ACR X TCASII TA RA HAD NMAC WITH VFR LEAR JET IN VFR DSCNT. EVASIVE ACTION TURN DSND. SEE AND AVOID CONCEPT.

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ACR X WAS CLRED DIRECT TO LRP AT 16000 FT. APPROX 20 MI E OF LPP; ZNY (135.75) ADVISED US OF VFR TFC; 12 O'CLOCK AT 12 MI AT 17500 FT. SUN WAS IN FRONT OF OUR ACFT ABOUT 25 DEGS ABOVE THE HORIZON. THE TCASII NEXT PICKED UP AND GAVE A TA AT 12 O'CLOCK; 6 MI AND 700 FT ABOVE US (16700 FT). THE TCASII NEXT GAVE AN RA TO DSND AT 1500 FPM FOR THE ACFT AT 12 O'CLOCK; AND 300 FT AND DSNDING (16300 FT). A DSCNT WAS INITIATED AND A TURN TO THE R BEGUN. THE TCASII GAVE ANOTHER RA TO INCREASE DSCNT FROM THE ACFT AT 12 O'CLOCK AND 200 FT ABOVE AND DSNDING. THE TFC WAS PICKED UP VISUALLY AT ABOUT 1 MI; DSNDING AND PASSING L TO R. I COMMENCED A L TURN AND THE TFC PASSED BY US. I LEVELED OFF AND THEN STARTED A CLB BACK TO 16000 FT AND HAD THE FO NOTIFY ATC. I BELIEVE THE FO HAD ORIGINALLY NOTIFIED ATC OF OUR ORIGINALLY BEGINNING TO DSND. IF THE OTHER ACFT HAD TCASII; THEN OUR RA TO DSND IN LIGHT OF ITS DSNDING APPEARS DUBIOUS. IF THE OTHER ACFT DID NOT HAVE TCASII OR IT WAS NOT WORKING; EITHER OF WHICH IS MORE PROBABLE; THEN ATC'S EARLY NOTIFICATION OF THE TFC AT 12 O'CLOCK; 12 MI; 17500 FT VFR WAS A VALUABLE CONTRIBUTION TO THE SUBSEQUENT EVENT AND OUTCOME. A FURTHER NOTIFICATION BY ATC THAT THE TFC HAD BEGUN A DSCNT FROM THE 12 MI ADVISORY TO OUR TCASII PICKING IT UP AT 6 MI MAY HAVE NEGATED THE NECESSITY OF OUR DSNDING.