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DC10 crew had altitude overshoot caused by improper flight guidance operation in ZOB class a airspace.
| Attributes | |
| ACN | 501040 |
| Time | |
| Date | 200102 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : dxo.vor |
| State Reference | MI |
| Altitude | msl bound lower : 20700 msl bound upper : 21000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | descent : vacating altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : multi engine pilot : instrument |
| Experience | flight time last 90 days : 170 flight time total : 11000 flight time type : 1700 |
| ASRS Report | 501040 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : company policies non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment : altitude alert other flight crewa other flight crewb other other : 3 |
| Resolutory Action | flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
The altitude arming function on the autoplt was accidentally disengaged and the aircraft did not level off at the assigned altitude of FL210 (descending). We flew down to FL207.5-FL207, and I then corrected back to altitude immediately. ATC did not notice anything and we verified our assigned altitude. No conflicts were reported. The main reason that I believe the incident occurred was due to my distraction on slowing the aircraft not per ATC instructions. I slowed the aircraft by shallowing out the descent with the vertical speed function of the autoplt. On the DC10, sometimes if you make a vertical speed change after the altitude capture starts, the altitude arm will disengage.
Original NASA ASRS Text
Title: DC10 CREW HAD ALT OVERSHOOT CAUSED BY IMPROPER FLT GUIDANCE OP IN ZOB CLASS A AIRSPACE.
Narrative: THE ALT ARMING FUNCTION ON THE AUTOPLT WAS ACCIDENTALLY DISENGAGED AND THE ACFT DID NOT LEVEL OFF AT THE ASSIGNED ALT OF FL210 (DSNDING). WE FLEW DOWN TO FL207.5-FL207, AND I THEN CORRECTED BACK TO ALT IMMEDIATELY. ATC DID NOT NOTICE ANYTHING AND WE VERIFIED OUR ASSIGNED ALT. NO CONFLICTS WERE RPTED. THE MAIN REASON THAT I BELIEVE THE INCIDENT OCCURRED WAS DUE TO MY DISTR ON SLOWING THE ACFT NOT PER ATC INSTRUCTIONS. I SLOWED THE ACFT BY SHALLOWING OUT THE DSCNT WITH THE VERT SPD FUNCTION OF THE AUTOPLT. ON THE DC10, SOMETIMES IF YOU MAKE A VERT SPD CHANGE AFTER THE ALT CAPTURE STARTS, THE ALT ARM WILL DISENGAGE.
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.