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Operational error incident review clarifies that ZAU controller issued incorrect altitude to descending A319 which conflicted with an en route B190.
| Attributes | |
| ACN | 543574 |
| Time | |
| Date | 200204 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : gsh.airport |
| State Reference | IN |
| Altitude | msl bound lower : 24000 msl bound upper : 25000 |
| Environment | |
| Weather Elements | Turbulence |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air taxi |
| Make Model Name | Beech 1900 |
| Operating Under FAR Part | Part 135 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 18 |
| ASRS Report | 543574 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 21000 vertical : 200 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
I thought I descended A319 to FL250, but after review of the tape I had descended A319 to FL240. I did not realize this till A319 started to descend through FL250. B190 was at FL240. I tried to stop A319 at FL250 and turned A319 to a 260 degree heading, but at this point there was already loss of separation.
Original NASA ASRS Text
Title: OPERROR INCIDENT REVIEW CLARIFIES THAT ZAU CTLR ISSUED INCORRECT ALT TO DSNDING A319 WHICH CONFLICTED WITH AN ENRTE B190.
Narrative: I THOUGHT I DSNDED A319 TO FL250, BUT AFTER REVIEW OF THE TAPE I HAD DSNDED A319 TO FL240. I DID NOT REALIZE THIS TILL A319 STARTED TO DSND THROUGH FL250. B190 WAS AT FL240. I TRIED TO STOP A319 AT FL250 AND TURNED A319 TO A 260 DEG HDG, BUT AT THIS POINT THERE WAS ALREADY LOSS OF 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.