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ARTCC controller misjudged separation vectors for a B737 and an MD80 descends due to strong crosswind causing loss of standard separation.
| Attributes | |
| ACN | 491897 |
| Time | |
| Date | 200011 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : jfk.vor |
| State Reference | NY |
| Altitude | msl single value : 25000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar pilot : instrument |
| Experience | controller radar : 2 controller time certified in position1 : 2 flight time total : 500 |
| ASRS Report | 491897 |
| 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 : radar other controllera |
| Resolutory Action | controller : separated traffic |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 12000 vertical : 800 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I descended both aircraft thinking separation was ensured. I was dealing with a possible conflict which was more of a priority. I noticed 1 aircraft who's descent rate was not good enough which I corrected. This was not working so I turned the air carrier X to the north. Strong northwest winds, also a delayed turn up to 30 seconds by the aircraft, helped cause loss of separation.
Original NASA ASRS Text
Title: ARTCC CTLR MISJUDGED SEPARATION VECTORS FOR A B737 AND AN MD80 DSNDS DUE TO STRONG XWIND CAUSING LOSS OF STANDARD SEPARATION.
Narrative: I DSNDED BOTH ACFT THINKING SEPARATION WAS ENSURED. I WAS DEALING WITH A POSSIBLE CONFLICT WHICH WAS MORE OF A PRIORITY. I NOTICED 1 ACFT WHO'S DSCNT RATE WAS NOT GOOD ENOUGH WHICH I CORRECTED. THIS WAS NOT WORKING SO I TURNED THE ACR X TO THE N. STRONG NW WINDS, ALSO A DELAYED TURN UP TO 30 SECONDS BY THE ACFT, HELPED CAUSE LOSS OF 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.