22-12-01
YAW DAMPER COUPLER ú ú 02 Page 115 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 | | .................................................................................
| YD not | msg. no. | Possible Causes: |
| engaged | 22-21015 | 1. Yaw Damper Engage Switch not engaged during YDC |
| | | BITE Self Test |
| | | 2. Yaw Damper Coupler |
| | | 3. Autopilot Accessory Unit |
| | | 4. Integrated Flight System Accessory Unit |
| | | |
| | | Corrective Action: |
| | | 1. Perform Yaw Damper Coupler - Adjustment/Test. |
| | | 2. Make sure that the resistance from D295 pin 14 |
| | | to ground is less than 2.0 ohms with Yaw Damper |
| | | Engage Switch in the OFF position. |
| | | 3. Do a wiring check between D295 pin 14, and the Yaw |
| | | Damper Engage Switch, and autopilot accessory |
| | | unit, or integrated flight system accessory unit. |
| | | 4. Inspect electrical connectors for bent or broken |
| | | pins, contamination, or damage. |
| | | 5. If the problem is not corrected, replace the |
| | | Yaw Damper Engage Switch. |
| | | 6. If the problem is not corrected, replace the |
| | | Yaw Damper Coupler (AMM 22-12-31/401). |
| | | 7. If the problem is not corrected, replace the |
| | | autopilot accessory unit (AMM 22-11-36/401 or |
| | | integrated flight system accessory unit |
| | | (AMM 22-11-37/401). |
................................................................................. | B hyd | msg. no. | Possible Causes: | | not on | 22-21016 | 1. B System Hydraulics not pressurized during YDC | | | | BITE Servo Test | | | | 2. Flight Control System B Pressure Switch | | | | 3. Yaw Damper Coupler | | | | | | | | Corrective Action: | | | | 1. Do a wiring check between D295 pin 7 and D816 | | | | pin 3 at the Flight Control System B Pressure | | | | Switch. | | | | 2. Do a wiring check to ground at D816 pin 2 at the | | | | Flight Control System B Pressure Switch. | | | | 3. Inspect electrical connectors for bent or broken | | | | pins, contamination, or damage. | | | | 4. If the problem is not corrected, replace Flight | | | | Control System B Pressure Switch (AMM 29-34-21/401)| | | | 5. 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 116 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 | | .................................................................................
| YD actr | msg. no. | Possible Causes: |
| limit | 22-21017 | 1. Excessive Yaw Damper Actuator Travel |
| | | 2. Rudder Power Control Unit |
| | | 3. Yaw Damper Coupler |
| | | |
| | | Corrective Action: |
| | | 1. Make sure that the resistance between D295 pin 46 |
| | | and D295 pin 47 is 80 ohms. |
| | | 2. Make sure that the resistance between D295 pin 9 |
| | | and D295 pin 1 is 100 ohms. |
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