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ZOB controller misjudges crossing situation between an en route BE9T and a descending pase resulting in loss of separation. Controller attributes distraction working with new dsr equipment.
| Attributes | |
| ACN | 440490 |
| Time | |
| Date | 199906 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| State Reference | OH |
| Altitude | msl single value : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | general aviation : personal |
| Make Model Name | PA-34-200 Seneca I |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Beech F90 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : enroute altitude change |
| Route In Use | enroute airway : v117.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller radar : 11 |
| ASRS Report | 440490 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 27000 vertical : 0 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft X was sebound at 11000 ft, proceeding direct to gso. Aircraft Y was over jpu nebound at 13000 ft flying V117 air V117 wiske 8g7. I issued aircraft Y a clearance to cross wiske at 7000 ft. I thought aircraft Y would pass behind aircraft X. I got busy with entries into the computer and flight strips and when I looked back at the scope the conflict alert was flashing. I turned aircraft Y left to a 360 degree heading and asked him to expedite his descent. After the readback, I turned him further left to a 330 degree heading. I feel I overlooked the speeds of the 2 aircraft and thought aircraft X would be further southeast of his flight path. I also feel that having to look down at the keys to make entries on the new dsr equipment and the difficulty of reading the new strips took time away from watching the scope. A more careful scan and more time on the dsr equipment should correct the problems.
Original NASA ASRS Text
Title: ZOB CTLR MISJUDGES XING SIT BTWN AN ENRTE BE9T AND A DSNDING PASE RESULTING IN LOSS OF SEPARATION. CTLR ATTRIBUTES DISTR WORKING WITH NEW DSR EQUIP.
Narrative: ACFT X WAS SEBOUND AT 11000 FT, PROCEEDING DIRECT TO GSO. ACFT Y WAS OVER JPU NEBOUND AT 13000 FT FLYING V117 AIR V117 WISKE 8G7. I ISSUED ACFT Y A CLRNC TO CROSS WISKE AT 7000 FT. I THOUGHT ACFT Y WOULD PASS BEHIND ACFT X. I GOT BUSY WITH ENTRIES INTO THE COMPUTER AND FLT STRIPS AND WHEN I LOOKED BACK AT THE SCOPE THE CONFLICT ALERT WAS FLASHING. I TURNED ACFT Y L TO A 360 DEG HDG AND ASKED HIM TO EXPEDITE HIS DSCNT. AFTER THE READBACK, I TURNED HIM FURTHER L TO A 330 DEG HDG. I FEEL I OVERLOOKED THE SPDS OF THE 2 ACFT AND THOUGHT ACFT X WOULD BE FURTHER SE OF HIS FLT PATH. I ALSO FEEL THAT HAVING TO LOOK DOWN AT THE KEYS TO MAKE ENTRIES ON THE NEW DSR EQUIP AND THE DIFFICULTY OF READING THE NEW STRIPS TOOK TIME AWAY FROM WATCHING THE SCOPE. A MORE CAREFUL SCAN AND MORE TIME ON THE DSR EQUIP SHOULD CORRECT THE PROBS.
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.