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ZAU ARTCC radar controller descends wrong aircraft that results in a loss of separation with opposite direction traffic.
| Attributes | |
| ACN | 587982 |
| Time | |
| Date | 200307 |
| Day | Mon |
| Place | |
| Locale Reference | navaid : mkg.vortac |
| State Reference | MI |
| Altitude | msl bound lower : 29000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc tower : pdx.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change descent : vacating altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller time certified in position1 : 10 flight time total : 1600 |
| ASRS Report | 587982 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : radar / mode c other controllera other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Miss Distance | horizontal : 6000 vertical : 1000 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
Aircraft X at FL290 and aircraft Y at FL330 both to dtw. Both needed to descend, but aircraft Y at FL330 had 3 aircraft opposite direction at FL310 that were traffic. I descended aircraft Y thinking I descended aircraft X. Aircraft Y lost separation with one of the opposite direction aircraft at FL310.
Original NASA ASRS Text
Title: ZAU ARTCC RADAR CTLR DSNDS WRONG ACFT THAT RESULTS IN A LOSS OF SEPARATION WITH OPPOSITE DIRECTION TFC.
Narrative: ACFT X AT FL290 AND ACFT Y AT FL330 BOTH TO DTW. BOTH NEEDED TO DSND, BUT ACFT Y AT FL330 HAD 3 ACFT OPPOSITE DIRECTION AT FL310 THAT WERE TFC. I DSNDED ACFT Y THINKING I DSNDED ACFT X. ACFT Y LOST SEPARATION WITH ONE OF THE OPPOSITE DIRECTION ACFT AT FL310.
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.