NMAC. IN FOREIGN AIRSPACE; ARGENTINA; APPARENT CTLR ERROR CAUSED RPTR ACFT TO RECEIVE A TCASII RA WHICH WAS FOLLOWED AGGRESSIVELY. RPTR CAPT ESTIMATES MISS AS 100- 100 FT. WHEN ASKED; CTLR ACKNOWLEDGED THE OTHER TFC. RPTR SAYS IT'S HIS SECOND TIME IN THE BUENOS AIRES AIRSPACE THAT AN NMAC HAS OCCURRED. B747.

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A NEAR MISS OCCURRED DURING DSCNT TO FL150; ON ATC FREQ 124.9 AFTER GUA VOR. A TCASII TA; FOLLOWED BY A RESOLUTION COMMAND TO CLB GREATER THAN 2000 FPM AT APPROX FL170; TIME XA13Z. FULL PWR WAS APPLIED. THE FO WAS FLYING BUT THE CAPT APPLIED FULL PWR AND ASSISTED IN A MORE AGGRESSIVE RATE OF ACFT NOSE UP PITCH ATTITUDE CHANGE TO CLB AND TURN R. AT THE CLOSEST POINT THE TCASII INDICATED AN ALT DIFFERENCE OF 100 FT; EZEIZA ATC WAS IMMEDIATELY ADVISED AND ACKNOWLEDGED THE PRESENCE OF THE OTHER ACFT. WE NEVER SAW THE OTHER ACFT. THE PAX WERE ADVISED OF THE NEAR MISS. AFTER THE MISS; WE COMMENCED A DSCNT TO 5000 FT AND COMPLETED THE RAGON 1B STAR AND A #4 ILS TO RWY 35 AT EZE. COMPANY RPTS WERE FILED. THE #2 INS FAILED DURING THE AGRESSIVE PULLUP. A DEBRIEFING WITH FLT ATTENDANTS OCCURRED TO EXPLAIN THE EVENT. THE FO WAS REMINDED OF THE NECESSITY TO SHIFT FROM THE 'SMOOTH AIRLINE PLT' MODE TO A MORE AGGRESSIVE CTL INPUT TO AVOID A COLLISION. THIS IS THE SECOND NEAR MISS I HAVE EXPERIENCED IN THE EZE AREA (SEE RPT ATTACHED DATED FEB/XX/96). I THANK GOD FOR THE INCLUSION OF GPWS AND TCASII IN ACR ACFT. TCASII HAS NOW SAVED MY LIFE AND THOSE OF PAX AND CREW 2 TIMES IN 4 MONTHS. I REMAIN CONVINCED THAT MINOR ALTERATIONS IN THE HORIZ FLT TRACK WOULD REDUCE THE NUMBERS AND SEVERITY OF RESPONSIVE ACTION; AND PRAY EFFORT WILL CONTINUE TO DEVELOP HORIZ ESCAPE MANEUVERING.