Narrative:

Initial taxi clearance: taxi taxiway K, taxiway south, hold short of runway 4L for runway 9. While holding short, I heard a call to cross runway 4L, monitor 119.1 on the other side, but this call was for the air carrier Y MD80 ahead at taxiway east. I thought first officer responded to controller, but he later said he didn't. I must have heard the air carrier Y pilot respond. I repeated the clearance out loud thinking it was for us. First officer didn't correct me because he thought he missed the call and that I was responding/transmitting over the radio. In fact, I was simply repeating a clearance that I thought he had responded to. I looked both ways and the runway and final were clear. I then crossed illegally. Contributing factors: I was tired from reduced rest overnight. Although I should not fly tired, the reality is with the FARS written as is, many pilots fly tired (or we'd never fly) and this will not change until the FAA changes the FARS. A certain amount of my own complacency is also to blame. (I was told to contact the tower after the flight, and by that time I had figured out what had happened regarding the miscom in the cockpit. No aircraft conflict arose from this incursion.)

Related reports:

Google
 

Original NASA ASRS Text

Title: CAPT OF A JETSTREAM 4100 TOOK TAXI CLRNC BY LCL CTL TO CROSS RWY AND HOLD BY MISTAKE WHICH WAS MEANT FOR AN MD80 HOLDING AT ANOTHER RWY TXWY INTXN.

Narrative: INITIAL TAXI CLRNC: TAXI TXWY K, TXWY S, HOLD SHORT OF RWY 4L FOR RWY 9. WHILE HOLDING SHORT, I HEARD A CALL TO CROSS RWY 4L, MONITOR 119.1 ON THE OTHER SIDE, BUT THIS CALL WAS FOR THE ACR Y MD80 AHEAD AT TXWY E. I THOUGHT FO RESPONDED TO CTLR, BUT HE LATER SAID HE DIDN'T. I MUST HAVE HEARD THE ACR Y PLT RESPOND. I REPEATED THE CLRNC OUT LOUD THINKING IT WAS FOR US. FO DIDN'T CORRECT ME BECAUSE HE THOUGHT HE MISSED THE CALL AND THAT I WAS RESPONDING/XMITTING OVER THE RADIO. IN FACT, I WAS SIMPLY REPEATING A CLRNC THAT I THOUGHT HE HAD RESPONDED TO. I LOOKED BOTH WAYS AND THE RWY AND FINAL WERE CLR. I THEN CROSSED ILLEGALLY. CONTRIBUTING FACTORS: I WAS TIRED FROM REDUCED REST OVERNIGHT. ALTHOUGH I SHOULD NOT FLY TIRED, THE REALITY IS WITH THE FARS WRITTEN AS IS, MANY PLTS FLY TIRED (OR WE'D NEVER FLY) AND THIS WILL NOT CHANGE UNTIL THE FAA CHANGES THE FARS. A CERTAIN AMOUNT OF MY OWN COMPLACENCY IS ALSO TO BLAME. (I WAS TOLD TO CONTACT THE TWR AFTER THE FLT, AND BY THAT TIME I HAD FIGURED OUT WHAT HAD HAPPENED REGARDING THE MISCOM IN THE COCKPIT. NO ACFT CONFLICT AROSE FROM THIS INCURSION.)

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.