N90 controller providing OJT was late in taking control of the position and lost separation.

Attributes
ACN	578270
Time
Date	200304
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : jfk.airport
State Reference	NY
Altitude	msl single value : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90.tracon
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : n90.tracon
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 135 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach controller : handoff position instruction : instructor
Qualification	controller : radar
Experience	controller radar : 15 controller time certified in position1 : 15
ASRS Report	578270
Person 2
Affiliation	government : faa
Function	controller : approach
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment : conflict alert other controllera
Resolutory Action	controller : issued new clearance
Consequence	faa : investigated
Miss Distance	horizontal : 15000 vertical : 500
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was providing on-the-job instruction to an air traffic controller in training. We work in the kennedy area of the ny TRACON. We were training on combined radar position. I informed the developmental controller that his sequencing plan for the final into jfk airport was not going to work. Immediately following my comments the developmental controller issued additional instructions to an aircraft which compounded the situation. I attempted to rectify the situation by taking over the frequency and issuing new control instructions, but by the time I did this, it was too late and I lost standard separation.

Original NASA ASRS Text

Title: N90 CTLR PROVIDING OJT WAS LATE IN TAKING CTL OF THE POS AND LOST SEPARATION.

Narrative: I WAS PROVIDING ON-THE-JOB INSTRUCTION TO AN AIR TFC CTLR IN TRAINING. WE WORK IN THE KENNEDY AREA OF THE NY TRACON. WE WERE TRAINING ON COMBINED RADAR POS. I INFORMED THE DEVELOPMENTAL CTLR THAT HIS SEQUENCING PLAN FOR THE FINAL INTO JFK ARPT WAS NOT GOING TO WORK. IMMEDIATELY FOLLOWING MY COMMENTS THE DEVELOPMENTAL CTLR ISSUED ADDITIONAL INSTRUCTIONS TO AN ACFT WHICH COMPOUNDED THE SIT. I ATTEMPTED TO RECTIFY THE SIT BY TAKING OVER THE FREQ AND ISSUING NEW CTL INSTRUCTIONS, BUT BY THE TIME I DID THIS, IT WAS TOO LATE AND I LOST STANDARD 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.