EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH 10-62253 ú
 22-12-01
 YAW DAMPER COUPLER  ú ú 02 Page 127 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 | | .................................................................................
 | N1 eng 1 | msg. no. | Possible Causes:  | 
 | fault | 22-21038 | 1. EIS Primary Display or N1 Tach Indicator for  | 
 |  |  | Engine 1  | 
 |  |  | 2. Yaw Damper Coupler  | 
 |  |  |  | 
 |  |  | Corrective Action:  | 
 |  |  | 1. This is a normal condition if EIS Primary display  | 
 |  |  | (for airplanes with EIS), or N1 Tach Indicator for | 
 |  |  | Engine 1 (for aiplanes without EIS), is not  | 
 |  |  | powered or not installed.  | 
 |  |  | 2. AIRPLANES WITH EIS;  | 
 |  |  | Make sure that EIS PRIM 1 and EIS PRIM 3 circuit  | 
 |  |  | breakers are closed.  | 
 |  |  | AIRPLANES WITHOUT EIS;  | 
 |  |  | Make sure that N1 TACH ENG1 and N1 TACH ENG2  | 
 |  |  | circuit breakers are closed.  | 
 |  |  | 3. AIRPLANES WITH EIS;  | 
 |  |  | If the problem is not corrected, do a wiring check | 
 |  |  | between D295 pin 35 and D10092 pin 19 from EIS  | 
 |  |  | Primary display.  | 
 |  |  | AIRPLANES WITHOUT EIS;  | 
 |  |  | If the problem is not corrected, do a wiring check | 
 |  |  | between; D295 pin 35 and D542 pin 25 from N1 Tach  | 
 |  |  | Indicator Engine 1.  | 
 |  |  | 4. Inspect electrical connectors for bent or broken  | 
 |  |  | pins, contamination, or damage.  | 
 |  |  | 5. If the problem is not corrected, troubleshoot EIS  | 
 |  |  | or N1 Tachometer indicating system.  | 
 |  |  | 6. 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 128 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 | | .................................................................................
 
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