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ARTCC radar controller handling traffic at ZOB had loss of separation between a northbound aircraft at FL330 and a wbound aircraft descending to FL310.
| Attributes | |
| ACN | 541272 |
| Time | |
| Date | 200202 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zob.artcc |
| State Reference | OH |
| Altitude | msl single value : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 18 controller radar : 10 |
| ASRS Report | 541272 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical non adherence : far non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | atc equipment : conflict alert atc equipment other atc equipment : radar mode c |
| Resolutory Action | none taken : detected after the fact |
| Miss Distance | horizontal : 18000 vertical : 400 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Wbound aircraft at FL350 wanted lower. I issued a descent to FL310. Northbound aircraft was at FL330. I misjudged the speed of the northbound aircraft due to strong winds and before I could correct this situation, separation was lost. I tried to turn both aircraft but with the speed difference it was not enough to avoid loss of separation.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR HANDLING TFC AT ZOB HAD LOSS OF SEPARATION BTWN A NBOUND ACFT AT FL330 AND A WBOUND ACFT DSNDING TO FL310.
Narrative: WBOUND ACFT AT FL350 WANTED LOWER. I ISSUED A DSCNT TO FL310. NBOUND ACFT WAS AT FL330. I MISJUDGED THE SPD OF THE NBOUND ACFT DUE TO STRONG WINDS AND BEFORE I COULD CORRECT THIS SIT, SEPARATION WAS LOST. I TRIED TO TURN BOTH ACFT BUT WITH THE SPD DIFFERENCE IT WAS NOT ENOUGH TO AVOID 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.