Narrative:

On taxi out, we held short of runway 12R at taxiway east. We were then instructed to cross runway 12R and expedite for runway 12L. After we crossed, I diverted my attention to instruct the first officer on north frequency 120.05 versus south 118.5. I then focused on an aircraft on approach for runway 12L. I diverted my attention from the taxiway. Simultaneously, as I saw the hold line pass under my nose, I slammed on the brakes and tower said 'stop there.' too late -- 'sick feeling' -- hold line already passed my shoulder and tower sent aircraft on final around. I was instructed to call stl tower supervisor when we landed at mco. Keep task in mind, eyes on taxiway versus trying to figure out which runway the aircraft was landing on -- situational awareness!

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Original NASA ASRS Text

Title: ON TAXI OUT AT STL, PIC BECOMES DISTR IN EXPLAINING FREQ ASSIGNMENT AND CROSSES HOLD SHORT LINE WITH TFC ON FINAL.

Narrative: ON TAXI OUT, WE HELD SHORT OF RWY 12R AT TXWY E. WE WERE THEN INSTRUCTED TO CROSS RWY 12R AND EXPEDITE FOR RWY 12L. AFTER WE CROSSED, I DIVERTED MY ATTN TO INSTRUCT THE FO ON N FREQ 120.05 VERSUS S 118.5. I THEN FOCUSED ON AN ACFT ON APCH FOR RWY 12L. I DIVERTED MY ATTN FROM THE TXWY. SIMULTANEOUSLY, AS I SAW THE HOLD LINE PASS UNDER MY NOSE, I SLAMMED ON THE BRAKES AND TWR SAID 'STOP THERE.' TOO LATE -- 'SICK FEELING' -- HOLD LINE ALREADY PASSED MY SHOULDER AND TWR SENT ACFT ON FINAL AROUND. I WAS INSTRUCTED TO CALL STL TWR SUPVR WHEN WE LANDED AT MCO. KEEP TASK IN MIND, EYES ON TXWY VERSUS TRYING TO FIGURE OUT WHICH RWY THE ACFT WAS LNDG ON -- SITUATIONAL AWARENESS!

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.