Air carrier Y had less than standard separation from air carrier X. System error.

Attributes
ACN	123772
Time
Date	198909
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : jfk
State Reference	NY
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	Medium Transport, High Wing, 2 Turboprop Eng
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller military : 9 controller radar : 8
ASRS Report	123772
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	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X was making a right 360 at 4000 to avoid possible confliction with aircraft in front. Aircraft behind (air carrier Y, small transport) was turned to avoid area of 360 being done by air carrier X. During air carrier X 360 turn, standard separation was lost. Busy session with 9-10 aircraft on frequency. Aircraft coming in too fast. 2 feeder controllers. One was in training status and 2ND was staff person getting time on position. Better supervision by supervisors considering how busy it was and the status of the feeder controllers.

Original NASA ASRS Text

Title: ACR Y HAD LESS THAN STANDARD SEPARATION FROM ACR X. SYSTEM ERROR.

Narrative: ACR X WAS MAKING A RIGHT 360 AT 4000 TO AVOID POSSIBLE CONFLICTION WITH ACFT IN FRONT. ACFT BEHIND (ACR Y, SMT) WAS TURNED TO AVOID AREA OF 360 BEING DONE BY ACR X. DURING ACR X 360 TURN, STANDARD SEPARATION WAS LOST. BUSY SESSION WITH 9-10 ACFT ON FREQ. ACFT COMING IN TOO FAST. 2 FEEDER CTLRS. ONE WAS IN TRAINING STATUS AND 2ND WAS STAFF PERSON GETTING TIME ON POSITION. BETTER SUPERVISION BY SUPVRS CONSIDERING HOW BUSY IT WAS AND THE STATUS OF THE FEEDER CTLRS.

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