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Inadvertent disconnect of the autoplt from the navigation mode results in a very slow turn that is not noted by the crew until ARTCC questions where they are going.
| Attributes | |
| ACN | 510980 |
| Time | |
| Date | 200105 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : diw.ndb |
| State Reference | NC |
| Altitude | msl single value : 39000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : personal |
| Make Model Name | Learjet 35 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | other |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial |
| Experience | flight time last 90 days : 150 flight time total : 1700 flight time type : 1050 |
| ASRS Report | 510980 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : clearance other spatial deviation |
| Resolutory Action | controller : issued advisory controller : issued new clearance flight crew : returned to intended or assigned course |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Unknown to us, the autoplt descended from the navigation mode and turned the aircraft left of course. It was in about a 3 degree left bank, so it wasn't apparent to us until the controller asked us where we were going. We explained what had happened, and he reclred us on course.
Original NASA ASRS Text
Title: INADVERTENT DISCONNECT OF THE AUTOPLT FROM THE NAV MODE RESULTS IN A VERY SLOW TURN THAT IS NOT NOTED BY THE CREW UNTIL ARTCC QUESTIONS WHERE THEY ARE GOING.
Narrative: UNKNOWN TO US, THE AUTOPLT DSNDED FROM THE NAV MODE AND TURNED THE ACFT L OF COURSE. IT WAS IN ABOUT A 3 DEG L BANK, SO IT WASN'T APPARENT TO US UNTIL THE CTLR ASKED US WHERE WE WERE GOING. WE EXPLAINED WHAT HAD HAPPENED, AND HE RECLRED US ON COURSE.
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.