CL65 FLT CREW CROSSES THE RWY HOLD SHORT LINE AT PNS.

Narrative

I WAS A FO ON A PART 121 FLT DEPARTING PNS. WE TAXIED SINGLE ENG TO RWY 35; STARTED THE OTHER ENG AND ACCOMPLISHED REMAINING CHKLISTS. AT THE RWY 35 HOLD SHORT LINE; I MADE THE NORMAL PA ANNOUNCEMENT TO THE PAX AND ADVISED THE FLT ATTENDANT TO BE SEATED. DURING MY PA; THE CAPT HEARD TWR CLR US INTO POS AND HOLD. HE ACKNOWLEDGED THE RADIO CALL AND TAXIED FORWARD. JUST AFTER XING THE HOLD SHORT LINE; WE HEARD THE TWR CLR A LIGHT TWIN ON THE OPPOSITE SIDE OF THE RWY FOR AN INTXN TKOF. WE THEN STOPPED. I AM NOT SURE OF THE SEQUENCE; BUT THE TWR CLRED AN ACFT TURNING FINAL TO LAND AND TOLD US TO HOLD SHORT OF THE RWY. SOMETHING WAS DEFINITELY WRONG WITH THIS PICTURE! OUR NOSE WAS CLOSE TO THE RWY EDGE; WITH ANOTHER ACFT CLRED TO LAND; AND OUR LAST CLRNC WAS TO HOLD SHORT OF THE RWY. I ADVISED THE TWR THAT WE WERE PAST THE HOLD SHORT LINE; THEN TWR CLRED US TO TAXI DOWN THE RWY AND TAKE THE FIRST TURN-OFF. WHEN THE APT ASKED THE TWR IF WE HAD CAUSED THE PROB; THE RESPONSE WAS SOMETHING LIKE 'NO; YOU GUYS ARE ALL RIGHT.' EVIDENTLY THE TWR CTLR MADE A MISTAKE OR WE MISUNDERSTOOD THE CLRNC. THE OUTCOME WAS GOOD IN THIS SIT BECAUSE THE CONFLICT WAS RESOLVED IN A TIMELY MANNER BY THE TWR AND THE CREW. CONTRIBUTING FACTORS: THE LCL CTLR WAS BUSY WITH ARRIVING/DEPARTING TFC AND A TRANSITIONING FLT OF HELIS. THE CAPT NOTED AFTERWARDS THAT HE WAS HEARING MY PA IN HIS HEADSET WHILE HE WAS MONITORING/RESPONDING TO THE TWR. THAT MAY HAVE INTERFERED WITH RECEIVING THE CLRNC. IF THE CLRNC WAS MISUNDERSTOOD; THE TWR DID NOT CORRECT THE CAPT WHEN HE READ BACK 'CLRED INTO POS AND HOLD.' CORRECTIVE ACTION: CREW SHOULD ENSURE BOTH ARE READY TO MONITOR CLRNC OR; IF NOT; ASK TO HOLD SHORT FOR WHATEVER TIME IS NECESSARY. I BRIEFED THE CAPT ON DESELECTING THE INTERCOM SWITCH DURING THE RA SO HE WOULD NOT HAVE THAT INTERFERENCE IN HIS HEADSET. ATC SHOULD VERIFY CLRNC READBACKS.