TCASII was evading 2 aircraft, 1 at 4400 ft and the other at 3800 ft.

Attributes
ACN	240570
Time
Date	199305
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : dpk airport : jfk
State Reference	NY
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	arrival star : star enroute airway : n90
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 4000 flight time type : 1100
ASRS Report	240570
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

We were inbound on the PWL1 just passing bridgeport VOR. The TCASII was tracking many targets (up to 6 on the 5 mi scale). The very busy ny approach issued traffic at 4400 ft. We were also looking out for 3800 ft that our TCASII was tracking. We saw neither aircraft. Next thing we know our TCASII issued an RA climb which my first officer started. Next, the TCASII issued an RA descend as I was telling ATC of our altitude change. ATC next informed us our 4400 traffic was 1 mi from us, and we were now descending out of 4400 ft. We were at 4000, our TCASII RA climbed us for 3800 ft traffic, that flew us into the 4400 ft traffic, this then gave us an RA descend. If not for a little luck, there could have been an accident. ATC could route us for a higher (above 10000 ft). It would keep us out of the multiple VFR targets.

Original NASA ASRS Text

Title: TCASII WAS EVADING 2 ACFT, 1 AT 4400 FT AND THE OTHER AT 3800 FT.

Narrative: WE WERE INBOUND ON THE PWL1 JUST PASSING BRIDGEPORT VOR. THE TCASII WAS TRACKING MANY TARGETS (UP TO 6 ON THE 5 MI SCALE). THE VERY BUSY NY APCH ISSUED TFC AT 4400 FT. WE WERE ALSO LOOKING OUT FOR 3800 FT THAT OUR TCASII WAS TRACKING. WE SAW NEITHER ACFT. NEXT THING WE KNOW OUR TCASII ISSUED AN RA CLB WHICH MY FO STARTED. NEXT, THE TCASII ISSUED AN RA DSND AS I WAS TELLING ATC OF OUR ALT CHANGE. ATC NEXT INFORMED US OUR 4400 TFC WAS 1 MI FROM US, AND WE WERE NOW DSNDING OUT OF 4400 FT. WE WERE AT 4000, OUR TCASII RA CLBED US FOR 3800 FT TFC, THAT FLEW US INTO THE 4400 FT TFC, THIS THEN GAVE US AN RA DSND. IF NOT FOR A LITTLE LUCK, THERE COULD HAVE BEEN AN ACCIDENT. ATC COULD RTE US FOR A HIGHER (ABOVE 10000 FT). IT WOULD KEEP US OUT OF THE MULTIPLE VFR TARGETS.

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.