................................................................................. | PR snsr | msg. no. | Possible Causes: | | in fault | 22-21034 | 1. Pressure Reducer Bypass Valve | | | | 2. Yaw Damper Coupler | | | | | | | | Corrective Action: | | | | 1. Make sure that the resistance from 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 | | | | solenoid. | | | | 3. Do a wiring check to ground from D7377 pin 2 at | | | | the Pressure Reducer Bypass Valve solenoid. | | | | 4. Do a wiring check between D295 pin 51 and D737 | | | | pin 3 at the Pressure Reducer Bypass Valve. | | | | 5. Do a wiring check between D295 pin 52 and D737 | | | | pin 2 at the Pressure Reducer Bypass Valve. | | | | 6. Do a wiring check to ground from D737 pin 1 at the | | | | Pressure Reducer Bypass Valve. | | | | 7. Inspect electrical connectors for bent or broken | | | | pins, contamination, or damage. | | | | 8. If the problem is not corrected, replace the | | | | Pressure Reducer Bypass Valve (AMM 27-21-96/401). | | | | 9. 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 125 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 sw  | msg. no.  | Possible Causes:  |
 | in fault  | 22-21035  | 1. Open circuit between D295 pin 14 and Yaw Damper  |
 |  |  |  Engage switch contacts  |
 |  |  | 2. Yaw Damper Engage switch  |
 |  |  | 3. Yaw Damper Coupler  |
 |  |  |  |
 |  |  | Corrective Action:  |
 |  |  | 1. 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.  |
 |  |  | 2. Do a wiring check between D295 pin 14 and the Yaw  |
 |  |  |  Damper Engage Switch.  |
 |  |  | 3. Inspect electrical connectors for bent or broken  |
 |  |  |  pins, contamination, or damage.  |
 |  |  | 4. If the problem is not corrected, replace the  |
 |  |  |  Yaw Damper Engage Switch.  |
 |  |  | 5. If the problem is not corrected, replace the  |
 |  |  |  Yaw Damper Coupler (AMM 22-12-31/401).  |

 ................................................................................. | LRRA 1 | msg. no. | Possible Causes: | | fault | 22-21036 | 1. Radio Altimeter 1 | | | | 2. Yaw Damper Coupler | | | | | | | | Corrective Action: | | | | 1. This is a normal condition if Radio Altimeter 1 is | | | | not powered or not installed. | | | | 2. If Radio Altimeter 1 is installed, close Radio | | | | Altm-1 circuit breaker. | | | | 3. Do a wiring check between D295 pin 13 and D101B | | | | pin 12, Flag Alarm from Radio Altimeter 1. | | | | 4. Inspect electrical connectors for bent or broken | | | | pins, contamination, or damage. | | | | 5. If the problem is not corrected, replace | | | | Radio Altimeter 1 (AMM 34-48-21/401). | | | | 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 126 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 | | .................................................................................
　
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