NORDO ACFT ARRIVES AT RDU. RECEIVES OK BUT UNABLE TO ESTABLISH RADIO CONTACT. AFTER WAITING FOR GND CTLR RESPONSE FINALLY TAXIES ACFT WITHOUT AUTH.

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I DEPARTED ARPT IGX AT APPROX XX45 LCL ON JAN/THU/97; TO DELIVER AIRPLANE TO AVIONICS SHOP AT RDU (14 NM E OF IGX). THE INTERCOM IN ACFT WAS INOP AND SCHEDULED FOR REPAIR THE NEXT MORNING; THE RADIO WAS FUNCTIONAL AT TIME OF DEP. A SECOND ACFT (CHASE PLANE) FOLLOWED IN ORDER TO BRING ME BACK TO IGX AFTER DELIVERY. AFTER DEPARTING THE TFC PATTERN AT IGX; I MADE A RADIO CALL TO RDU APCH. I WAS GIVEN A HEADING; ALT AND XPONDER CODE AND WAS TOLD TO EXPECT RWY 23R. CHASE PLANE CONTACTED APCH AND WAS ISSUED SAME INSTRUCTIONS. MY XMITTER FAILED SEVERAL MINS LATER; I WAS STILL ABLE TO HEAR THE CTLR AND I CONTINUED TO RESPOND TO HIS VECTORS. CHASE PLANE ADVISED APCH THAT I WAS PROBABLY NORDO. APCH RESPONDED BY ASKING ME TO IDENT IF I COULD HEAR HIM. I DID SO AND WAS GIVEN FURTHER VECTORS; THEN HANDED OFF TO ANOTHER APCH FREQ. THIS CTLR ALSO ISSUED VECTORS AND VERIFIED MY RECEPTION OF SAME VIA MY IDENT SIGNAL. DURING THIS PHASE; THE CHASE PLANE WAS VECTORED ONTO FINAL FOR RWY 23R AND WAS THEN HANDED OFF TO THE TWR. I WAS THEN VECTORED ONTO FINAL BEHIND THE CHASE PLANE AND WAS HANDED OFF TO THE TWR. THE TWR DID NOT ASK ME TO IDENT OR ACKNOWLEDGE ME IN ANY OTHER WAY. THE CHASE PLANE PLT REMINDED TWR THAT I WAS NORDO AND ASKED WHETHER I HAD BEEN CLRED TO LAND. TWR RESPONDED BY CLRING ME TO LAND. CHASE PLANE LANDED FIRST AND WAS HANDED OFF TO GND CTL. I LANDED SEVERAL MINS LATER AND TAXIED CLR OF THE RWY AND HELD SHORT OF FIRST PARALLEL TXWY. I WAITED THERE FOR ABOUT 1 MIN BUT RECEIVED NO FURTHER INSTRUCTIONS FROM TWR CTLR WHO WAS MODERATELY BUSY COORDINATING ARRS AND DEPS. I BECAME CONCERNED ABOUT BEING IN THE WAY OF SUBSEQUENT ARRS. AFTER CHKING FOR TFC; I TAXIED ACROSS THE FIRST PARALLEL TXWY AND HELD SHORT OF THE SECOND PARALLEL TXWY WHICH IS GENERALLY USED FOR SMALL ACFT. AFTER HOLDING THERE FOR 2-3 MINS AND CONTINUING TO MONITOR TWR FREQ; I SWITCHED TO GND CTL FREQ. AFTER CHKING FOR TFC; I TURNED R ONTO THE PARALLEL AND PROCEEDED TOWARD MY DEST. AT THIS TIME; A TWIN TURBOPROP HOLDING SHORT OF THIS TXWY ABOUT 150 YARDS AHEAD OF ME WAS ISSUED INSTRUCTIONS TO TAXI IN MY DIRECTION. THE PLT OF THE TWIN RPTED MY PRESENCE BUT DID NOT BEGIN TAXIING TOWARD ME. AT THIS POINT; THE GND CTLR REALIZED THAT I WAS THE NORDO ACFT AND ASKED ME TO TURN MY LIGHTS OFF; THEN ON; IF I HEARD HIM. I DID SO AND WAS CLRED TO TAXI TO THE RAMP. IN RETROSPECT; ALTHOUGH THE TWR CTLR DID NOT HANDLE THE SIT PROPERLY; I WAS WRONG TO TAXI WITHOUT RECEIVING INSTRUCTIONS TO DO SO. I SHOULD HAVE REMAINED CLR OF THE RWY; BUT SHORT OF THE FIRST PARALLEL TXWY UNTIL BEING TOLD TO CONTINUE.