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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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