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An air carrier large transport overshot its assigned altitude by 300 ft when the altitude capture function of the autoplt malfunctions.
| Attributes | |
| ACN | 426770 |
| Time | |
| Date | 199901 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zny |
| State Reference | NY |
| Altitude | msl bound lower : 14000 msl bound upper : 14300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : clt |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : cfi |
| Experience | flight time last 90 days : 220 flight time total : 19000 flight time type : 400 |
| ASRS Report | 426770 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot other anomaly other |
| Independent Detector | other flight crewa |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Climbing to an assigned altitude of 14000 ft, using LNAV and VNAV modes, the aircraft autoplt flew through the 14000 ft altitude. The autoplt was disconnected, and the climb stopped at 14300 ft, then the aircraft was descended back to 14000 ft and the autoplt was re-engaged. No further problems were encountered.
Original NASA ASRS Text
Title: AN ACR LGT OVERSHOT ITS ASSIGNED ALT BY 300 FT WHEN THE ALT CAPTURE FUNCTION OF THE AUTOPLT MALFUNCTIONS.
Narrative: CLBING TO AN ASSIGNED ALT OF 14000 FT, USING LNAV AND VNAV MODES, THE ACFT AUTOPLT FLEW THROUGH THE 14000 FT ALT. THE AUTOPLT WAS DISCONNECTED, AND THE CLB STOPPED AT 14300 FT, THEN THE ACFT WAS DSNDED BACK TO 14000 FT AND THE AUTOPLT WAS RE-ENGAGED. NO FURTHER PROBS WERE ENCOUNTERED.
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.