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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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