CPR X NON ADHERENCE TO ATC CLRNC CROSSED ACTIVE RWY. PLTDEV. RWY INCURSION.

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CPR X RECEIVED ATIS AND OUR CLRNC. CPR X CALLED GND FOR TAXI. OUR POS WAS ON RAMP LOCATED AT THE NE END OF TXWY J WHICH CROSSES RWY 32 AT ABOUT 2000 FT FROM THE DEP END. WE WERE AWARE THAT THE ACTIVE WOULD BE RWY 32; 'GSO GND CPR X; TAXI WITH CLRNC.' GND: 'CPR X TAXI RWY 32 VIA TXWY J.' COPLT READ BACK SAME. AS WE PROCEEDED OUT TXWY J TO CROSS RWY 32 AND WERE 500 FT FROM THE INTXN; I NOTICED AN SMT FLY BY ON TKOF AND REMARKED TO THE COPLT VIA INTERCOM 'THAT'S CUTTING IT PRETTY CLOSE; I WONDER IF THE TWR KNEW GND HAS CLRED US TO CROSS.' COPLT REPLIED 'I DON'T KNOW; I THINK WE ARE SUPPOSED TO HOLD SHORT OF RWY 32.' I SAID; 'NO; HE HAS CLRED US TO RWY 32 BUT HE ONLY MENTIONED TXWY J.' COPLT SAYS; 'HE DIDN'T SAY TXWY A.' (TXWY A IS THE PARALLEL ON THE OTHER SIDE OF RWY 32 FROM OUR POS.) I SAID 'WELL; HE NEVER INSTRUCTED US TO HOLD SHORT OF RWY 32 HERE AND WE DIDN'T READ IT BACK; SO IF NOBODY'S COMING I'M GOING TO CROSS.' I LOOKED UP AND DOWN THE RWY AND CONTINUED ACROSS. COPLT SAID; 'I'LL CALL TO MAKE SURE.' I SAID; 'WAIT AND SEE WHAT HE SAYS; NOBODY IS LNDG OR TAKING OFF.' SURE ENOUGH; GND CALLED; 'CPR X YOU ARE XING THE ACTIVE; I DIDN'T CLR YOU TO CROSS.' I SAID; 'ROGER; I WOULD HAVE EXPECTED YOU TO SAY 'HOLD SHORT OF RWY 32. AND HAVE US READ IT BACK.' GND SAID 'NO CPR X YOU WERE NOT CLRED TO CROSS RWY 32.' I SAID TO THE COPLT; 'I'M CALLING BACK HERE AS SOON AS WE GET TO MACON.' GND SAID; 'CPR X YOU ARE CLRED TO TAXI TO RWY 32 VIA TXWY A.