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Flight crew of an medium large transport overshot intermediate descent altitude due to a malfunctioning autoplt which the captain had to manually override in order to stop the aircraft's increasing descent rate.
| Attributes | |
| ACN | 506156 |
| Time | |
| Date | 200103 |
| Day | Sat |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : mco.airport |
| State Reference | FL |
| Altitude | msl bound lower : 23700 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 230 flight time total : 12000 flight time type : 3000 |
| ASRS Report | 506156 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : overrode automation flight crew : returned to assigned altitude |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Descending through FL250, autoplt #1 began increasing nose down pitch, to level off at FL240. At about FL245, vertical speed was about 3500 FPM down and increasing. The captain disconnected the autoplt using the disconnect button on his yoke, but the autoplt did not disconnect, and we were descending at about 5000 FPM when captain manually pulled back on yoke to disconnect autoplt. We leveled off at FL237 and climbed back to assigned altitude of FL240. We then told ZJX of the malfunction and continued to land at mco.
Original NASA ASRS Text
Title: FLC OF AN MLG OVERSHOT INTERMEDIATE DSCNT ALT DUE TO A MALFUNCTIONING AUTOPLT WHICH THE CAPT HAD TO MANUALLY OVERRIDE IN ORDER TO STOP THE ACFT'S INCREASING DSCNT RATE.
Narrative: DSNDING THROUGH FL250, AUTOPLT #1 BEGAN INCREASING NOSE DOWN PITCH, TO LEVEL OFF AT FL240. AT ABOUT FL245, VERT SPD WAS ABOUT 3500 FPM DOWN AND INCREASING. THE CAPT DISCONNECTED THE AUTOPLT USING THE DISCONNECT BUTTON ON HIS YOKE, BUT THE AUTOPLT DID NOT DISCONNECT, AND WE WERE DSNDING AT ABOUT 5000 FPM WHEN CAPT MANUALLY PULLED BACK ON YOKE TO DISCONNECT AUTOPLT. WE LEVELED OFF AT FL237 AND CLBED BACK TO ASSIGNED ALT OF FL240. WE THEN TOLD ZJX OF THE MALFUNCTION AND CONTINUED TO LAND AT MCO.
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.