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 | LRRA 2  | msg. no.  | Possible Causes:  |
 | fault  | 22-21037  | 1. Radio Altimeter 2  |
 |  |  | 2. Yaw Damper Coupler  |
 |  |  |  |
 |  |  | Corrective Action:  |
 |  |  | 1. This is a normal condition if Radio Altimeter 2 is |
 |  |  |  not powered or not installed.  |
 |  |  | 2. If Radio Altimeter 2 is installed, close Radio  |
 |  |  |  Altm-2 circuit breaker.  |
 |  |  | 3. Do a wiring check between D295 pin 39 and D103B  |
 |  |  |  pin 12, Flag Alarm from Radio Altimeter 2.  |
 |  |  | 4. Inspect electrical connectors for bent or broken  |
 |  |  |  pins, contamination, or damage.  |
 |  |  | 5. If the problem is not corrected, replace  |
 |  |  |  Radio Altimeter 2 (AMM 34-48-21/401).  |
 |  |  | 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 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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