A TWIN JET TRANSPORT HAD A CRITICAL CONFLICT WITH ANOTHER AIRCRAFT WHILE ON APP TO TJSJ.

Narrative

LNDG AT TJSJ. APPROX 17 MI NW DSNDING THROUGH 3000 FT FOR 2200 FT ON A 140 DEG HDG WITH INSTRUCTIONS TO INTERCEPT THE LOC. RECEIVED A TFC CALLOUT FOR VFR TFC AT 12:30 - 1 O'CLOCK POS AND 3 MI SHOWING 1700 FT. WE BOTH LOOKED DOWN AT THE TCAS AND SAW THE TFC. JUST AS THE FO SAID 'HE'S CLBING;' THE CONTACT TURNED AMBER AND WE RECEIVED A 'TFC; TFC.' ALMOST IMMEDIATELY IT TURNED RED AND WE RECEIVED 'MONITOR VERT SPD' FOLLOWED ABOUT 3 SECONDS LATER WITH A 'CLB; CLB' AND A COMMAND FOR A VERT SPD OF 2500 FPM. THE FO DISCONNECTED THE AUTOTHROTTLES AND AUTOPLT AND APPLIED FULL PWR AND STARTED A PULL-UP. THE TFC WAS NOW INSIDE 1 MI AND WITHIN 300 FT. THE FO THEN PULLED HARDER (APPROX 2 G'S) AND STARTED A L-HAND TURN AT APPROX 35 DEGS OF BANK. THE CLOSEST POINT OF APCH APPEARED TO BE LESS THAN 1/2 MI (DUE TO THE TURN) AND 200 FT BELOW. NEITHER OF US SAW THE ACFT AS WE WERE FORCED TO TURN AWAY AS WELL AS CLB AND IT WAS UNDER OUR NOSE. IN MY OPINION; HAD THE FO NOT MANEUVERED THE ACFT AS AGGRESSIVELY AS HE DID; AND ESPECIALLY TURNED AWAY; WE WOULD HAVE EITHER HIT OR HAVE COME EXCEEDINGLY CLOSE TO HITTING THIS ACFT. THE CLB TOOK US TO 4000 FT AND WE HAD TURNED L 60 DEGS WHEN WE HEARD 'CLR OF CONFLICT.' AFTER INFORMING APCH OF THE RA; WE WERE HANDED OFF TO TWR FOR A NORMAL VISUAL STRAIGHT-IN TO RWY 10. AFTER LNDG; I CONTACTED THE APCH CTL AND INITIATED A NEAR MISS RPT. NO INJURIES WERE RPTED.