Narrative:

Taxiing out for takeoff in macon, GA, I called the tower and said we were ready for takeoff. The tower then cleared us into position and hold for runway 5. Well, we got onto the end of the runway and began a takeoff roll. We got down the runway about 700 ft and the tower told us that we were not cleared to takeoff. We immediately aborted the takeoff. I asked the tower if there was any problem and they said no. I think fatigue had a lot to do with this, it was the last leg of a long 2 day trip. I need to be more aware of our clearance even when I am tired. In the future I will say out loud what our clearance is after I have read the clearance back to ATC.

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Original NASA ASRS Text

Title: FLC OF LTT FAILED TO HOLD IN POS FOR TKOF AS INSTRUCTED BY TWR AND STARTED TKOF WHEREIN CTLR INTERVENED AND TKOF WAS ABORTED.

Narrative: TAXIING OUT FOR TKOF IN MACON, GA, I CALLED THE TWR AND SAID WE WERE READY FOR TKOF. THE TWR THEN CLRED US INTO POS AND HOLD FOR RWY 5. WELL, WE GOT ONTO THE END OF THE RWY AND BEGAN A TKOF ROLL. WE GOT DOWN THE RWY ABOUT 700 FT AND THE TWR TOLD US THAT WE WERE NOT CLRED TO TKOF. WE IMMEDIATELY ABORTED THE TKOF. I ASKED THE TWR IF THERE WAS ANY PROB AND THEY SAID NO. I THINK FATIGUE HAD A LOT TO DO WITH THIS, IT WAS THE LAST LEG OF A LONG 2 DAY TRIP. I NEED TO BE MORE AWARE OF OUR CLRNC EVEN WHEN I AM TIRED. IN THE FUTURE I WILL SAY OUT LOUD WHAT OUR CLRNC IS AFTER I HAVE READ THE CLRNC BACK TO ATC.

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.