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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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