Atx X had less than standard separation from atx Y. System error.

Attributes
ACN	203932
Time
Date	199203
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : cmk
State Reference	NY
Altitude	msl bound lower : 13000 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Small Aircraft
Flight Phase	cruise other
Route In Use	enroute : direct enroute airway : zbw
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air taxi
Make Model Name	Small Aircraft
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
ASRS Report	203932
Person 2
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : investigated
Miss Distance	horizontal : 27900 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Intra Facility Coordination Failure Operational Error

Narrative:

1) atx X -- ewr bays seall V188 tmv. 2) atx Y jfk merit orw V16 bos. N90 gave approval for shift to R-20 for 'control for turns all aircraft climb 13000. (Lga radar unusable). Atx Y came over 'left on 050 heading by approach.' I turned atx Y direct orw and the aircraft conflicted with atx X (4.65). I turned atx Y 30 degrees left and climbed to 15000. I misjudged the angle of turn, and I wrongly thought atx X was proceeding bays direct tmo.

Original NASA ASRS Text

Title: ATX X HAD LTSS FROM ATX Y. SYS ERROR.

Narrative: 1) ATX X -- EWR BAYS SEALL V188 TMV. 2) ATX Y JFK MERIT ORW V16 BOS. N90 GAVE APPROVAL FOR SHIFT TO R-20 FOR 'CTL FOR TURNS ALL ACFT CLB 13000. (LGA RADAR UNUSABLE). ATX Y CAME OVER 'L ON 050 HDG BY APCH.' I TURNED ATX Y DIRECT ORW AND THE ACFT CONFLICTED WITH ATX X (4.65). I TURNED ATX Y 30 DEGS L AND CLBED TO 15000. I MISJUDGED THE ANGLE OF TURN, AND I WRONGLY THOUGHT ATX X WAS PROCEEDING BAYS DIRECT TMO.

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.