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ARTCC radar controller issued descent clearance to an aircraft and it conflicts with another aircraft level at FL280.
| Attributes | |
| ACN | 160834 |
| Time | |
| Date | 199010 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : ccv |
| State Reference | VA |
| Altitude | msl bound lower : 28000 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 160834 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
On 10/thu/90, I was working the xx to X0 shift at ZDC. At XX00 local I was at the R54 sector with a moderate or grater level of traffic. I descended medium large transport from FL290 to FL240. Shortly thereafter the C/a was activated and I became aware of a conflict with widebody transport at FL280. I issued medium large transport a turn to heading 090 degrees and called traffic. Medium large transport accepted clearance and called traffic in sight. Widebody transport was issued a turn to 270 degrees and traffic was called. Widebody transport read back the clearance and called the traffic in sight. The aircraft passed with horizontal sep and were cleared back on course.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR ISSUED DESCENT CLRNC TO AN ACFT AND IT CONFLICTS WITH ANOTHER ACFT LEVEL AT FL280.
Narrative: ON 10/THU/90, I WAS WORKING THE XX TO X0 SHIFT AT ZDC. AT XX00 LCL I WAS AT THE R54 SECTOR WITH A MODERATE OR GRATER LEVEL OF TFC. I DSNDED MLG FROM FL290 TO FL240. SHORTLY THEREAFTER THE C/A WAS ACTIVATED AND I BECAME AWARE OF A CONFLICT WITH WDB AT FL280. I ISSUED MLG A TURN TO HDG 090 DEGS AND CALLED TFC. MLG ACCEPTED CLRNC AND CALLED TFC IN SIGHT. WDB WAS ISSUED A TURN TO 270 DEGS AND TFC WAS CALLED. WDB READ BACK THE CLRNC AND CALLED THE TFC IN SIGHT. THE ACFT PASSED WITH HORIZ SEP AND WERE CLRED BACK ON COURSE.
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.