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Altitude deviation on climb. The altitude was selected and armed in the altitude window, but inadvertently disarmed by bumping the vertical speed wheel. Flight crew distraction with other duties as aircraft was approaching leveloff altitude, and didn't catch the altitude deviation until the aircraft had climbed 500 ft.
| Attributes | |
| ACN | 333580 |
| Time | |
| Date | 199603 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : rbs |
| State Reference | IL |
| Altitude | msl bound lower : 24000 msl bound upper : 24500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau tower : yfb |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : instrument pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 100 flight time total : 6000 flight time type : 175 |
| ASRS Report | 333580 |
| Person 2 | |
| 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 : 180 flight time total : 16000 flight time type : 900 |
| ASRS Report | 333476 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| 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:
On departure from ord, center cleared us to FL240. Altitude selector set and armed for FL240. Aircraft was climbing at approximately 4000 FPM. Aircraft continued to climb through FL240, and reached FL245 before corrective action initiated. Speculate, one of the pilots inadvertently bumped vertical speed wheel close to altitude capture, disengaged the armed altitude. At the time of excursion, pilots were involved in changing frequency, re- establishing navaids (cleared direct) (slightly distraction).
Original NASA ASRS Text
Title: ALTDEV ON CLB. THE ALT WAS SELECTED AND ARMED IN THE ALT WINDOW, BUT INADVERTENTLY DISARMED BY BUMPING THE VERT SPD WHEEL. FLC DISTR WITH OTHER DUTIES AS ACFT WAS APCHING LEVELOFF ALT, AND DIDN'T CATCH THE ALTDEV UNTIL THE ACFT HAD CLBED 500 FT.
Narrative: ON DEP FROM ORD, CTR CLRED US TO FL240. ALT SELECTOR SET AND ARMED FOR FL240. ACFT WAS CLBING AT APPROX 4000 FPM. ACFT CONTINUED TO CLB THROUGH FL240, AND REACHED FL245 BEFORE CORRECTIVE ACTION INITIATED. SPECULATE, ONE OF THE PLTS INADVERTENTLY BUMPED VERT SPD WHEEL CLOSE TO ALT CAPTURE, DISENGAGED THE ARMED ALT. AT THE TIME OF EXCURSION, PLTS WERE INVOLVED IN CHANGING FREQ, RE- ESTABLISHING NAVAIDS (CLRED DIRECT) (SLIGHTLY DISTR).
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.