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ZAU controller substitutes aircraft positioning and climbs the wrong aircraft through the altitude of the other aircraft.
| Attributes | |
| ACN | 439049 |
| Time | |
| Date | 199906 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : fwa.vortac |
| State Reference | IN |
| Altitude | msl bound lower : 27000 msl bound upper : 27300 |
| Environment | |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 439049 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 19000 vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was climbing off dtw for stl, air carrier Y was climbing off cmh for mdw. Each requested FL310, but due to traffic, air carrier X was stopped at FL280 and air carrier Y at FL270. I intended to descend air carrier Y to FL240, but instead issued FL310, causing a loss of separation. When I noticed air carrier Y at FL273, I descended him to FL240, but not before losing separation.
Original NASA ASRS Text
Title: ZAU CTLR SUBSTITUTES ACFT POSITIONING AND CLBS THE WRONG ACFT THROUGH THE ALT OF THE OTHER ACFT.
Narrative: ACR X WAS CLBING OFF DTW FOR STL, ACR Y WAS CLBING OFF CMH FOR MDW. EACH REQUESTED FL310, BUT DUE TO TFC, ACR X WAS STOPPED AT FL280 AND ACR Y AT FL270. I INTENDED TO DSND ACR Y TO FL240, BUT INSTEAD ISSUED FL310, CAUSING A LOSS OF SEPARATION. WHEN I NOTICED ACR Y AT FL273, I DSNDED HIM TO FL240, BUT NOT BEFORE LOSING SEPARATION.
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.