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MD80S aircraft on ILS approach behind an MD11, flight crew suspects localizer fluctuation may have been caused by the preceding aircraft.
| Attributes | |
| ACN | 385230 |
| Time | |
| Date | 199711 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 385230 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Following an MD11 approximately 5 mi ahead on final to runway 9R at ord experienced some localizer deviation. Deviation was within localizer limits as far as being legally established on final, however, with the autoplt engaged the autoplt was chasing the localizer. Suspect occurrence might have a correlation to following widebody transport aircraft on approach.
Original NASA ASRS Text
Title: MD80S ACFT ON ILS APCH BEHIND AN MD11, FLC SUSPECTS LOC FLUCTUATION MAY HAVE BEEN CAUSED BY THE PRECEDING ACFT.
Narrative: FOLLOWING AN MD11 APPROX 5 MI AHEAD ON FINAL TO RWY 9R AT ORD EXPERIENCED SOME LOC DEV. DEV WAS WITHIN LOC LIMITS AS FAR AS BEING LEGALLY ESTABLISHED ON FINAL, HOWEVER, WITH THE AUTOPLT ENGAGED THE AUTOPLT WAS CHASING THE LOC. SUSPECT OCCURRENCE MIGHT HAVE A CORRELATION TO FOLLOWING WDB ACFT ON APCH.
Data retrieved from NASA's ASRS site as of July 2007 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.