B767-300 FLC HAS TCASII RA DURING APCH TO MYNN.

Narrative

THE CAPT WAS PLT FLYING ON FLT ABC FROM KLGA TO MYNN. DSNDING INTO NASSAU; WE RECEIVED A TCASII RA REQUIRING A CLB. ATC (NASSAU APCH) HAD ADVISED THE OTHER ACFT INVOLVED (TYPE UNKNOWN) OF OUR POS AND HE REPLIED THAT HE HAD VISUAL CONTACT WITH US. ATC THEN INSTRUCTED THE OTHER ACR TO MAINTAIN VISUAL SEPARATION WITH US. ATC THEN ADVISED US OF THE TFC AND THAT HE WOULD MAINTAIN VISUAL SEPERATION WITH US. NEIHER THE CAPT NOR ONE EVER HAD VISUAL CONTACT WITH THE OTHER ACFT. A FEW MOMENTS LATER; WHILE DSNDING THROUGH APPROX 5000 FT MSL; WE RECEIVED THE RA. THE OTHER ACFT (WHO WAS SUPPOSED TO BE MAINTAINING VISUAL SEPARATION WITH US) PASSED BELOW AND TO THE L OF US. MINIMUM VERT SEPARATION WAS ABOUT 500 FT AND HORIZ WITHIN 1/2 MI. THE TCASII RA INSTRUCTED A CLB AT A MINIMUM RATE OF ABOUT 2000 FPM. THE CAPT (PF) DISENGAGED THE AUTOPLT AND CLBED THE ACFT TO COMPLY WITH THE TCASII RA. AT ABOUT 6500 FT THE RA CEASED AND THE PF REDUCED CLB TO LEVEL AND BEGAN DSCNT. RA OCCURRED AGAIN AS THE OTHER ACFT PASSED BELOW US. I RPTED THE RA AND THE FACT THAT WE WERE CLBING TO ATC AND THE CTLR ADVISED THAT THE OTHER ACFT WAS MAINTAINING VISUAL SEPARATION FROM US. AFTER EVENT A NORMAL DSCNT; APCH AND LANDING WERE MADE AT MYNN. PAX WERE ADVISED OVER PA DESCRIBING NEED FOR CLIMB.