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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, PCU | msg. no. | Possible Causes: |
| incompat | 22-21019 | 1. Program Pins |
| | | 2. Restricted Yaw Damper Actuator travel |
| | | 3. Rudder Power Control Unit |
| | | 4. Yaw Damper Coupler |
| | | |
| | | Corrective Action: |
| | | 1. Inspect D295 pin 17 and D295 pin 53 and YDC |
| | | electrical connector for bent or broken pins, |
| | | contamination, or damage. |
| | | 2. Make sure that D295 pin 17 and D295 pin 53 |
| | | resistance ground is consistent with airplane |
| | | wiring diagrams: |
| | | |
| | | 737 Model D295 Pin 53 D295 Pin 17 |
| | | -500 GROUND GROUND |
| | | -400 OPEN GROUND |
| | | -300 OPEN GROUND |
| | | |
| | | 3. Make sure that the resistance between D295 pin 46 |
| | | and D295 pin 47 is 80 ohms. |
| | | 4. Make sure that the resistance between D295 pin 9 |
| | | and D295 pin 1 is 100 ohms. |
| | | 5. Do a wiring check between D295 pin 46 and D291 |
| | | pin 11 at the Rudder Position Transducer. |
| | | 6. Do a wiring check between D295 pin 47 and D291 pin |
| | | 12 Rudder Position Transducer. |
| | | 7. Do a wiring check between D295 pin 9 and D291 |
| | | pin 10 at the Rudder Position Transducer. |
| | | 8. Do a wiring check to ground at D295 pin 1. |
| | | 9. Do a wiring check to ground at D291 pin 9 at the |
| | | Rudder Position Transducer. |
| | |10. Do a wiring check between D295 pin 9 and D2165B |
| | | pin C14 at the DAA. |
| | |11. Inspect electrical connectors for bent or broken |
| | | pins, contamination, or damage. |
| | |12. If the problem is not corrected, replace the |
| | | Rudder Power Control Unit (AMM 27-21-91/401). |
| | |13. 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 119 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 | | .................................................................................
| A hyd | msg. no. | Possible Causes: |
| not on | 22-21020 | 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 |
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