NMAC BTWN AN AS350 HELI AND A DEHAVILLAND DASH 8 AT 1000 FT VFR OFF THE COAST OF THE ISLAND OF MAUI; HI. THE HELI DSNDED AND TURNED TO SIGHT THE DASH 8 WHICH WAS RPTED BY UNICOM TO BE ABOVE AND BEHIND RPTR.

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UPON LEAVING AN AREA KNOWN AS KAMALO; I RADIOED KAPALUA UNICOM WITH MY INTENTIONS TO CROSS FROM KAMALO TO BLACKROCK AT 1000 FT. I WAS AT THE TIME FLYING AN A5350B2 HELI AND THE WX WAS VMC; WITH UNLIMITED CEILING; AND VIRTUALLY UNRESTR VISIBILITY. APPROX 1/2 TO 1 MI OFFSHORE OF BLACKROCK; I WAS INFORMED BY KAPALUA UNICOM THAT THERE WAS A DASH 8 BEHIND ME. I INITIALLY BANKED THE ACFT TO THE L AND WHEN I COULD NOT ESTABLISH A VISUAL WITH THE DASH 8 I BANKED THE HELI BACK TO THE R; BACK TO MY ORIGINAL INTENDED COURSE WHICH WAS TO BE 1/2 MI OFFSHORE AND SBOUND TOWARDS LAHAINA. AT THIS TIME; I SAW THE DASH 8 APPROX 300 FT BEHIND ME AND 300 FT ABOVE ME. THE PLT OF THE DASH 8 WAS SAYING 'GET DOWN; GO DOWN' ON THE RADIO; WHICH I DID. I CONTINUED ON TOWARDS LAHAINA AND HEARD THE PLT OF THE DASH 8 SAY 'THAT WAS CLOSE' AND THEN ASKED KAPALUA 'WHAT WAS THE CALL SIGN OF THAT HELI?' I BELIEVE A POSSIBLE CONTRIBUTING FACTOR TO THIS INCIDENT MAY HAVE BEEN MISINFO GIVEN TO THE DASH 8 PLT. I BELIEVE HE MAY HAVE BEEN TOLD THAT A HELI WAS XING KAMALU TO LAHAINA WHEN IN FACT I HAD SAID KAMALO TO BLACKROCK. ALSO; OTHER XMISSIONS ON THE FREQ KEPT ME FROM UPDATING MY POS AND INTENTIONS. AFTER THE INCIDENT; SOMETHING WAS SAID BY KAPALUA REQUESTING THAT IF 360 DEG TURNS WERE TO BE PERFORMED; THAT I NEED TO LET THEM KNOW. NO 360 DEG TURNS WERE PERFORMED. ONLY THE INITIAL L BANK TO TRY TO LOCATE THE OVERTAKING ACFT.