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ZOB controller cleared an arriving B757 through the occupied altitude of an MU2 at cruise altitude resulting in a loss of separation.
| Attributes | |
| ACN | 536643 |
| Time | |
| Date | 200201 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : psb.vortac |
| State Reference | PA |
| Altitude | msl bound lower : 19000 msl bound upper : 19700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other vortac |
| Flight Phase | descent : vacating altitude |
| Route In Use | arrival star : ns |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : charter |
| Make Model Name | M-20 Series Undifferentiated or Other Model |
| Operating Under FAR Part | Part 135 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 536643 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : returned to assigned altitude none taken : detected after the fact |
| Miss Distance | horizontal : 26000 vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
During an inbound push to pit, aircraft #1 was given a crossing clearance of 10000 ft, aircraft #2 was eastbound at FL190. When I noticed the possible confliction, I attempted to stop aircraft #1 from descending since he was still level at FL200. His first response was 'we have started down,' and I attempted to have him stop and climb back up to FL200 with a PIREP of level.
Original NASA ASRS Text
Title: ZOB CTLR CLRED AN ARRIVING B757 THROUGH THE OCCUPIED ALT OF AN MU2 AT CRUISE ALT RESULTING IN A LOSS OF SEPARATION.
Narrative: DURING AN INBOUND PUSH TO PIT, ACFT #1 WAS GIVEN A XING CLRNC OF 10000 FT, ACFT #2 WAS EBOUND AT FL190. WHEN I NOTICED THE POSSIBLE CONFLICTION, I ATTEMPTED TO STOP ACFT #1 FROM DSNDING SINCE HE WAS STILL LEVEL AT FL200. HIS FIRST RESPONSE WAS 'WE HAVE STARTED DOWN,' AND I ATTEMPTED TO HAVE HIM STOP AND CLB BACK UP TO FL200 WITH A PIREP OF LEVEL.
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.