22-12-01
 YAW DAMPER COUPLER  ú ú 02 Page 123 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 lo | msg. no. | Possible Causes:  |
 | off flt | 22-21026 | 1. Flt Control A Low Pressure light did not  |
 |  |  | extinguish during YDC BITE Pressure Reducer Test  |
 |  |  | 2. Operator error  |
 |  |  | 3. Flight Control System A Pressure Switch  |
 |  |  | 4. Yaw Damper Coupler  |
 |  |  |  |
 |  |  | Corrective Action:  |
 |  |  | 1. Pressurize A System Hydraulics  |
 |  |  | 2. Make sure that Flt Control A switch is in the ON  |
 |  |  | position.  |
 |  |  | 3. Make sure that Flt Control A Low Pressure light is |
 |  |  | off.  |
 |  |  | 4. Do a wiring check between D295 pin 57 and Flt  |
 |  |  | Control A Low Pressure light.  |
 |  |  | 5. Inspect D295 pin 57 and YDC electrical connector  |
 |  |  | for bent or broken pins, contamination, or damage. |
 |  |  | 6. Perform Yaw Damper Coupler - Adjustment/Test  |
 |  |  | (AMM 22-12-32/501).  |
 |  |  | 7. If the problem is not corrected, replace the  |
 |  |  | Yaw Damper Coupler (AMM 22-12-31/401).  |

 ................................................................................. | B hyd | msg. no. | Possible Causes: | | off | 22-21027 | Low pressure in B system hydraulics | | | | Yaw Damper Coupler | | | | | | | | Corrective Action: | | | | 1. Pressurize B System Hydraulics | | | | 2. Make sure that Flt Control B switch is in the ON | | | | position. | | | | 3. Make sure that Flt Control B Low Pressure light is | | | | off. | | | | 4. Perform Yaw Damper Coupler - Adjustment/Test | | | | (AMM 22-12-01/501). | | | | 5. Do a wiring check between D295 pin 7 and D816 | | | | pin 3 at the Flight Control System B Pressure | | | | Switch. | | | | 6. Do a wiring check to ground at D816 pin 2 at the | | | | Flight Control System B Switch. | | | | 7. 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 124 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 | | .................................................................................
 | AS  | msg. no.  | Possible Causes:  |
 | in fault  | 22-21031  | 1. Air Data Computer 1  |
 |  |  | 2. Yaw Damper Coupler  |
 |  |  |  |
 |  |  | Corrective Action:  |
 |  |  | 1. Make sure that Air Data Computer 1 is installed.  |
 |  |  | 2. Do a wiring check between D295 pin 40, and D295  |
 |  |  |  pin 41, and D295 pin 42, and D295 pin 43, and Air  |
 |  |  |  Data Computer 1.  |
 |  |  | 3. If the problem is not corrected, replace  |
 |  |  |  Air Data Computer 1 (AMM 34-12-11/401).  |
 |  |  | 4. If the problem is not corrected, replace the  |
　
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