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 | N1 eng 2  | msg. no.  | Possible Causes:  |
 | fault  | 22-21039  | 1. EIS Primary Display or N1 Tach Indicator for  |
 |  |  | Engine 2  |
 |  |  | 2. Yaw Damper Coupler  |
 |  |  |  |
 |  |  | Corrective Action:  |
 |  |  | 1. This is a normal condition if EIS Primary display  |
 |  |  | (airplanes with EIS), or N1 Tach Indicator for  |
 |  |  | Engine 2 (airplanes 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 problems are not corrected, do a wiring  |
 |  |  | check between D295 pin 36 and D10094 pin 19 from  |
 |  |  | EIS Primary display.  |
 |  |  | AIRPLANES WITHOUT EIS;  |
 |  |  | If the problems are not corrected, do a wiring  |
 |  |  | check between D295 pin 36 and D544 pin 25 from N1  |
 |  |  | Tach Indicator Engine 1.  |
 |  |  | 5. Inspect electrical connectors for bent or broken  |
 |  |  | pins, contamination, or damage.  |
 |  |  | 6. If the problem is not corrected, troubleshoot EIS  |
 |  |  | or N1 Tachometer indicating system.  |
 |  |  | 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 01 Page 129 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 | | .................................................................................
 | LRRA  | msg. no.  | Possible Causes:  |
 | miscompr  | 22-21041  | Radio Altimeter 1 and Radio Altimeter 2 radio height  |
 |  |  | disagree  |
 |  |  | Yaw Damper Coupler  |
 |  |  |  |
 |  |  | Corrective Action:  |
 |  |  | 1. Troubleshoot Radio Altimeter 1 and Radio  |
 |  |  |  Altimeter 2.  |
 |  |  | 2. Do a wiring check between D295 and Radio  |
 |  |  |  Altimeter 1  |
 |  |  |  D295 pin 13 and D101B pin 12  |
 |  |  |  D295 pin 21 and D101B pin 46  |
 |  |  |  D295 pin 24 and D101B pin 47  |
 |  |  | 3. Do a wiring check between D295 and Radio  |
 |  |  |  Altimeter 2  |
 |  |  |  D295 pin 39 and D103B pin 12  |
 |  |  |  D295 pin 22 and D103B pin 23  |
 |  |  |  D295 pin 54 and D103B pin 22  |
 |  |  | 4. 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 01 Page 130 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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