A BH06; WHICH THE RPTR ASSUMES WAS SVFR; WAS ON A CONVERGING COURSE WITH AN E120 ON A BACK COURSE APCH TO RWY 27R. APCH CTL HAD TURNED THE BH06 OVER TO THE TWR WITHOUT PROVIDING LEGAL SEPARATION FROM THE E120. THE E120 RESPONDED TO HIS TCASII RA AND CLBED TO AVOID THE BH06.

Narrative

A BH06 WAS GIVEN TO THE CTL TWR 5 MI NE ON A SBOUND HDG; CONVERGING WITH AN ACR E120; ON THE BACK COURSE RWY 27R APCH (WBOUND). I ASSUME THAT THE BH06 WAS ON AN SVFR CLRNC SINCE THE FIELD WAS IFR. THE E120 WAS DSNDING OUT OF 900 FT NOT VISIBLE FROM THE TWR. THE BH06 WAS AT 500 FT ALSO NOT VISIBLE FROM THE TWR. NO SEPARATION HAD BEEN EFFECTED BY THE APCH CTLR. THE TWR (LCL CTLR; JUST RECENTLY CERTIFIED) ISSUED TFC SEVERAL TIMES TO BOTH ACFT. THESE TA'S WERE REDUNDANT SINCE THE E120 WAS IN THE CLOUDS. I TOLD THE LCL CTLR HE NEEDED TO TURN THE HELI. THE 2 ACFT WERE ABOUT 2 MI FROM CONVERGING WITH 200 FT VERT. LCL TOLD THE BH06 TO HOLD HIS POS OR TO MAKE A L 360. THE E120 RESPONDED TO A TCASII RESOLUTION AND CLBED. AFTER THE E120 LANDED HE CALLED THE FACILITY TO RPT AN NMAC. AFTER SPEAKING TO THE SUPVR; HE DECIDED NOT TO FILE. I BRIEFED THE SUPVR THAT WE HAD FAILED TO SEPARATE THE 2 ACFT. I DO NOT BELIEVE THAT ANY ACTIONS ARE GOING TO BE TAKEN. PALM BEACH HAS NUMEROUS FPL'S THAT HAVE LITTLE RADAR EXPERIENCE; YET VERY BIG EGOS. THIS INCIDENT; AT A MINIMUM SHOULD BE REVIEWED; AS A BRIEFING ITEM. WE WERE LUCKY; THANKS TO TCASII.