RWY INCURSION AS A LNDG TAXIING A320 PIC OFF RWY 22R FAILS TO HEAR THE HOLD SHORT OF RWY 27R WHERE AN MD80 IS ON ITS TKOF ROLL AT ORD; IL.

Narrative

WE WERE CLRED TO LAND RWY 22R; HOLD SHORT RWY 27R AT ORD. ON ROLLOUT; WE EXITED AT TXWY C AND TWR INSTRUCTED US TO HOLD SHORT OF RWY 27R AND REMAIN ON TWR FREQ (126.9). AS WE APCHED THE HOLD SHORT LINE; THE CAPT DID NOT SEEM TO BE SLOWING FOR THE STOP; SO I SAID 'HOLD SHORT.' WE CONTINUED TO ROLL AND THE JUMP SEAT RIDER YELLED 'HOLD SHORT' AND I ALSO YELLED 'HOLD SHORT' AND GOT ON THE BRAKES. THE CAPT ALSO STARTED TO BRAKE AND WE CROSSED THE HOLD SHORT LINE BEFORE WE STOPPED. THERE WAS AN MD80 ROLLING OUT ON RWY 27R. I ESTIMATE ABOUT 1/2 OUR ACFT CROSSED THE HOLD SHORT LINE BEFORE WE STOPPED. IF WE HAD NOT MADE THE ABRUPT STOP; WE WERE IN DANGER OF COLLISION WITH THE MD80. THE LEAD FLT ATTENDANT STATED THAT SEVERAL PAX WERE CONCERNED THAT WE ALMOST HIT THE OTHER JET. THE CAPT SAID THAT SHE DID NOT HEAR THE HOLD SHORT INSTRUCTION. THE CAPT WAS THE PF AND I WAS THE PNF. WE HAD AN EQUIP FAILURE PRIOR TO TKOF THAT WE GOT DEFERRED. THE RADAR FAILED AFTER TKOF; AND WE GOT A RERTE SHORTLY AFTER TKOF. WE HAD A VERY BUSY LEG FROM MCI TO ORD. HOWEVER; WE WERE ALL CAUGHT UP FOR APCH AND THE APCH WAS STABILIZED. SUPPLEMENTAL INFO FROM ACN 556933: DURING THE LNDG ROLL; TWR ISSUED INSTRUCTIONS TO CLR RWY 22R AND HOLD SHORT OF RWY 27R. I DID NOT HEAR THE HOLD SHORT. THE TWR DID NOT COMMENT EXCEPT TO TELL US TO EXPEDITE XING RWY 27 AFTER THE MD80 DEPARTED. THIS WAS THE 4TH DAY OF A 4-DAY TRIP AND THE LONGEST; 3RD LEG OF A 4-LEG DAY. ON THIS LEG; WE HAD 2 MECHANICAL FAILURES; INCLUDING THE LOSS OF WX RADAR IN TSTM CONDITIONS. THIS AND SEVERAL ATC RERTES ADDED TO OUR STRESS LEVEL. THE APCH TO RWY 22R WAS THE TYPICAL SLAM DUNK AND THOUGH I BRIEFED THE REQUIRED ELEMENTS; I FAILED TO STRESS THE NEED FOR MYSELF AND CREW TO BE EXTRA VIGILANT ABOUT INTERSECTING RWYS; WHICH I USUALLY DO. THE TWR WAS EXTREMELY BUSY WITH MANY XMISSIONS AND I WAS STILL INVOLVED WITH THE HIGH SPD PHASE OF THE LNDG WHEN I MISSED THE CALL.