Narrative:

Chicago midway ATIS stated midway was taking off and landing runway 4R. We pushed back from gate. Taxi clearance was to taxi on yankee; hold short of papa; expect runway 13C. While holding short of papa on yankee; the first officer recomputed takeoff data for runway 13C and we held for a company aircraft to land and clear runway 4R at papa.after the company aircraft cleared at papa; ground told us to taxi. The taxi clearance the first officer and I both heard was on papa to cross 4R. My first officer keyed the mic and said; 'right on papa cross 4R.' I started to turn on papa and had turned about 45 degrees when we received additional ground direction to stop. The right wingtip had momentarily crossed the hold short line for 4R. Recognizing I was on an active runway; I immediately reversed my taxi back onto yankee. After maneuvering our aircraft back onto yankee; we saw a company aircraft on final to runway 4R initiating a go-around.ground then told us to taxi straight ahead on yankee to runway 31R and hold short of 4R. As we were taxiing; ground then cleared us to cross 4R; 4L; left on november; taxi to 13C. The rest of out taxi and flight were uneventful.

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Original NASA ASRS Text

Title: An air carrier crew was commanded to stop while entering MDW Runway 4R after a departure runway change. An aircraft on final executed a go-around.

Narrative: Chicago Midway ATIS stated Midway was taking off and landing Runway 4R. We pushed back from gate. Taxi clearance was to taxi on Yankee; hold short of Papa; expect Runway 13C. While holding short of Papa on Yankee; the First Officer recomputed takeoff data for Runway 13C and we held for a Company aircraft to land and clear Runway 4R at Papa.After the Company aircraft cleared at Papa; Ground told us to taxi. The taxi clearance the First Officer and I both heard was on Papa to cross 4R. My First Officer keyed the mic and said; 'Right on Papa cross 4R.' I started to turn on Papa and had turned about 45 degrees when we received additional Ground direction to stop. The right wingtip had momentarily crossed the hold short line for 4R. Recognizing I was on an active runway; I immediately reversed my taxi back onto Yankee. After maneuvering our aircraft back onto Yankee; we saw a Company aircraft on final to Runway 4R initiating a go-around.Ground then told us to taxi straight ahead on Yankee to Runway 31R and hold short of 4R. As we were taxiing; Ground then cleared us to cross 4R; 4L; left on November; taxi to 13C. The rest of out taxi and flight were uneventful.

Data retrieved from NASA's ASRS site as of April 2012 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.