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Flight crew of medium large transport in turn at 11000' MSL on autoplt experienced an unexpected descent to 10650' before flight crew could disengage the autoplt and recover control of aircraft to return to 11000'.
| Attributes | |
| ACN | 162260 |
| Time | |
| Date | 199011 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : atl |
| State Reference | GA |
| Altitude | msl bound lower : 10650 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl tower : tul |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 200 flight time total : 4000 |
| ASRS Report | 162260 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 100 flight time total : 2500 flight time type : 220 |
| ASRS Report | 162661 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem flight crew : regained aircraft control |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While in a turn at 11000' on autoplt aircraft started hard descent lost 350' before recovering altitude. Disengaged autoplt to recover. No other problems. Altitude excursion 350' (11000'-10650') at atlanta, on approach.
Original NASA ASRS Text
Title: FLC OF MLG IN TURN AT 11000' MSL ON AUTOPLT EXPERIENCED AN UNEXPECTED DESCENT TO 10650' BEFORE FLC COULD DISENGAGE THE AUTOPLT AND RECOVER CTL OF ACFT TO RETURN TO 11000'.
Narrative: WHILE IN A TURN AT 11000' ON AUTOPLT ACFT STARTED HARD DSNT LOST 350' BEFORE RECOVERING ALT. DISENGAGED AUTOPLT TO RECOVER. NO OTHER PROBS. ALT EXCURSION 350' (11000'-10650') AT ATLANTA, ON APCH.
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.