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Flight crew of an air carrier medium large transport asked for and received a lower en route altitude assignment and then after descending to that altitude, were informed that their descent had caused a conflict.
| Attributes | |
| ACN | 439880 |
| Time | |
| Date | 199906 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : obk.vor |
| State Reference | IL |
| Altitude | msl bound lower : 29000 msl bound upper : 30700 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 150 flight time total : 14800 flight time type : 8000 |
| ASRS Report | 439880 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Miss Distance | horizontal : 27000 vertical : 1400 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Cleared to FL330 and climbing through FL290, we called ATC requesting FL290 as a final altitude. Climbing through FL307, ATC cleared us to descend and maintain FL290. We descended. This apparently caused a conflict with another aircraft.
Original NASA ASRS Text
Title: FLC OF AN ACR MLG ASKED FOR AND RECEIVED A LOWER ENRTE ALT ASSIGNMENT AND THEN AFTER DSNDING TO THAT ALT, WERE INFORMED THAT THEIR DSCNT HAD CAUSED A CONFLICT.
Narrative: CLRED TO FL330 AND CLBING THROUGH FL290, WE CALLED ATC REQUESTING FL290 AS A FINAL ALT. CLBING THROUGH FL307, ATC CLRED US TO DSND AND MAINTAIN FL290. WE DSNDED. THIS APPARENTLY CAUSED A CONFLICT WITH ANOTHER ACFT.
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.