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ATC intervened to advise flight crew of an light transport turboprop that their heading was 40 degrees off what it should have been. ATC provided vectors to on course. Flight crew could not observe anything wrong with their heading which was being directed by the autoplt flight director.
| Attributes | |
| ACN | 379580 |
| Time | |
| Date | 199709 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : mad |
| State Reference | CT |
| Altitude | msl bound lower : 12000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : prc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 135 |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | enroute airway : zbw |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 4600 flight time type : 1500 |
| ASRS Report | 379580 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were en route from iad-bdl. We were cleared by ZBW to go to calverton VOR, then on to madison VOR. ATC then said cross 10 mi south of madison VOR at 12000 ft. The calverton- madison route was set in the GPS and the aircraft was on autoplt. The GPS seemed to be working correctly when ATC called and asked us our current heading. It was 360 degrees. According to ATC this was approximately 40 degrees off. According to our equipment we were going direct to madison VOR. ATC gave us a new heading to madison VOR and we informed them our route looked correct. The GPS seemed to be working correctly and I could not find any problems with our equipment.
Original NASA ASRS Text
Title: ATC INTERVENED TO ADVISE FLC OF AN LTT TURBOPROP THAT THEIR HDG WAS 40 DEGS OFF WHAT IT SHOULD HAVE BEEN. ATC PROVIDED VECTORS TO ON COURSE. FLC COULD NOT OBSERVE ANYTHING WRONG WITH THEIR HDG WHICH WAS BEING DIRECTED BY THE AUTOPLT FLT DIRECTOR.
Narrative: WE WERE ENRTE FROM IAD-BDL. WE WERE CLRED BY ZBW TO GO TO CALVERTON VOR, THEN ON TO MADISON VOR. ATC THEN SAID CROSS 10 MI S OF MADISON VOR AT 12000 FT. THE CALVERTON- MADISON RTE WAS SET IN THE GPS AND THE ACFT WAS ON AUTOPLT. THE GPS SEEMED TO BE WORKING CORRECTLY WHEN ATC CALLED AND ASKED US OUR CURRENT HDG. IT WAS 360 DEGS. ACCORDING TO ATC THIS WAS APPROX 40 DEGS OFF. ACCORDING TO OUR EQUIP WE WERE GOING DIRECT TO MADISON VOR. ATC GAVE US A NEW HDG TO MADISON VOR AND WE INFORMED THEM OUR RTE LOOKED CORRECT. THE GPS SEEMED TO BE WORKING CORRECTLY AND I COULD NOT FIND ANY PROBS WITH OUR EQUIP.
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.