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Flight crew overshot altitude when the FMS programming failed to capture at the assigned altitude. The flight crew reported that the arming mechanism for the altitude alerter apparently malfunctioned.
| Attributes | |
| ACN | 328840 |
| Time | |
| Date | 199602 |
| Day | Thu |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : atl |
| State Reference | GA |
| Altitude | msl bound lower : 23600 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | enroute airway : ztl |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 13000 flight time type : 3000 |
| ASRS Report | 328840 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 8000 flight time type : 2500 |
| ASRS Report | 328954 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Aircraft was cleared to descend from FL330 to FL240. The FMS was set for the descent and the descent begun. The aircraft passed through FL240 to FL236 before it was manually corrected back to FL240. The arming mechanism for the altitude alerter apparently malfunctioned.
Original NASA ASRS Text
Title: FLC OVERSHOT ALT WHEN THE FMS PROGRAMMING FAILED TO CAPTURE AT THE ASSIGNED ALT. THE FLC RPTED THAT THE ARMING MECHANISM FOR THE ALT ALERTER APPARENTLY MALFUNCTIONED.
Narrative: ACFT WAS CLRED TO DSND FROM FL330 TO FL240. THE FMS WAS SET FOR THE DSCNT AND THE DSCNT BEGUN. THE ACFT PASSED THROUGH FL240 TO FL236 BEFORE IT WAS MANUALLY CORRECTED BACK TO FL240. THE ARMING MECHANISM FOR THE ALT ALERTER APPARENTLY MALFUNCTIONED.
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.