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ZOB controller experienced operational error at 8000 ft during descent of 2 aircraft on parallel courses.
| Attributes | |
| ACN | 620289 |
| Time | |
| Date | 200405 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : pit.airport |
| State Reference | PA |
| Altitude | msl single value : 8000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air taxi |
| Make Model Name | MU-2 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 135 |
| Flight Phase | cruise : level descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | SF 340B |
| 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 time certified in position1 : 3 controller time certified in position2 : 6 |
| ASRS Report | 620289 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | vertical : 600 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
2 aircraft on parallel courses and aircraft X was at 8000 ft and issued 7000 ft. Aircraft Y was at 9000 ft and issued 8000 ft when it was assumed aircraft X had started descent to 7000 ft showing 7900 ft in data block. Another aircraft blocked aircraft X readback and the pilot said he never got the descent clearance. Contributing factors would be the noise level in the control room with a lot of background noise and speakers blaring.
Original NASA ASRS Text
Title: ZOB CTLR EXPERIENCED OPERROR AT 8000 FT DURING DSCNT OF 2 ACFT ON PARALLEL COURSES.
Narrative: 2 ACFT ON PARALLEL COURSES AND ACFT X WAS AT 8000 FT AND ISSUED 7000 FT. ACFT Y WAS AT 9000 FT AND ISSUED 8000 FT WHEN IT WAS ASSUMED ACFT X HAD STARTED DSCNT TO 7000 FT SHOWING 7900 FT IN DATA BLOCK. ANOTHER ACFT BLOCKED ACFT X READBACK AND THE PLT SAID HE NEVER GOT THE DSCNT CLRNC. CONTRIBUTING FACTORS WOULD BE THE NOISE LEVEL IN THE CTL ROOM WITH A LOT OF BACKGROUND NOISE AND SPEAKERS BLARING.
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.