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Loss of aircraft control results in an air carrier widebody transport altitude deviation altitude excursion.
| Attributes | |
| ACN | 232645 |
| Time | |
| Date | 199301 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : gtk |
| State Reference | FO |
| Altitude | msl bound lower : 36400 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zma artcc : zma |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : other oceanic enroute : atlantic |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 175 flight time total : 5000 flight time type : 175 |
| ASRS Report | 232645 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 23000 flight time type : 3000 |
| ASRS Report | 232644 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter other non adherence : clearance other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : regained aircraft control flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Aircraft level at FL370 on autoplt several thousand ft above the clouds. We started to experience turbulence and the autoplt limit light illuminated as the aircraft started to descend. Turbulence became severe and the autoplt was disconnected. Despite substantial back pressure the aircraft continued to descend to approximately FL363 where we finally were able to start a climb back to FL370. Severe turbulence. PIREP reported to ZMA.
Original NASA ASRS Text
Title: LOSS OF ACFT CTL RESULTS IN AN ACR WDB ALTDEV ALT EXCURSION.
Narrative: ACFT LEVEL AT FL370 ON AUTOPLT SEVERAL THOUSAND FT ABOVE THE CLOUDS. WE STARTED TO EXPERIENCE TURB AND THE AUTOPLT LIMIT LIGHT ILLUMINATED AS THE ACFT STARTED TO DSND. TURB BECAME SEVERE AND THE AUTOPLT WAS DISCONNECTED. DESPITE SUBSTANTIAL BACK PRESSURE THE ACFT CONTINUED TO DSND TO APPROX FL363 WHERE WE FINALLY WERE ABLE TO START A CLB BACK TO FL370. SEVERE TURB. PIREP RPTED TO ZMA.
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.