MULTIPLE RWY OP PARALLEL RWYS. ACR X NON ADHERENCE TO ATC CLRNC DRIFTED INTO PARALLEL RWY APCH PATH RECEIVED TCASII RA. PLTDEV.

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ACR X ON THE BIG SUR ARR TO SAN FRANCISCO (SFO) AT MENLO INTXN TURNING TO THE INTERCEPT HDG OFF OAKLAND VOR LISTENING TO APCH CTL FOR SFO. APCH INSTRUCTS US TO INTERCEPT THE 28L LOC AND SLOW DOWN TO 180 KTS; THEN DSND TO 1900 FT. MY COPLT IS FLYING AND COMPLIES WITH THE CLRNC. WHILE ON THE 310 DEG INTERCEPT HDG TFC IS ISSUED TO US THUS; 'ACR X DO YOU SEE AN MLG AT 2 O'CLOCK OVER THE BRIDGE TURNING IN FOR RWY 28R.' I LOOK OUT AND SEE AN MLG WHO IS IN THAT POS HDG FOR US AND COMMENCING A TURN TOWARD RWY 28R OVER THE BRIDGE. I STATE TO SFO THAT WE DO HAVE THE TFC AND HE THEN CLRS US TO MAINTAIN SEPARATION FROM THAT ACFT GIVING US A VISUAL TO RWY 28L. HE THEN STATES; 'CALL THE HIGH SPAN TO SFO TWR; GOOD DAY.' SINCE THIS SPD AND ALT BRINGS US IN FAST AND HIGH FOR A STRAIGHT COURSE AND HE SAID TO RPT THE HIGH SPAN; I TAKE THAT TO MEAN CROSS OVER THE HIGH SPAN OF THE BRIDGE AND INSTRUCT THE FO TO DO JUST THAT. SINCE HE IS NEW TO THIS AIRPLANE I ALSO AM GIVING SUGGESTIONS AS HOW TO CONFIGURE FOR COMPLETION OF THIS APCH. WE HAVE A BRIEF DISCUSSION ABOUT LEAVING THE 28L LOC BUT SINCE I SEE MLG SAFE AHEAD OF US AND WE WERE ASKED TO RPT THE 'HIGH SPAN' I SEE NO REASON WE CAN'T COMPLY WITH FLYING TO AND RPTING OVER THAT PART OF THE BRIDGE TO TWR. THIS WILL ALSO GIVE US THE ROOM WE NEED TO SLOW DOWN AND GO DOWN SO MY FO CAN COMPLY WITH OUR SOP. WHILE SWITCHING TO TWR WE RECEIVE A TCASII ALERT AND MY FO FOLLOWS THE TCASII INSTRUCTIONS AND TURNS BACK TOWARD THE L. I AT THAT TIME DO NOT KNOW WHO THE INTRUDER ACFT IS AND WE DON'T HAVE TIME TO FIND OUT. HOWEVER; AS THIS TAKES PLACE; THE RADIO CHANNELS TO TWR AND WE HEAR ACR Y COMPLAINING TO TWR OF OUR PRESENCE NEAR HIM. OUR TCASII INDICATIONS WERE 800 FT VERT WITH SOME HORIZ DISTANCE TO US. ACR Y CONTINUES TO MONOPOLIZE THE RADIO SO WE ARE UNABLE TO CONFIRM LNDG CLRNC UNTIL WE ARE CLOSE TO RWY 28L. WE COMPLETE THE LNDG AND PROCEED TO THE GATE. I CALL THIS NUMBER AT THE GATE AND LEARN THEN THAT THE OTHER PLT INTENDS TO FILE A NEAR MISS RPT. I CONTACT THE APCH CTL CHIEF TO FIND OUT FROM THEM WHAT HAPPENED. THEY WERE TOO BUSY AND SAID THEY WOULD CALL ME AT THE HOTEL. WHEN THEY DID IT WAS AT THAT TIME THAT I FOUND OUT THEY HAD N FACT ISSUED ACR Y AS OUR TFC AND ASSUMED WE WERE FOLLOWING THIS PLANE TO THE ARPT.