EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH 10-62253 ú
22-12-01
YAW DAMPER COUPLER ú ú 02 Page 120 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 off | msg. no. | Possible Causes: |
| fault | 22-21021 | 1. Low pressure in A System Hydraulics during YDC |
| | | Bite Pressure Reducer Test |
| | | 2. Pressure Reducer Bypass Valve |
| | | 3. Yaw Damper Coupler |
| | | |
| | | Corrective Action: |
| | | 1. Make sure that the resistance between 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 121 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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