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An small transport was inadvertently issued a descent that conflicted with opposite direction traffic resulting in less than standard separation.
| Attributes | |
| ACN | 118560 |
| Time | |
| Date | 198908 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : roa |
| State Reference | VA |
| Altitude | msl bound lower : 8400 msl bound upper : 9000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc tower : tus |
| Operator | general aviation : personal |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 118560 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was busy working the rdu rush and was involved with a complex control problem just south of roa, when my left side controller pointed out a potential system error in the vicinity of rnl. Small transport X was descending to 7000 swbnd and small transport Y was at 9000 eastbound. Small transport X was leaving 9800 and I knew I could not get him back up to 10,000 in time. I turned small transport X to a 180 degree heading and requested he expedite his descent. I also turned small transport Y north. Apparently when I turned small transport X south, I issued a right turn (300 degree). The aircraft passed with about 1 mile and 6 hundred feet. A left turn to 180 degree would probably have resulted in approved separation.
Original NASA ASRS Text
Title: AN SMT WAS INADVERTENTLY ISSUED A DESCENT THAT CONFLICTED WITH OPPOSITE DIRECTION TRAFFIC RESULTING IN LESS THAN STANDARD SEPARATION.
Narrative: I WAS BUSY WORKING THE RDU RUSH AND WAS INVOLVED WITH A COMPLEX CTL PROBLEM JUST SOUTH OF ROA, WHEN MY LEFT SIDE CTLR POINTED OUT A POTENTIAL SYSTEM ERROR IN THE VICINITY OF RNL. SMT X WAS DESCENDING TO 7000 SWBND AND SMT Y WAS AT 9000 EBND. SMT X WAS LEAVING 9800 AND I KNEW I COULD NOT GET HIM BACK UP TO 10,000 IN TIME. I TURNED SMT X TO A 180 DEG HDG AND REQUESTED HE EXPEDITE HIS DSCNT. I ALSO TURNED SMT Y NORTH. APPARENTLY WHEN I TURNED SMT X SOUTH, I ISSUED A RIGHT TURN (300 DEG). THE ACFT PASSED WITH ABOUT 1 MILE AND 6 HUNDRED FEET. A LEFT TURN TO 180 DEG WOULD PROBABLY HAVE RESULTED IN APPROVED SEPARATION.
Data retrieved from NASA's ASRS site as of August 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.