................................................................................. | YD EHSV | msg. no. | Possible Causes: | | fault | 22-21013 | 1. Yaw Damper Transfer Valve | | | | 2. Yaw Damper Coupler | | | | | | | | Corrective Action: | | | | 1. Make sure that the resistance between D295 pin 30 | | | | and D295 pin 32 is 2000 ohms. | | | | 2. Do a wiring check between D295 pin 30 and D291 | | | | pin 8 at the Yaw Damper Transfer Valve. | | | | 3. Do a wiring check between D295 pin 32 and D291 | | | | pin 5 at the Yaw Damper Transfer Valve. | | | | 4. Do a wiring check between D291 pin 7 and D291 | | | | pin 6 at the Yaw Damper Transfer Valve. | | | | 5. Inspect electrical connectors for bent or broken | | | | pins, contamination, or damage. | | | | 6. If the problem is not corrected, replace the Yaw | | | | Damper Transfer Valve (AMM 22-12-21/401). | | | | 7. 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 114 ú Jul 12/01
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737-300/400/500MAINTENANCE MANUAL
~............................................................................... | FAULT MESSAGE/CORRECTIVE ACTION (TABLE 101) | ................................................................................. | YDC Fault | YDC Fault | Corrective Action | | Message | Detail 1 | | .................................................................................
| YDC 26V | msg. no. | Possible Causes: |
| AC fault | 22-21014 | 1. Rudder Power Control Unit |
| | | 2. Yaw Damper Coupler |
| | | 3. DAA |
| | | |
| | | Corrective Action: |
| | | 1. Make sure that the resistance between D295 pin 9 |
| | | and D295 pin 1 is 100 ohms. |
| | | 2. Do a wiring check between D295 pin 9 and D291 |
| | | pin 10 at the Rudder Power Control Unit position |
| | | transducer. |
| | | 3. Do a wiring check to ground at D295 pin 1. |
| | | 4. Do a wiring check to ground at D291 pin 9 at the |
| | | Rudder Power Control Unit position transducer. |
| | | 5. Do a wiring check between D295 pin 9 and D2165B |
| | | pin C14 at the DAA. |
| | | 6. Inspect electrical connectors for bent or broken |
| | | pins, contamination, or damage. |
| | | 7. If the problem is not corrected, replace the |
| | | Rudder Power Control Unit (AMM 27-21-91/401). |
| | | 8. If the problem is not corrected, replace DAA-1 |
| | | (AMM 34-28-41/401). |
| | | 9. If the problem is not corrected, replace the |
| | | Yaw Damper Coupler (AMM 22-12-21/401). |
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH 10-62253 ú 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址:737-300 400 500 AMM 飞机维护手册 自动飞行 AUTOFLIGHT 2(89)