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ZID controller experienced operational error at FL360 during attempts to vector one aircraft behind another.
| Attributes | |
| ACN | 662024 |
| Time | |
| Date | 200506 |
| Place | |
| Locale Reference | navaid : ape.vortac |
| State Reference | OH |
| Altitude | msl single value : 36000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller limited radar : 1 controller non radar : 2 controller radar : 19 controller supervisory : 1 |
| ASRS Report | 662024 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar controller : supervisor |
| Qualification | controller : radar |
| Experience | controller radar : 15 controller time certified in position1 : 10 |
| ASRS Report | 662177 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance controller : issued alert |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 28000 vertical : 200 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft Y nwbound at FL360. Aircraft X wbound at FL360. Winds strong out of northeast. Turned aircraft X 15 degrees left to go behind the aircraft Y. Aircraft X picked up speed as he turned out of the wind. Turned act X another 10 degrees left. Moments later; and he gained more speed. Turned aircraft X 20 degrees left about 90 seconds later. Turns were insufficient to maintain separation. Descended aircraft X to FL350. Lost separation before the aircraft leveled at FL350. I tried to finesse aircraft X behind aircraft Y. I was aware of the conflict. My turns were too little based on the speed aircraft X picked up turning out of the wind. I was not busy; and my vectors were not crisp enough to keep the aircraft separated.
Original NASA ASRS Text
Title: ZID CTLR EXPERIENCED OPERROR AT FL360 DURING ATTEMPTS TO VECTOR ONE ACFT BEHIND ANOTHER.
Narrative: ACFT Y NWBOUND AT FL360. ACFT X WBOUND AT FL360. WINDS STRONG OUT OF NE. TURNED ACFT X 15 DEGS L TO GO BEHIND THE ACFT Y. ACFT X PICKED UP SPD AS HE TURNED OUT OF THE WIND. TURNED ACT X ANOTHER 10 DEGS L. MOMENTS LATER; AND HE GAINED MORE SPD. TURNED ACFT X 20 DEGS L ABOUT 90 SECONDS LATER. TURNS WERE INSUFFICIENT TO MAINTAIN SEPARATION. DSNDED ACFT X TO FL350. LOST SEPARATION BEFORE THE ACFT LEVELED AT FL350. I TRIED TO FINESSE ACFT X BEHIND ACFT Y. I WAS AWARE OF THE CONFLICT. MY TURNS WERE TOO LITTLE BASED ON THE SPD ACFT X PICKED UP TURNING OUT OF THE WIND. I WAS NOT BUSY; AND MY VECTORS WERE NOT CRISP ENOUGH TO KEEP THE ACFT SEPARATED.
Data retrieved from NASA's ASRS site as of January 2009 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.