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ZID ARTCC radar controller descended a B712 to an altitude occupied by a regional jet resulting in a loss of separation.
| Attributes | |
| ACN | 551753 |
| Time | |
| Date | 200206 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : iiu.vortac |
| State Reference | KY |
| Altitude | msl bound lower : 33000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B717 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Challenger Jet Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 2 controller radar : 12 controller time certified in position1 : 12 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert atc equipment other atc equipment : radar mode c other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 22200 vertical : 1200 |
| Supplementary | |
| Problem Areas | Environmental Factor ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was 1 of 4 aircraft at FL350 that were vectored for traffic. Air carrier Z and air carrier U were on swap rtes to ord. These 3 aircraft were vectored to miss air carrier V. There was some confusion about the routing to ord. Air carrier U needed to be given a different route. Air carrier Y was sebound at FL330. Air carrier X was descended to FL330 as per operating procedures for mdw arrs. He was also cleared on course to iiu. The next clearance was to issue the rerte to air carrier U. At that time, conflict alert was activated. Air carrier X was turned 25 degrees left. Air carrier Y was turned 20 degrees left. Separation was lost. Air carrier Y was overlooked as traffic at the time air carrier X was descended.
Original NASA ASRS Text
Title: ZID ARTCC RADAR CTLR DSNDED A B712 TO AN ALT OCCUPIED BY A REGIONAL JET RESULTING IN A LOSS OF SEPARATION.
Narrative: ACR X WAS 1 OF 4 ACFT AT FL350 THAT WERE VECTORED FOR TFC. ACR Z AND ACR U WERE ON SWAP RTES TO ORD. THESE 3 ACFT WERE VECTORED TO MISS ACR V. THERE WAS SOME CONFUSION ABOUT THE ROUTING TO ORD. ACR U NEEDED TO BE GIVEN A DIFFERENT RTE. ACR Y WAS SEBOUND AT FL330. ACR X WAS DSNDED TO FL330 AS PER OPERATING PROCS FOR MDW ARRS. HE WAS ALSO CLRED ON COURSE TO IIU. THE NEXT CLRNC WAS TO ISSUE THE RERTE TO ACR U. AT THAT TIME, CONFLICT ALERT WAS ACTIVATED. ACR X WAS TURNED 25 DEGS L. ACR Y WAS TURNED 20 DEGS L. SEPARATION WAS LOST. ACR Y WAS OVERLOOKED AS TFC AT THE TIME ACR X WAS DSNDED.
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.