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 | PR on  | msg. no.  | Possible Causes:  |
 | fault  | 22-21022  | 1. Hydraulic Pressure not reduced 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 Pressure Reducer Bypass Valve  |
 |  |  | manual level is set to NORMAL.  |
 |  |  | 2. Make sure that the Yaw Damper DC circuit breaker  |
 |  |  | is closed.  |
 |  |  | 3. Make sure that the resistance from D295 pin 31  |
 |  |  | to ground is between 50 to 80 ohms.  |
 |  |  | 4. Do a wiring check between D295 pin 31 and D7377  |
 |  |  | pin 1 at the Pressure Reducer Bypass Valve  |
 |  |  | solenoid.  |
 |  |  | 5. Do a wiring check to ground from D7377 pin 2 at  |
 |  |  | the Pressure Reducer Bypass Valve solenoid.  |
 |  |  | 6. Do a wiring check between D295 pin 51 and D737  |
 |  |  | pin 3 at the Pressure Reducer Bypass Valve.  |
 |  |  | 7. Do a wiring check between D295 pin 52 and D737  |
 |  |  | pin 2 at the Pressure Reducer Bypass Valve.  |
 |  |  | 8. Do a wiring check to ground from D737 pin 1 at the |
 |  |  | Pressure Reducer Bypass Valve.  |
 |  |  | 9. Inspect electrical connectors for bent or broken  |
 |  |  | pins, contamination, or damage.  |
 |  |  |10. If the problem is not corrected, replace the  |
 |  |  | Pressure Reducer Bypass Valve (AMM 27-21-96/401).  |
 |  |  |11. If the problem is not corrected, replace the  |
 |  |  | Yaw Damper Coupler (AMM 22-12-31/401).  |

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 22-12-01
 YAW DAMPER COUPLER  ú ú 02 Page 122 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 | | .................................................................................
 | prgm  | msg. no.  | Possible Causes:  |
 | pin  | 22-21023  | 1. Program pins do not match airplane type  |
 | fault  |  | selected during YDC BITE Program Pin Test  |
 |  |  | 2. Operator error  |
 |  |  | 3. Airplane wiring  |
 |  |  | 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 to 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. Perform Yaw Damper Coupler - Adjustment/Test  |
 |  |  | (AMM 22-12-01/501).  |
 |  |  | 4. If the problem is not corrected, replace the  |
 |  |  | Yaw Damper Coupler (AMM 22-12-31/401).  |

 ................................................................................. | A hyd lo | msg. no. | Possible Causes: | | on fault | 22-21025 | 1. Flt Control A Low Pressure light did not | | | | illuminate during YDC BITE Pressure Reducer Test | | | | 2. Operator error | | | | 3. Flt Control A Low Pressure light inoperative | | | | 4. Yaw Damper Coupler | | | | | | | | Corrective Action: | | | | 1. Make sure that Flt Control A switch is in the ON | | | | position. | | | | 2. Make sure that Flt Control A light illuminates, | | | | press to test. | | | | 3. Do a wiring check between D295 pin 57 and Flt | | | | Control A Low Pressure light. | | | | 4. Inspect D295 pin 57 and YDC electrical connector | | | | for bent or broken pins, contamination, or damage. | | | | 5. Perform Yaw Damper Coupler - Adjustment/Test | | | | (AMM 22-12-32/501). | | | | 6. If the problem is not corrected, replace the | | | | Yaw Damper Coupler (AMM 22-12-31/401). |
　
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