Narrative:

A340 departed jfk off runway 31L. He was turned to a 130 degree heading about 1 mi prior to reaching cri VOR. He starts turning when A320 departs runway 31L. A340 turns on a dime or it appears that he turns at a better rate than normal. It also appears he is flying more eastbound than expected. I issue A320 a heading on takeoff that will keep him north of A340 as I was not expecting A340 to be turning where he was. A340's are slow climbers on takeoff and are slow to accelerate. There should be extra mi given to aircraft who follow A340's on departure takeoffs so that the following departure takeoff cannot catch or become a factor with the A340 because of the A340 poor performance on departure.

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Original NASA ASRS Text

Title: N90 CONTROLLER DESCRIBED MINIMAL SEPARATION EVENT WHEN AN A340 MADE A WIDE DEPARTURE TURN FOLLOWED BY A SECOND A320 WHO TURNED INSIDE THE A340; REQUIRING IMMEDIATE VECTORS; SUGGESTING ADDITIONAL SEPARATION REQUIRED WITH THIS SCENARIO.

Narrative: A340 DEPARTED JFK OFF RWY 31L. HE WAS TURNED TO A 130 DEG HDG ABOUT 1 MI PRIOR TO REACHING CRI VOR. HE STARTS TURNING WHEN A320 DEPARTS RWY 31L. A340 TURNS ON A DIME OR IT APPEARS THAT HE TURNS AT A BETTER RATE THAN NORMAL. IT ALSO APPEARS HE IS FLYING MORE EBOUND THAN EXPECTED. I ISSUE A320 A HDG ON TKOF THAT WILL KEEP HIM N OF A340 AS I WAS NOT EXPECTING A340 TO BE TURNING WHERE HE WAS. A340'S ARE SLOW CLIMBERS ON TKOF AND ARE SLOW TO ACCELERATE. THERE SHOULD BE EXTRA MI GIVEN TO ACFT WHO FOLLOW A340'S ON DEP TKOFS SO THAT THE FOLLOWING DEP TKOF CANNOT CATCH OR BECOME A FACTOR WITH THE A340 BECAUSE OF THE A340 POOR PERFORMANCE ON DEP.

Data retrieved from NASA's ASRS site as of May 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.