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An airbus 320 in cruise at FL270 using flight management guidance control was advised by ATC that aircraft was deviating from cleared track.
| Attributes | |
| ACN | 463270 |
| Time | |
| Date | 200002 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : dia.airport |
| State Reference | CO |
| Altitude | msl single value : 27000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 15000 flight time type : 4500 |
| ASRS Report | 463270 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical other spatial deviation |
| Independent Detector | other other : person 3 |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
FMGC did not sequence SID fix on fly over. Although the aircraft remained in managed navigation with course centerline tracking displayed, the computed track was incorrect and did not correspond to displayed flight plan. The aircraft track was close enough to flight plan that we did not detect the deviation at larger map scale display until center let us know our track was deviating. This unknown failure mode of the FGC was written up in the ship's logbook and reported to maintenance.
Original NASA ASRS Text
Title: AN AIRBUS 320 IN CRUISE AT FL270 USING FLT MGMNT GUIDANCE CTL WAS ADVISED BY ATC THAT ACFT WAS DEVIATING FROM CLRED TRACK.
Narrative: FMGC DID NOT SEQUENCE SID FIX ON FLY OVER. ALTHOUGH THE ACFT REMAINED IN MANAGED NAV WITH COURSE CTRLINE TRACKING DISPLAYED, THE COMPUTED TRACK WAS INCORRECT AND DID NOT CORRESPOND TO DISPLAYED FLT PLAN. THE ACFT TRACK WAS CLOSE ENOUGH TO FLT PLAN THAT WE DID NOT DETECT THE DEV AT LARGER MAP SCALE DISPLAY UNTIL CTR LET US KNOW OUR TRACK WAS DEVIATING. THIS UNKNOWN FAILURE MODE OF THE FGC WAS WRITTEN UP IN THE SHIP'S LOGBOOK AND RPTED TO MAINT.
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.