5. If the problem is not corrected, replace the  |
 |  |  |  Pressure Reducer Bypass Valve (AMM 27-21-96/401).  |
 |  |  | 6. 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 112 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 sol | msg. no. | Possible Causes:  |
 | low volt | 22-21011 | 1. Low 28 VDC voltage applied to the Yaw Damper  |
 |  |  | Coupler  |
 |  |  | 2. Yaw Damper Engage Switch  |
 |  |  | 3. Yaw Damper Coupler  |
 |  |  | 4. Yaw Damper Engage Solenoid  |
 |  |  |  |
 |  |  | Corrective Action:  |
 |  |  | 1. Make sure that the voltage to D295 pin 4 is  |
 |  |  | between 22.0 and 29.5 volts DC with the Yaw Damper |
 |  |  | DC circuit breaker closed.  |
 |  |  | 2. Make sure that the resistance from D295 pin 14 to  |
 |  |  | ground is less than 2.0 ohms with Yaw Damper  |
 |  |  | Engage Switch in the OFF position.  |
 |  |  | 3. Make sure that the resistance from D295 pin 20  |
 |  |  | to ground is between 50 to 80 ohms.  |
 |  |  | 4. Do a wiring check between D295 pin 20 and D291  |
 |  |  | pin 1 at the Yaw Damper Engage Solenoid  |
 |  |  | (AMM 22-12-21/401).  |
 |  |  | 5. Do a wiring check to ground from D291 pin 2 at the |
 |  |  | Yaw Damper Engage Solenoid.  |
 |  |  | 6. Inspect electrical connectors for bent or broken  |
 |  |  | pins, contamination, or damage.  |
 |  |  | 7. If the problem is not corrected, replace the  |
 |  |  | Yaw Damper Coupler (AMM 22-12-31/401).  |
 |  |  | 8. If the problem is not corrected, replace the Yaw  |
 |  |  | Damper Engage Solenoid (AMM 22-12-21/401).  |

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH 10-62253 ú

 22-12-01
 YAW DAMPER COUPLER  ú ú 02 Page 113 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 sol  | msg. no.  | Possible Causes:  |
 | low volt  | 22-21012  | 1. Low 28 VDC voltage applied to the Yaw Damper  |
 |  |  | Coupler  |
 |  |  | 2. Pressure Reducer Bypass Valve  |
 |  |  | 3. Yaw Damper Coupler  |
 |  |  |  |
 |  |  | Corrective Action:  |
 |  |  | 1. Make sure that the voltage to D295 pin 4 is  |
 |  |  | between 22.0 and 29.5 volts DC with the Yaw Damper |
　
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