Narrative:

We had been cleared to taxi from gate via taxiway a to taxiway A9 and taxiway T. I taxied forward towards taxiway a and ended up stopping just shy of taxiway a due to an rj waiting for guidance in to a gate at the south end of the C concourse. The first officer asked ground if we could taxi out taxiway A6 to get around the rj; but his transmission was blocked. The next thing I saw was another rj with its left wing going under our nose. He was moving very fast and had I not already stopped I am quite sure there would have been a collision. When I had first started taxiing out; the first officer had not seen anyone coming around the right side of us but as fast as this aircraft was moving; I am not surprised he didn't see it as it probably had not been in his sight field. The first officer immediately notified ground control of the near miss and he responded that they had seen it in the tower and 'would take care of it.' I do not have the flight number of the rj; but I hope that captain will think twice about attempting to out-run an aircraft 10 times his size. I have noticed before that the inbound ground controller and the outbound ground controller do not always seem to be communicating as I have had to stop for inbound aircraft many times after having been cleared to taxi. This was a very near miss that could have caused substantial aircraft damage to both aircraft.

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Original NASA ASRS Text

Title: A B747-400 TAXIING AT ORD WAS INVOLVED IN A NEAR COLLISION WITH AN RJ.

Narrative: WE HAD BEEN CLRED TO TAXI FROM GATE VIA TXWY A TO TXWY A9 AND TXWY T. I TAXIED FORWARD TOWARDS TXWY A AND ENDED UP STOPPING JUST SHY OF TXWY A DUE TO AN RJ WAITING FOR GUIDANCE IN TO A GATE AT THE S END OF THE C CONCOURSE. THE FO ASKED GND IF WE COULD TAXI OUT TXWY A6 TO GET AROUND THE RJ; BUT HIS XMISSION WAS BLOCKED. THE NEXT THING I SAW WAS ANOTHER RJ WITH ITS L WING GOING UNDER OUR NOSE. HE WAS MOVING VERY FAST AND HAD I NOT ALREADY STOPPED I AM QUITE SURE THERE WOULD HAVE BEEN A COLLISION. WHEN I HAD FIRST STARTED TAXIING OUT; THE FO HAD NOT SEEN ANYONE COMING AROUND THE R SIDE OF US BUT AS FAST AS THIS ACFT WAS MOVING; I AM NOT SURPRISED HE DIDN'T SEE IT AS IT PROBABLY HAD NOT BEEN IN HIS SIGHT FIELD. THE FO IMMEDIATELY NOTIFIED GND CTL OF THE NEAR MISS AND HE RESPONDED THAT THEY HAD SEEN IT IN THE TWR AND 'WOULD TAKE CARE OF IT.' I DO NOT HAVE THE FLT NUMBER OF THE RJ; BUT I HOPE THAT CAPT WILL THINK TWICE ABOUT ATTEMPTING TO OUT-RUN AN ACFT 10 TIMES HIS SIZE. I HAVE NOTICED BEFORE THAT THE INBOUND GND CTLR AND THE OUTBOUND GND CTLR DO NOT ALWAYS SEEM TO BE COMMUNICATING AS I HAVE HAD TO STOP FOR INBOUND ACFT MANY TIMES AFTER HAVING BEEN CLRED TO TAXI. THIS WAS A VERY NEAR MISS THAT COULD HAVE CAUSED SUBSTANTIAL ACFT DAMAGE TO BOTH ACFT.

Data retrieved from NASA's ASRS site as of January 2009 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.