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ZID controller incorrectly judges winds aloft and loses separation between a carj in a climb and an LJ28 in descent.
| Attributes | |
| ACN | 535311 |
| Time | |
| Date | 200201 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| State Reference | KY |
| Altitude | msl single value : 21000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet CL65, Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | general aviation : personal |
| Make Model Name | Learjet 28 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 9.5 |
| ASRS Report | 535311 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 18000 vertical : 700 |
| Supplementary | |
| Problem Areas | Weather Environmental Factor ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
CRJ1 was climbing from cvg direct jodub. LJ28 was at FL210 direct nikls. LJ28 was turned (for other traffic) direct to EST. Winds were very high (approximately 120 KTS) and the turn reduced the LJ28's ground speed substantially. The CRJ1 was cleared direct to gzg, turning about 50 degrees to the right. With the high tailwinds, the aircraft was slow to turn and lost lateral separation.
Original NASA ASRS Text
Title: ZID CTLR INCORRECTLY JUDGES WINDS ALOFT AND LOSES SEPARATION BTWN A CARJ IN A CLB AND AN LJ28 IN DSCNT.
Narrative: CRJ1 WAS CLBING FROM CVG DIRECT JODUB. LJ28 WAS AT FL210 DIRECT NIKLS. LJ28 WAS TURNED (FOR OTHER TFC) DIRECT TO EST. WINDS WERE VERY HIGH (APPROX 120 KTS) AND THE TURN REDUCED THE LJ28'S GND SPD SUBSTANTIALLY. THE CRJ1 WAS CLRED DIRECT TO GZG, TURNING ABOUT 50 DEGS TO THE R. WITH THE HIGH TAILWINDS, THE ACFT WAS SLOW TO TURN AND LOST LATERAL SEPARATION.
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.