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An L1011 flight crew report on an altitude overshoot that occurred when the autoplt's altitude capture failed to level the aircraft at FL240 while descending 50 mi northeast of jfk, ny.
| Attributes | |
| ACN | 455870 |
| Time | |
| Date | 199911 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : jfk.airport |
| State Reference | NY |
| Altitude | msl bound lower : 23600 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | L-1011 Tri-Star All Series |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : flight engineer pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 16500 flight time type : 5000 |
| ASRS Report | 455870 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 7000 flight time type : 2000 |
| ASRS Report | 455642 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Autoplt failed to capture assigned altitude on descent from FL330 to FL240. I immediately initiated recovery but descended 300-400 ft below FL240. No conflict was noted and ATC did not mention it to us.
Original NASA ASRS Text
Title: AN L1011 FLC RPT ON AN ALT OVERSHOOT THAT OCCURRED WHEN THE AUTOPLT'S ALT CAPTURE FAILED TO LEVEL THE ACFT AT FL240 WHILE DSNDING 50 MI NE OF JFK, NY.
Narrative: AUTOPLT FAILED TO CAPTURE ASSIGNED ALT ON DSCNT FROM FL330 TO FL240. I IMMEDIATELY INITIATED RECOVERY BUT DSNDED 300-400 FT BELOW FL240. NO CONFLICT WAS NOTED AND ATC DID NOT MENTION IT TO US.
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.