HURRY'N UP FLC FINDS THEMSELVES ON A RWY WHEN THEY SHOULDN'T HAVE BEEN. 2 ONE-MAN SHOWS.

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IT WAS OUR FIRST LEG OF A SHIFT. PLANE CAME LATE FROM PREVIOUS SHIFT SO WE WERE LATE AND TRYING TO CATCH UP. CAPT ELECTED TO DO THE PAPERWORK AND TAKE THE CLRNC SO I DID THE PREFLT AND BOARDED THE PAX. DURING THE WT AND BAL CALCULATIONS CAPT DISCOVERED THAT THE WT AND BAL COMPUTER WAS INOP; SO HE HAD TO DO MANUAL WT AND BAL WHICH TOOK MORE TIME AND MADE US FALL MORE BEHIND THE SCHEDULE. WHILE I BRIEFED THE PAX CAPT STARTED THE ENGS AND STARTED THE BEFORE TAXI CHK. WHEN I GOT TO MY STATION WE RAN THE REST OF THE CHKLIST AND CAPT GOT THE TAXI CLRNC. AT THAT POINT MY RADIO SWITCH FOR #1 RADIO WAS OFF SO I DIDN'T HEAR THE TAXI CLRNC. I ASKED WHERE WE WERE GOING AND CAPT SAID RWY 32. WE STARTED TO TAXI AND CAPT CALLED FOR TAXI/BEFORE TKOF CHK. I PROCEEDED ON READING AND DOING THE CHKLIST IN A NORMAL MANNER. ON MIDDLE OF THE FIELD WE WERE TO CROSS A TXWY AND RWY 5-23. I DISCONTINUED THE CHKLIST AND CLRED MY SIDE AND CALLED 'CLR R.' JUST BEFORE WE ENTERED RWY 5-23 CAPT SLAMMED ON BRAKES AND STOPPED THE AIRPLANE. WHEN WE CAME TO A STOP OUR NOSE WAS ABOUT 1-2 FT IN THE RWY. CAPT CALLED GND AND TOLD THEM THAT WE NEED TO CLR THE RWY AND WE GOT A CLRNC TO CROSS THE RWY. LATER CAPT TOLD ME THAT WE WERE TOLD TO HOLD SHORT RWY 5- 23. TWR SUPVR ASKED US TO CALL HIM AND CAPT EXPLAINED HIM THE SIT. NO FURTHER INVESTIGATION WAS DONE BY ATC. CONTRIBUTING FACTORS: WE WERE LATE; TOO BUSY TRYING TO CATCH UP. MANUAL WT AND BAL MADE US MORE LATE I DIDN'T MONITOR TAXI CLRNC. CAPT DIDN'T GIVE ME THE FULL TAXI CLRNC. LUCKILY NO ACCIDENT OR INCIDENT WAS CAUSED BY THIS HUMAN ERROR. SUPPLEMENTAL INFO FROM ACN 296641: I LOOKED TO MY SIDE AND NOTICED AN ACFT ON APPROX 1 1/2-2 MI FINAL. I PROMPTLY APPLIED MAX BRAKING. DEP CTL ADVISED US TO CALL THEM UPON ARR AT NEW ORLEANS WHICH I DID AND TALKED TO THE SUPVR. WHO UNDERSTOOD THAT THE INCIDENT WAS NOT INTENTIONAL AND HE INDICATED THAT HE DID NOT WANT TO VIOLATE US AND REQUESTED MORE VIGILANCE AND CAUTION WHEN RWY 32 AND RWY 23 ARE SIMULTANEOUSLY IN USE.