ACFT CROSSES ACTIVE RWY TWICE WITHOUT CLRNC. RWY INCURSION.

Narrative

AFTER LNDG AT WHITE PLAINS; NY; RWY 34/16 AND CLRING THE ACTIVE TXWY H; GND CTL ASKED TAXI DEST. AFTER ANSWERING GA TIE-DOWN; GND CTL INSTRUCTED TO TAXI BEHIND A GULFSTREAM TAXIING S ON TXWY A AND CONTACT WESTCHESTER UNICOM 122.95 FOR DIRECTIONS. AFTER THE GULFSTREAM PASSED; I TURNED R ONTO TXWY A AND FOLLOWED. DURING THIS TIME THE GULFSTREAM AND MYSELF TAXIED ACROSS RWY 11/29. AFTER REALIZING THE GULFSTREAM WAS TAXIING TO THE ACTIVE; I STOPPED AT THE EASTERN MOST POINT OF TXWY K AND AGAIN ASKED UNICOM FOR DIRECTIONS FOR THE GA TIE-DOWN. I WAS INSTRUCTED TO TAXI BACK DOWN TXWY A SO THEY COULD VISUALLY GUIDE ME TO THE TIE-DOWN AREA. AGAIN I CROSSED RWY 11/29. I PARKED AND WAS TOLD BY THE UNICOM ATTENDANT THAT GND CTL STATED THAT I HAD NO CLRNC TO CROSS RWY 11/29. IN THE WHITE PLAINS NOTAMS; RWY 11/29 WAS RPTED CLOSED. AT THIS TIME WHITE PLAINS CTL HAS NOT CONTACTED ME DIRECTLY. THIS EPISODE MIGHT HAVE BEEN AVERTED IF THE GND CTLR HAD INSTRUCTED ME TO TURN L AFTER THE GULFSTREAM HAD PASSED; RESULTING IN TAXIING THE RIGHT WAY INITIALLY AND AVOIDING RWY 11/29 ALTOGETHER.