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An A320 descends through cleared altitude of 11000 ft to 10000 ft as a result of the captain bumping the altitude selector switch.
| Attributes | |
| ACN | 392620 |
| Time | |
| Date | 199801 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ord |
| State Reference | IL |
| Altitude | msl bound lower : 10000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 7000 flight time type : 800 |
| ASRS Report | 392620 |
| 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 controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were cleared to descend to 11000 ft out of FL230. I was the PF and set 11000 ft in the altitude selector. The first officer and I both verified the altitude on our primary flight displays. The altitude selector was set to 1000's versus 100' increments, per company procedures. I believe I accidentally bumped the knob, changing the altitude to 10000 ft. Upon reaching 10000 ft, ATC told us to climb and maintain 11000 ft, which we did. I believe fatigue may have played a part in this. I have been aloft more than 100 hours in the past 20 days.
Original NASA ASRS Text
Title: AN A320 DSNDS THROUGH CLRED ALT OF 11000 FT TO 10000 FT AS A RESULT OF THE CAPT BUMPING THE ALT SELECTOR SWITCH.
Narrative: WE WERE CLRED TO DSND TO 11000 FT OUT OF FL230. I WAS THE PF AND SET 11000 FT IN THE ALT SELECTOR. THE FO AND I BOTH VERIFIED THE ALT ON OUR PRIMARY FLT DISPLAYS. THE ALT SELECTOR WAS SET TO 1000'S VERSUS 100' INCREMENTS, PER COMPANY PROCS. I BELIEVE I ACCIDENTALLY BUMPED THE KNOB, CHANGING THE ALT TO 10000 FT. UPON REACHING 10000 FT, ATC TOLD US TO CLB AND MAINTAIN 11000 FT, WHICH WE DID. I BELIEVE FATIGUE MAY HAVE PLAYED A PART IN THIS. I HAVE BEEN ALOFT MORE THAN 100 HRS IN THE PAST 20 DAYS.
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.