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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). |
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH 10-62253 ú
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.
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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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本文链接地址：737-300 400 500 AMM 飞机维护手册 自动飞行 AUTOFLIGHT 2(99)
