Narrative:

We were on radar vectors for an ILS approach to runway 6 at islip, ny at 2000 ft MSL. We had an operating TCASII (collision avoidance) on board the aircraft. There were numerous traffic showing on the TCASII screen. We received an oral traffic advisory in cockpit, saw aircraft at our altitude on screen at 12 O'clock. Approach control then advised us of traffic and gave us a 90 degree turn to the left. We started immediate left turn and then received resolution advisory in cockpit to descend, which we did, to 1500 ft MSL. Approach control said traffic was clear and we climbed back up to 2000 ft. Approximately 4 min later we again saw numerous traffic approaching on scope and received a traffic advisory of aircraft at our altitude at 12 O'clock. We did not receive any advisory from approach control, then received resolution advisory in cockpit to climb. We climbed and turned left, saw an small aircraft pass off our right wing approximately 1/2 mi away. We advised ATC of our climb, received heading for ILS, and ILS and landing was uneventful. This was my first RA encounter with TCASII, and it made a believer of me. I have to ask this question: is there a safer way to funnel commercial jet traffic into islip, ny? New york approach does a good job in a very congested area (jfk, etc) but cannot advise of every small airplane in the islip (long island in general) area, and there are many of them. Can we prohibit non-IFR aircraft from jet approach corridors? I suggest we had better, soon.

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Original NASA ASRS Text

Title: HDG TRACK AND ALT DEV DURING TCASII RA'S. POTENTIAL CONFLICT WITH NUMEROUS VFR ACFT.

Narrative: WE WERE ON RADAR VECTORS FOR AN ILS APCH TO RWY 6 AT ISLIP, NY AT 2000 FT MSL. WE HAD AN OPERATING TCASII (COLLISION AVOIDANCE) ON BOARD THE ACFT. THERE WERE NUMEROUS TFC SHOWING ON THE TCASII SCREEN. WE RECEIVED AN ORAL TFC ADVISORY IN COCKPIT, SAW ACFT AT OUR ALT ON SCREEN AT 12 O'CLOCK. APCH CTL THEN ADVISED US OF TFC AND GAVE US A 90 DEG TURN TO THE L. WE STARTED IMMEDIATE L TURN AND THEN RECEIVED RESOLUTION ADVISORY IN COCKPIT TO DSND, WHICH WE DID, TO 1500 FT MSL. APCH CTL SAID TFC WAS CLR AND WE CLBED BACK UP TO 2000 FT. APPROX 4 MIN LATER WE AGAIN SAW NUMEROUS TFC APCHING ON SCOPE AND RECEIVED A TFC ADVISORY OF ACFT AT OUR ALT AT 12 O'CLOCK. WE DID NOT RECEIVE ANY ADVISORY FROM APCH CTL, THEN RECEIVED RESOLUTION ADVISORY IN COCKPIT TO CLB. WE CLBED AND TURNED L, SAW AN SMA PASS OFF OUR R WING APPROX 1/2 MI AWAY. WE ADVISED ATC OF OUR CLB, RECEIVED HDG FOR ILS, AND ILS AND LNDG WAS UNEVENTFUL. THIS WAS MY FIRST RA ENCOUNTER WITH TCASII, AND IT MADE A BELIEVER OF ME. I HAVE TO ASK THIS QUESTION: IS THERE A SAFER WAY TO FUNNEL COMMERCIAL JET TFC INTO ISLIP, NY? NEW YORK APCH DOES A GOOD JOB IN A VERY CONGESTED AREA (JFK, ETC) BUT CANNOT ADVISE OF EVERY SMALL AIRPLANE IN THE ISLIP (LONG ISLAND IN GENERAL) AREA, AND THERE ARE MANY OF THEM. CAN WE PROHIBIT NON-IFR ACFT FROM JET APCH CORRIDORS? I SUGGEST WE HAD BETTER, SOON.

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.