AN ACR DC9 FLC CROSS AN ACTIVE RWY WITHOUT AUTH WHEN THEY MISUNDERSTAND THE CLRNC AND FINALLY MISREAD THE ARPT MAP. NO APPARENT CONFLICT.

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DURING FLT FOR MY ACR ON SEP/SAT/97; FROM MILWAUKEE; WI; TO ST LOUIS; MO; I WAS THE FO OF THE DC9 WHICH WAS INVOLVED IN AN INCIDENT. WE WERE CLRED TO TAXI TO RWY 19R TO HOLD SHORT OF RWY 13 VIA TXWY G. I BELIEVED THE CAPT WAS AWARE OF THE HOLD SHORT INSTRUCTION. AS I WAS COMPLETING THE TKOF DATA WITH THE FINAL LOAD NUMBERS (NORMAL FOR TAXI OPS); I LOOKED UP AND NOTICED WE WERE APCHING A RWY AND I SAID TO THE CAPT 'YOU KNOW YOU HAVE TO HOLD SHORT.' THE CAPT STOPPED THE ACFT AND SAID 'I DID NOT HEAR THE HOLD SHORT INSTRUCTION.' THE ACFT CAME TO A STOP A FEW FT PAST THE HOLD SHORT LINE. THE CAPT THEN ASKED 'WHICH RWY?' I INFORMED THE CAPT IT WAS FOR RWY 13. SINCE WE WERE PAST THE HOLD SHORT LINE; WE BOTH LOOKED TO THE SIDES TO MAKE SURE THE RWY WAS CLR AND IT WAS. THE CAPT ASKED WHICH RWY (SINCE THERE ARE 2 RWYS WHICH YOU MUST CROSS TO GET TO RWY 19R ON TXWY G FROM THE GATES); WHILE BEING PAST THE HOLD SHORT LINE; IN MY HASTE I LOOKED AT THE RWY DIAGRAM AND NOTED THE NUMBER 13 N OF RWY 7L AND SAID TO THE CAPT 'IT IS THE NEXT ONE.' AS THE ACFT WAS MOVING OVER THE RWY ON TXWY G I LOOKED AT THE ARPT DIAGRAM AGAIN AND REALIZED THAT RWYS 13 AND 7L CROSS PRIOR TO RWY 19R AND THAT RWY 13 WAS THE RWY THAT WE WERE XING. AS I REALIZED THIS; THE GND CTLR INFORMED US THAT WE WERE TO HOLD SHORT OF RWY 13. WE ACKNOWLEDGED THE XMISSION. THE GND CTLR THEN CLRED US TO TAXI TO RWY 19R. I BELIEVE THAT THE FOLLOWING CONTRIBUTED TO THIS INCIDENT: THE DIFFERENCE OF THE 2 PLTS UNDERSTANDING TWO DIFFERENT TAXI CLRNCS AND NOT CONFIRMING THE INSTRUCTIONS DURING THE HIGH WORKLOAD PHASE WITH THE STARTING OF THE ENGS; READING THE AFTER START CHKLIST; MOVING IN CLOSE QUARTERS AT THE GATE; THE INTERPHONE COMS WITH RAMP PERSONNEL AND THE CLRNC WITH GND CTL. THE FO'S DUTY OF FINISHING THE TKOF DATA WORKSHEET WHILE THE ACFT TAXIES WITH ONLY 2 CREW MEMBERS. THE COMPLEXITY OF THE MILWAUKEE ARPT LAYOUT WITH MULTIPLE RWYS XING AT VARIOUS PLACES. SUPPLEMENTAL INFO FROM ACN 381275: WHILE TAXIING TO RWY 19 FOR TKOF; WE WERE GIVEN THE CLRNC TO RWY 19; HOLD SHORT OF RWY 13. I ORIGINALLY MISSED THE HOLD SHORT PORTION AND THE FO REMINDED ME JUST SHORT OF THE RWY 13 AND TXWY INTXN. WHILE HOLDING SHORT OF THE RWY; THE FO SAID THAT RWY 13 WAS THE NEXT RWY ALONG OUR TAXI RTE. (IT WAS RWY 7/25 THAT HE WAS ACTUALLY LOOKING AT; THINKING IT WAS RWY 13/31). WITHOUT CHKING MY CHART; I TAXIED ACROSS RWY 13/31 SINCE I DIDN'T SEE ANY TFC ASSOCIATED WITH THAT RWY. THE GND CTLR INFORMED US THAT WE WERE TO HOLD SHORT OF RWY 13/31. I ACKNOWLEDGED THAT AND SWITCHED TO TWR FREQ. THE TWR CTLR SAID THERE WAS NO CONFLICT. THE FLT CONTINUED TO STL WITH NO FURTHER INCIDENTS.