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MD83 captain experiences localizer oscillations during an ILS approach to runway 10 at msy; resulting in as go-around. An RNAV approach is then accomplished successfully.
| Attributes | |
| ACN | 1226882 |
| Time | |
| Date | 201412 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | MSY.Airport |
| State Reference | LA |
| Aircraft 1 | |
| Make Model Name | MD-83 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | ILS/VOR |
| Person 1 | |
| Function | Captain |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
During localizer capture and tracking the captain and first officer CDI needles fluctuated from 1/3 to one full dot on the CDI. Aircraft heading shifts went up to 20 degrees left and right of the inbound course. This was all done while the FMA showed trk; trk. Both localizer identification had been verified. A go-around was done due to the instability of the localizer indication resulting in large aircraft heading changes on the final approach course. An RNAV GPS to runway 10 was accomplished and a logbook entry made at the gate.
Original NASA ASRS Text
Title: MD83 Captain experiences localizer oscillations during an ILS approach to Runway 10 at MSY; resulting in as go-around. An RNAV approach is then accomplished successfully.
Narrative: During localizer capture and tracking the Captain and First Officer CDI needles fluctuated from 1/3 to one full dot on the CDI. Aircraft heading shifts went up to 20 degrees left and right of the inbound course. This was all done while the FMA showed TRK; TRK. Both localizer ID had been verified. A go-around was done due to the instability of the localizer indication resulting in large aircraft heading changes on the final approach course. An RNAV GPS to Runway 10 was accomplished and a logbook entry made at the gate.
Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.