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ZAU controller descends DC9 into conflict with BE10. Actions insufficient to ensure legal separation.
| Attributes | |
| ACN | 524011 |
| Time | |
| Date | 200109 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : dpa.airport |
| State Reference | IL |
| Altitude | msl bound lower : 23000 msl bound upper : 23500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | general aviation : corporate |
| Make Model Name | King Air 100 A/B |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : developmental pilot : instrument |
| Experience | controller radar : 1 controller time certified in position1 : 0.5 flight time total : 1200 |
| ASRS Report | 524011 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert atc equipment other atc equipment : radar other controllera |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 27600 vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
The king air was eastbound at FL230. I descended the other plane to FL170. Realizing it wasn't going to work, I told him to maintain FL240. I couldn't see his data block because of overlap with several others. I then told the king air to fly a 360 degree heading and the other plane a 050 degree heading. After they were clear, I put the king air on course and descended the other aircraft.
Original NASA ASRS Text
Title: ZAU CTLR DSNDS DC9 INTO CONFLICT WITH BE10. ACTIONS INSUFFICIENT TO ENSURE LEGAL SEPARATION.
Narrative: THE KING AIR WAS EBOUND AT FL230. I DSNDED THE OTHER PLANE TO FL170. REALIZING IT WASN'T GOING TO WORK, I TOLD HIM TO MAINTAIN FL240. I COULDN'T SEE HIS DATA BLOCK BECAUSE OF OVERLAP WITH SEVERAL OTHERS. I THEN TOLD THE KING AIR TO FLY A 360 DEG HDG AND THE OTHER PLANE A 050 DEG HDG. AFTER THEY WERE CLR, I PUT THE KING AIR ON COURSE AND DSNDED THE OTHER 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.