Narrative:

After landing on runway 13R at dfw; we were cleared to cross runway 18R; and hold short of 18L on taxiway wm. I misunderstood the clearance; and thought we had been cleared to cross both 18L and 18R. I verbalized; 'roger; cleared to cross'; and crossed both runways. We had not been cleared to cross runway 18L; and I realized this after we crossed and heard an aircraft abort due to traffic on the runway. I believe that rather than saying; 'cleared to cross'; if I had said; 'cleared to cross both 18L and 18R'; it would have improved our chances of correcting my misunderstanding of the clearance.

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Original NASA ASRS Text

Title: An air carrier crew reported crossing DFW 18R and 18L after being cleared to cross only the right so that a departing aircraft had to abort its takeoff. The First Officer was heads down with a checklist.

Narrative: After landing on Runway 13R at DFW; we were cleared to cross Runway 18R; and hold short of 18L on Taxiway WM. I misunderstood the clearance; and thought we had been cleared to cross both 18L and 18R. I verbalized; 'Roger; cleared to cross'; and crossed both runways. We had not been cleared to cross Runway 18L; and I realized this after we crossed and heard an aircraft abort due to traffic on the runway. I believe that rather than saying; 'Cleared to cross'; if I had said; 'Cleared to cross both 18L and 18R'; it would have improved our chances of correcting my misunderstanding of the clearance.

Data retrieved from NASA's ASRS site as of July 2013 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.