A DORNIER ACR ACFT PERFORMS A GAR WHEN HIS LNDG RWY EXPERIENCES A RWY INCURSION BY A BELL 206B3 HELI LNDG AT GCN; AZ.

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APCHED GRAND CANYON NATIONAL ARPT FROM THE W. ATTEMPTED TO GET THE ATIS BEFORE FLYING OVER THE RANCH; BUT COULD NOT UNDERSTAND IT. THE PERSON THAT RECORDED IT HAD A THICK NEW ENGLAND ACCENT. CALLED THE TWR AT THE RANCH AND TOLD THEM MY POS AND INTENTIONS. THE SAME PERSON THAT MADE THE ATIS RECORDING WAS THE CTLR. ANYWAY; HE CLRED ME INTO THE AIRSPACE AND TOLD ME TO CALL WHEN 1/2 MI OUT. I CALLED AT 1/2 MI OUT; BUT THE CTLR DID NOT HAVE ME IN SIGHT. HE ASKED IF I HAD THE OLD TWR IN SIGHT; TO WHICH I REPLIED 'AFFIRMATIVE.' HE THEN TOLD ME TO FLY N OF THE TWR; THAT I WAS CLRED TO THE TRANSIENT HELIPAD. AS SOON AS I LANDED AT THE HELIPAD; THE CTLR TOLD ME THAT HE HAD NOT CLRED ME TO CROSS THE ACTIVE RWY AND THAT I HAD CUT OFF A DORNIER THAT MADE A GAR. THE DORNIER WAS ON FINAL WHEN I LANDED AT THE HELIPAD. I LET MY 2 PAX OFF; WHICH I HAD PICKED UP EARLIER THAT MORNING AT GRAND CANYON NATIONAL. I WAS EXPECTING THE CTLR TO CALL ME TO THE TWR; BUT HE DIDN'T. I HAD FLOWN INTO GRAND CANYON NATION THAT MORNING WITH NO PROBS WITH A DIFFERENT CTLR IN THE TWR. THE CTLR'S THICK NEW ENGLAND ACCENT MADE HIM DIFFICULT TO UNDERSTAND.