Narrative:

Bwi -- cleared to taxi for takeoff runway 28. I made a wrong turn and crossed runway 28 without clearance. There was no traffic conflict with other aircraft. Ground control told us to turn and cleared us back across runway 28. I looked both ways before crossing and saw no traffic, but thought I was crossing runway 4/22. What most concerned me about my error was the fact that I thought I was being cautious. I had the airport diagram out and in front of me. The first officer had the opc finished, but I said I would look at the data after taxiing past the intxns. The first officer was new (third trip) and not familiar with bwi. I thought I was being careful, but still made this mistake. We were not running checklists or looking at opc and there were no other distractions. I cannot define any factors that contributed to my error except my mental disorientation while taxiing out. Supplemental information from acn 533506: flight was cleared to taxi to runway 28 for departure. We proceeded from gate X to taxiway east. Proceeded across runway 10/28 and was queried by ground controller. Ground controller then cleared us to taxiway D and entrance onto runway 4 to taxi back across runway 10/28. We taxied runway 28 and departed. We landed on runway 33L and traffic was landing on runway 33L as we taxied. Captain may have confused landing runway with departure runway? If I had been more familiar, I would have questioned the taxi route the captain was taking. Lesson learned: as a new first officer, and from now on, I will be more diligent in monitoring taxi route. At unfamiliar airports, I will ask captain to confirm taxi route.

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Original NASA ASRS Text

Title: A B737 CREW TAXIING FOR TKOF AT BWI, BECAME DISORIENTED AND TAXIED ACROSS AN ACTIVE RWY WITHOUT A CLRNC.

Narrative: BWI -- CLRED TO TAXI FOR TKOF RWY 28. I MADE A WRONG TURN AND CROSSED RWY 28 WITHOUT CLRNC. THERE WAS NO TFC CONFLICT WITH OTHER ACFT. GND CTL TOLD US TO TURN AND CLRED US BACK ACROSS RWY 28. I LOOKED BOTH WAYS BEFORE XING AND SAW NO TFC, BUT THOUGHT I WAS XING RWY 4/22. WHAT MOST CONCERNED ME ABOUT MY ERROR WAS THE FACT THAT I THOUGHT I WAS BEING CAUTIOUS. I HAD THE ARPT DIAGRAM OUT AND IN FRONT OF ME. THE FO HAD THE OPC FINISHED, BUT I SAID I WOULD LOOK AT THE DATA AFTER TAXIING PAST THE INTXNS. THE FO WAS NEW (THIRD TRIP) AND NOT FAMILIAR WITH BWI. I THOUGHT I WAS BEING CAREFUL, BUT STILL MADE THIS MISTAKE. WE WERE NOT RUNNING CHKLISTS OR LOOKING AT OPC AND THERE WERE NO OTHER DISTRACTIONS. I CANNOT DEFINE ANY FACTORS THAT CONTRIBUTED TO MY ERROR EXCEPT MY MENTAL DISORIENTATION WHILE TAXIING OUT. SUPPLEMENTAL INFO FROM ACN 533506: FLT WAS CLRED TO TAXI TO RWY 28 FOR DEP. WE PROCEEDED FROM GATE X TO TXWY E. PROCEEDED ACROSS RWY 10/28 AND WAS QUERIED BY GND CTLR. GND CTLR THEN CLRED US TO TXWY D AND ENTRANCE ONTO RWY 4 TO TAXI BACK ACROSS RWY 10/28. WE TAXIED RWY 28 AND DEPARTED. WE LANDED ON RWY 33L AND TFC WAS LNDG ON RWY 33L AS WE TAXIED. CAPT MAY HAVE CONFUSED LNDG RWY WITH DEP RWY? IF I HAD BEEN MORE FAMILIAR, I WOULD HAVE QUESTIONED THE TAXI RTE THE CAPT WAS TAKING. LESSON LEARNED: AS A NEW FO, AND FROM NOW ON, I WILL BE MORE DILIGENT IN MONITORING TAXI RTE. AT UNFAMILIAR ARPTS, I WILL ASK CAPT TO CONFIRM TAXI RTE.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.