................................................................................. | YDC 28V | msg. no. | Possible Causes: | | DC high | 22-21007 | 1. Excessive 28 VDC voltage applied to Yaw Damper | | | | Coupler | | | | 2. 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 | | | | DC circuit breaker closed. | | | | 2. 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 110 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 28V | msg. no. | Possible Causes: |
| DC low | 22-21008 | 1. Low or No 28 VDC voltage applied to Yaw Damper |
| | | Coupler |
| | | 2. Yaw Damper Coupler |
| | | |
| | | Corrective Action: |
| | | 1. Make sure that the Yaw Damper DC circuit breaker |
| | | is closed. |
| | | 2. Make sure that the voltage to D295 pin 4 is |
| | | between 22.0 and 29.5 volts DC. |
| | | 3. Inspect electrical connectors for bent or broken |
| | | pins, contamination, or damage. |
| | | 4. If the problem is not corrected, replace the |
| | | Yaw Damper Coupler (AMM 22-12-31/401). |
................................................................................. | YD sol | msg. no. | Possible Causes: | | short | 22-21009 | 1. Yaw Damper Engage Solenoid | | | | 2. Yaw Damper Coupler | | | | | | | | Corrective Action: | | | | 1. Make sure that the resistance from D295 pin 20 | | | | to ground is between 50 to 80 ohms. | | | | 2. Do a wiring check between D295 pin 20 and D291 | | | | pin 1 at the Yaw Damper Engage Solenoid. | | | | 3. Do a wiring check to ground from D291 pin 2 at the | | | | Yaw Damper Engage Solenoid. | | | | 4. Inspect electrical connectors for bent or broken | | | | pins, contamination, or damage. | | | | 5. If the problem is not corrected, replace the Yaw | | | | Damper Engage Solenoid (AMM 22-12-21/401). | | | | 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 111 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: |
| short | 22-21010 | 1. Pressure Reducer Bypass Valve |
| | | 2. Yaw Damper Coupler |
| | | |
| | | Corrective Action: |
| | | 1. Make sure that the resistance from D295 pin 31 |
| | | to ground is bewteen 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 |
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