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An air carrier DC9 flight crew reports that they went 200 ft below their assigned altitude when their autoplt reacted too slowly to its leveloff command.
| Attributes | |
| ACN | 382740 |
| Time | |
| Date | 199710 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ftz |
| State Reference | MO |
| Altitude | msl bound lower : 14800 msl bound upper : 15000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : stl |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 18000 flight time type : 13000 |
| ASRS Report | 382740 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence : far |
| Independent Detector | 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:
Went 200 ft below 15000 ft when leveling at 15000 ft in a descent. First officer flying. We were aware of altitude. Autoplt was slow to stop sink rate. First officer corrected immediately.
Original NASA ASRS Text
Title: AN ACR DC9 FLC RPTS THAT THEY WENT 200 FT BELOW THEIR ASSIGNED ALT WHEN THEIR AUTOPLT REACTED TOO SLOWLY TO ITS LEVELOFF COMMAND.
Narrative: WENT 200 FT BELOW 15000 FT WHEN LEVELING AT 15000 FT IN A DSCNT. FO FLYING. WE WERE AWARE OF ALT. AUTOPLT WAS SLOW TO STOP SINK RATE. FO CORRECTED IMMEDIATELY.
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.