Narrative:

N90 vectors air carrier X H/IL86, for the ILS to runway 31R. Air carrier X checks in and I advise him he's following a widebody transport 5 mi ahead. The widebody transport lands and I instruct him to exit the runway and to taxi on to 'west' taxiway and contact ground. The widebody transport turns and stops, still on runway. I instruct the widebody transport to move away from the runway and to taxi on to the outer and contact ground. I watch until the widebody transport clears the runway. When I looked back at the d-brite, I see that small transport Y, VFR, small transport Y had been vectored right in front of air carrier X with air carrier X going approximately 80-100 KTS faster. No handoff nor coordination was affected on N90's part. I advised air carrier X to continue, and then attempted contact with small transport Y to turn him out, but small transport Y was not on frequency. Cabin attendant coordinator advised N90 that we need to talk to small transport Y and they replied that they weren't talking to him. Small transport Y is now over the approach end of the runway, approximately 900 ft descending, with air carrier X very close behind and low. A go around to air carrier X at this time would have had him climbing into the small transport Y descending causing a midair, a left turn would have air carrier X crash into the controller tower, and a right turn would take him into lga's airspace. I waited until the small transport Y was over the displaced threshold approximately 75 ft on final when I issued the go around to air carrier X with a right turn, coordination with lga was affected. Air carrier X passed off the small transport Y right side at a very close proximity. Small transport Y advised frequency change to tower was issued as he was flaring out over the runway. Resolution, N90 final controller to always have an assistant or coordinator prior to workload becoming overwhelming thereby causing incidents stated.

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Original NASA ASRS Text

Title: ACR X HAD NMAC LTSS FROM SMT Y. EVASIVE ACTION TAKEN. SYS ERROR.

Narrative: N90 VECTORS ACR X H/IL86, FOR THE ILS TO RWY 31R. ACR X CHKS IN AND I ADVISE HIM HE'S FOLLOWING A WDB 5 MI AHEAD. THE WDB LANDS AND I INSTRUCT HIM TO EXIT THE RWY AND TO TAXI ON TO 'W' TXWY AND CONTACT GND. THE WDB TURNS AND STOPS, STILL ON RWY. I INSTRUCT THE WDB TO MOVE AWAY FROM THE RWY AND TO TAXI ON TO THE OUTER AND CONTACT GND. I WATCH UNTIL THE WDB CLRS THE RWY. WHEN I LOOKED BACK AT THE D-BRITE, I SEE THAT SMT Y, VFR, SMT Y HAD BEEN VECTORED RIGHT IN FRONT OF ACR X WITH ACR X GOING APPROX 80-100 KTS FASTER. NO HDOF NOR COORD WAS AFFECTED ON N90'S PART. I ADVISED ACR X TO CONTINUE, AND THEN ATTEMPTED CONTACT WITH SMT Y TO TURN HIM OUT, BUT SMT Y WAS NOT ON FREQ. CAB COORDINATOR ADVISED N90 THAT WE NEED TO TALK TO SMT Y AND THEY REPLIED THAT THEY WEREN'T TALKING TO HIM. SMT Y IS NOW OVER THE APCH END OF THE RWY, APPROX 900 FT DSNDING, WITH ACR X VERY CLOSE BEHIND AND LOW. A GAR TO ACR X AT THIS TIME WOULD HAVE HAD HIM CLBING INTO THE SMT Y DSNDING CAUSING A MIDAIR, A L TURN WOULD HAVE ACR X CRASH INTO THE CTLR TWR, AND A R TURN WOULD TAKE HIM INTO LGA'S AIRSPACE. I WAITED UNTIL THE SMT Y WAS OVER THE DISPLACED THRESHOLD APPROX 75 FT ON FINAL WHEN I ISSUED THE GAR TO ACR X WITH A R TURN, COORD WITH LGA WAS AFFECTED. ACR X PASSED OFF THE SMT Y R SIDE AT A VERY CLOSE PROX. SMT Y ADVISED FREQ CHANGE TO TWR WAS ISSUED AS HE WAS FLARING OUT OVER THE RWY. RESOLUTION, N90 FINAL CTLR TO ALWAYS HAVE AN ASSISTANT OR COORDINATOR PRIOR TO WORKLOAD BECOMING OVERWHELMING THEREBY CAUSING INCIDENTS STATED.

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.