Narrative:

We were cleared into position and hold on runway 17R. A B757 had just departed. I started the time when the B757 started its takeoff roll. Tower then cleared us for takeoff 1 min 20 seconds after the B757 began its takeoff. I told the first officer to tell the tower we needed a full 2 mins. I could not see the distance of the B757 on the TCAS because the symbol for the B757 would appear and then disappear on our TCAS screen. After the first officer told tower we needed the 2 mins he got irritated and told us to clear the runway to the left. He said next time we need to tell him when we want the full 2 mins. I got irritated because he was trying to clear us for takeoff 40 seconds early behind one of the worst wake turbulence aircraft in the industry. Then as we taxied clear he asked us in a sarcastic voice if we were ready to go (he had given clearance to an MD80 to taxi into position and hold; which I thought had been cleared for takeoff). My first officer told him we were ready and then I keyed the microphone and told him that we just needed the 2 mins for wake separation and that is all. While I was talking to him I let the aircraft roll about half a plane's length past the hold short line thinking he had cleared us into position. The first officer did a good job and gave me the heads up that we were not cleared into position yet. Our position in relation to the MD80 was well behind him and at no time did we ever cause a conflict with him. After the MD80 was cleared for takeoff we were given instructions to taxi into position and hold. I believe the event occurred because I let the tower controller get to me. I was too concerned with why he would try to clear us for takeoff that close to a B757 and what I could say to him that I let it interfere with the job at hand.

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Original NASA ASRS Text

Title: EMB145 CREW CROSSES HOLD LINE WHILE WAITING FOR CLRNC FROM TWR AT DFW.

Narrative: WE WERE CLRED INTO POS AND HOLD ON RWY 17R. A B757 HAD JUST DEPARTED. I STARTED THE TIME WHEN THE B757 STARTED ITS TKOF ROLL. TWR THEN CLRED US FOR TKOF 1 MIN 20 SECONDS AFTER THE B757 BEGAN ITS TKOF. I TOLD THE FO TO TELL THE TWR WE NEEDED A FULL 2 MINS. I COULD NOT SEE THE DISTANCE OF THE B757 ON THE TCAS BECAUSE THE SYMBOL FOR THE B757 WOULD APPEAR AND THEN DISAPPEAR ON OUR TCAS SCREEN. AFTER THE FO TOLD TWR WE NEEDED THE 2 MINS HE GOT IRRITATED AND TOLD US TO CLR THE RWY TO THE L. HE SAID NEXT TIME WE NEED TO TELL HIM WHEN WE WANT THE FULL 2 MINS. I GOT IRRITATED BECAUSE HE WAS TRYING TO CLR US FOR TKOF 40 SECONDS EARLY BEHIND ONE OF THE WORST WAKE TURB ACFT IN THE INDUSTRY. THEN AS WE TAXIED CLR HE ASKED US IN A SARCASTIC VOICE IF WE WERE READY TO GO (HE HAD GIVEN CLRNC TO AN MD80 TO TAXI INTO POS AND HOLD; WHICH I THOUGHT HAD BEEN CLRED FOR TKOF). MY FO TOLD HIM WE WERE READY AND THEN I KEYED THE MIKE AND TOLD HIM THAT WE JUST NEEDED THE 2 MINS FOR WAKE SEPARATION AND THAT IS ALL. WHILE I WAS TALKING TO HIM I LET THE ACFT ROLL ABOUT HALF A PLANE'S LENGTH PAST THE HOLD SHORT LINE THINKING HE HAD CLRED US INTO POS. THE FO DID A GOOD JOB AND GAVE ME THE HEADS UP THAT WE WERE NOT CLRED INTO POS YET. OUR POS IN RELATION TO THE MD80 WAS WELL BEHIND HIM AND AT NO TIME DID WE EVER CAUSE A CONFLICT WITH HIM. AFTER THE MD80 WAS CLRED FOR TKOF WE WERE GIVEN INSTRUCTIONS TO TAXI INTO POS AND HOLD. I BELIEVE THE EVENT OCCURRED BECAUSE I LET THE TWR CTLR GET TO ME. I WAS TOO CONCERNED WITH WHY HE WOULD TRY TO CLR US FOR TKOF THAT CLOSE TO A B757 AND WHAT I COULD SAY TO HIM THAT I LET IT INTERFERE WITH THE JOB AT HAND.

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.