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An aircraft in ZAU, il, airspace drifts 500 ft higher than assigned altitude. Flight crew is unable to explain why that happened.
| Attributes | |
| ACN | 394160 |
| Time | |
| Date | 199802 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ord |
| State Reference | IL |
| Altitude | msl bound lower : 31000 msl bound upper : 31500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau tower : atl |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise 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 : 240 flight time total : 19500 flight time type : 300 |
| ASRS Report | 394160 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera other flight crewa |
| 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:
Flight xx (air carrier) was level at FL310 and discretion to FL290. We were level at FL310 for approximately 5 mins when ZAU inquired about our altitude and we were climbing 200 FPM and passing FL315, 500 ft higher than our assigned altitude. We told ZAU and immediately corrected. Still can't figure out why vertical speed +200 took effect after we were level at FL310 for several mins. Plan to discuss with airbus guru at air carrier airlines.
Original NASA ASRS Text
Title: AN ACFT IN ZAU, IL, AIRSPACE DRIFTS 500 FT HIGHER THAN ASSIGNED ALT. FLC IS UNABLE TO EXPLAIN WHY THAT HAPPENED.
Narrative: FLT XX (ACR) WAS LEVEL AT FL310 AND DISCRETION TO FL290. WE WERE LEVEL AT FL310 FOR APPROX 5 MINS WHEN ZAU INQUIRED ABOUT OUR ALT AND WE WERE CLBING 200 FPM AND PASSING FL315, 500 FT HIGHER THAN OUR ASSIGNED ALT. WE TOLD ZAU AND IMMEDIATELY CORRECTED. STILL CAN'T FIGURE OUT WHY VERT SPD +200 TOOK EFFECT AFTER WE WERE LEVEL AT FL310 FOR SEVERAL MINS. PLAN TO DISCUSS WITH AIRBUS GURU AT ACR AIRLINES.
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.