22-12-01
 YAW DAMPER COUPLER  ú ú 02 Page 108 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 sw  | msg. no.  | Possible Causes:  |
 | fault  | 22-21005  | 1. Yaw Damper Engage Switch  |
 |  |  | 2. Yaw Damper Coupler  |
 |  |  | 3. Autopilot Accessory Unit  |
 |  |  | 4. Integrated Flight System Accessory Unit  |
 |  |  |  |
 |  |  | Corrective Action:  |
 |  |  | 1. 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.  |
 |  |  | 2. Do a wiring check between D295 pin 14 and the Yaw  |
 |  |  | Damper Engage Switch, and autopilot accessory  |
 |  |  | unit, or integrated flight system accessory unit.  |
 |  |  | 3. Inspect electrical connectors for bent or broken  |
 |  |  | pins, contamination, or damage.  |
 |  |  | 4. If the problem is not corrected, replace the Yaw  |
 |  |  | Damper Engage Switch.  |
 |  |  | 5. If the problem is not corrected, replace the Yaw  |
 |  |  | Damper Coupler (AMM 22-12-31/401).  |
 |  |  | 6. 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).  |

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH 10-62253 ú

 22-12-01
 YAW DAMPER COUPLER  ú ú 02 Page 109 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 | | .................................................................................
 | APL type | msg. no.  | Possible Causes:  |
 | error  | 22-21006  | 1. Yaw Damper Coupler Replacement  |
 |  |  | 2. Airplane wiring  |
 |  |  | 3. Yaw Damper Coupler  |
 |  |  |  |
 |  |  | Corrective Action:  |
 |  |  | 1. This fault may be present when a Yaw Damper  |
 |  |  | Coupler is first installed in an airplane. To  |
 |  |  | clear this fault, do the Yaw Damper Coupler- |
 |  |  | Adjustment/Test (AMM 22-12-32/501).  |
 |  |  | 2. If the problem is not corrected, inspect D295 pin  |
 |  |  | 17 and D295 pin 53 and YDC electrical connector  |
 |  |  | for bent or broken pins, contamination, or damage. |
 |  |  | 3. 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  |
 |  |  |  |
 |  |  | 4. Do the Yaw Damper Coupler-Adjustment/Test  |
 |  |  | (AMM 22-12-32/501).  |
 |  |  | 5. If the problem is not corrected, replace the Yaw  |
 |  |  | Damper Coupler (AMM 22-12-31/401).  |
　
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