Narrative:

After landing and exiting runway 31C, we were told by the tower controller to 'cross runway 31R, taxi via taxiway north and taxiway P, hold short runway 22L, contact ground.' the clearance was read back and we switched to ground control. Ground instructed us to taxi via taxiway north, taxiway P, cross runway 22L. The first officer read back the clearance. I repeated the clearance to the first officer and we continued our taxi. As we crossed runway 22L the ground controller advised us that we were told to hold short of runway 22L. There was no traffic on the runway or approach. The first officer told the controller that he (the first officer) had read back a clearance to cross runway 22L. Ground then said that it was 'ok, there's no problem.' we continued our taxi to the gate. I think that some of the contributing factors were: 1) the lack of a readback of the hold short instruction by the first officer. He instead read back the clearance that we both heard. 2) the ground controller not requesting the required runway hold short readback. 3) the fact that no mention of runway 22R was ever made by ground control, even though it must be crossed in order to reach runway 22L. 4) the ground controller was busy with numerous aircraft that were waiting on txwys for their gates. The gates and ramps were congested with aircraft being deiced. Supplemental information from acn 496937: I know I heard taxi T other gate and it is what I read back. If it wasn't what the ground controller said, he should have corrected me.

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Original NASA ASRS Text

Title: A B733 CREW AFTER LNDG AT MDW MISINTERPED TAXI CLRNC AND CROSSED A RWY NOT GIVEN CLRNC TO CROSS.

Narrative: AFTER LNDG AND EXITING RWY 31C, WE WERE TOLD BY THE TWR CTLR TO 'CROSS RWY 31R, TAXI VIA TXWY N AND TXWY P, HOLD SHORT RWY 22L, CONTACT GND.' THE CLRNC WAS READ BACK AND WE SWITCHED TO GND CTL. GND INSTRUCTED US TO TAXI VIA TXWY N, TXWY P, CROSS RWY 22L. THE FO READ BACK THE CLRNC. I REPEATED THE CLRNC TO THE FO AND WE CONTINUED OUR TAXI. AS WE CROSSED RWY 22L THE GND CTLR ADVISED US THAT WE WERE TOLD TO HOLD SHORT OF RWY 22L. THERE WAS NO TFC ON THE RWY OR APCH. THE FO TOLD THE CTLR THAT HE (THE FO) HAD READ BACK A CLRNC TO CROSS RWY 22L. GND THEN SAID THAT IT WAS 'OK, THERE'S NO PROB.' WE CONTINUED OUR TAXI TO THE GATE. I THINK THAT SOME OF THE CONTRIBUTING FACTORS WERE: 1) THE LACK OF A READBACK OF THE HOLD SHORT INSTRUCTION BY THE FO. HE INSTEAD READ BACK THE CLRNC THAT WE BOTH HEARD. 2) THE GND CTLR NOT REQUESTING THE REQUIRED RWY HOLD SHORT READBACK. 3) THE FACT THAT NO MENTION OF RWY 22R WAS EVER MADE BY GND CTL, EVEN THOUGH IT MUST BE CROSSED IN ORDER TO REACH RWY 22L. 4) THE GND CTLR WAS BUSY WITH NUMEROUS ACFT THAT WERE WAITING ON TXWYS FOR THEIR GATES. THE GATES AND RAMPS WERE CONGESTED WITH ACFT BEING DEICED. SUPPLEMENTAL INFO FROM ACN 496937: I KNOW I HEARD TAXI T OTHER GATE AND IT IS WHAT I READ BACK. IF IT WASN'T WHAT THE GND CTLR SAID, HE SHOULD HAVE CORRECTED ME.

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.