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ARTCC controller intervened to inform an air carrier large transport aircraft flight crew that they were 20 mi off course. When the flight crew checked raw data off course was confirmed.
| Attributes | |
| ACN | 236798 |
| Time | |
| Date | 199303 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : hfd |
| State Reference | CT |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 130 flight time total : 10000 flight time type : 2000 |
| ASRS Report | 236798 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
FMS showed on track with no failure or dead reckoning warnings. ATC controller reported 20 NM south of course. A check of raw data showed him to be correct. A new position was entered and no further failure encountered.
Original NASA ASRS Text
Title: ARTCC CTLR INTERVENED TO INFORM AN ACR LGT ACFT FLC THAT THEY WERE 20 MI OFF COURSE. WHEN THE FLC CHKED RAW DATA OFF COURSE WAS CONFIRMED.
Narrative: FMS SHOWED ON TRACK WITH NO FAILURE OR DEAD RECKONING WARNINGS. ATC CTLR RPTED 20 NM S OF COURSE. A CHK OF RAW DATA SHOWED HIM TO BE CORRECT. A NEW POS WAS ENTERED AND NO FURTHER FAILURE ENCOUNTERED.
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.