ACR MLG CREW EXTOL THE VIRTUES AND BENEFITS OF THE TCASII SYS IN EVASIVE ACTION CLB TECHNIQUES IN XING CLBING TFC SITS. POTENTIAL CONFLICTS.

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2 INCIDENTS ARE RELATED HERE SINCE THEY OCCURRED WITHIN 10 MINS OF EACH OTHER; BUT ARE STILL SEPARATE AND DISTINCT OCCURRENCES. WE HAD DSNDED FROM CRUISE ALT TO 16000 FT FOR OUR ARR TO BDL AND WERE INBOUND TO THE MAD VOR. (NORMAL XING AT MAD IS 11000 FT; 250 KTS.) JUST AS I COMMENTED TO THE FO; WHO WAS THE PF; THAT WE NEEDED TO GET LOWER; ZBW CLRED US TO CROSS MAD AT 11000 AT 250 KTS. WE STARTED DOWN WHEN THE TCASII GAVE US A TA FOR 1 O'CLOCK. THE SCREEN SHOWED TFC AT 1 O'CLOCK CLBING. I THOUGHT IT WOULD LEVEL OUT; THEN WE GOT AN RA COMMANDING A CLB AT 1500 FPM. THE FO COMPLIED WITH THE COMMAND. I ALERTED ZBW WHO REPLIED THAT THE TFC JUST POPPED UP AND GAVE US A R TURN. IN THE TURN; BOTH THE FO AND I WERE ABLE TO SEE A NAVY SPC ACFT IN OUR 4-5 O'CLOCK POS. OTHER ACFT INBOUND TO MAD ALSO RPTED THE SPC AS CONTINUING TO CLB ON THAT ARR PATH IN THE OPPOSITE DIRECTION. ABOUT 10 MINS LATER; AFTER CTR VECTORING AND HDOF TO BDL APCH; WE WERE NW OF MAD AT 11000 FT; BDL APCH RPTED TFC AT 9-10 O'CLOCK WHICH WE ACKNOWLEDGED VISUALLY. TFC APPEARED PARALLEL TO OUR COURSE AND ABOUT 1000-1500 BELOW. WE WERE CLRED TO 10000 AND STARTED DSCNT WHEN THE RA WENT OFF AGAIN COMMANDING A 1500 FPM CLB. THE FO AGAIN PULLED UP. I NOTICED THE TFC HAD CHANGED COURSE 90 DEGS AND NOW WAS XING OUR FLT PATH ABOUT 400 FT BELOW. I NOTIFIED BDL APCH OF OUR ACTION. VECTORS WERE RECEIVED AND WE LANDED A SHORT TIME LATER WITHOUT FURTHER INCIDENT. ETERNAL VIGILANCE IS THE KEYWORD AND THANK GOD FOR TCASII. WHEN IT GOES OFF -- OBEY IT. QUESTION IT LATER IF YOU WILL; BUT DO IT NOW!