Narrative:

I was given a position and hold clearance on runway 13R. I taxied onto runway and initiated the takeoff. Tower advised I was not cleared for takeoff, so I started an abort. Looking down the runway, I noticed a B767 had just cleared the runway. Even if I had continued the takeoff I would have rotated well before and cleared the B767 with ample room to spare. This was to be my last flight segment on what was a long duty period. The completion of this flight would have put me right at the legal limit for duty time. With this in mind I was in a bit of a hurry and regretfully when given the position and hold instruction by ATC, I heard what I wanted to hear, rather than what was said. Even 1 min of extra deliberation, due care and attention could have prevented this incident. Fortunately, there was no adverse consequences as a result of my incompetence in this matter except to my price. Due to the long duty period, tiredness may have also been a factor in this incident. However, I must listen very carefully to all ATC clrncs. The consequences of not doing so will be disastrous.

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Original NASA ASRS Text

Title: A BE1900 FLTCREW MISUNDERSTAND A TIPH CLRNC AS A CLRNC TO TAKE OFF. TWR ISSUED ADVISORY AND ACFT ABORTED.

Narrative: I WAS GIVEN A POS AND HOLD CLRNC ON RWY 13R. I TAXIED ONTO RWY AND INITIATED THE TKOF. TWR ADVISED I WAS NOT CLRED FOR TKOF, SO I STARTED AN ABORT. LOOKING DOWN THE RWY, I NOTICED A B767 HAD JUST CLRED THE RWY. EVEN IF I HAD CONTINUED THE TKOF I WOULD HAVE ROTATED WELL BEFORE AND CLRED THE B767 WITH AMPLE ROOM TO SPARE. THIS WAS TO BE MY LAST FLT SEGMENT ON WHAT WAS A LONG DUTY PERIOD. THE COMPLETION OF THIS FLT WOULD HAVE PUT ME RIGHT AT THE LEGAL LIMIT FOR DUTY TIME. WITH THIS IN MIND I WAS IN A BIT OF A HURRY AND REGRETFULLY WHEN GIVEN THE POS AND HOLD INSTRUCTION BY ATC, I HEARD WHAT I WANTED TO HEAR, RATHER THAN WHAT WAS SAID. EVEN 1 MIN OF EXTRA DELIBERATION, DUE CARE AND ATTN COULD HAVE PREVENTED THIS INCIDENT. FORTUNATELY, THERE WAS NO ADVERSE CONSEQUENCES AS A RESULT OF MY INCOMPETENCE IN THIS MATTER EXCEPT TO MY PRICE. DUE TO THE LONG DUTY PERIOD, TIREDNESS MAY HAVE ALSO BEEN A FACTOR IN THIS INCIDENT. HOWEVER, I MUST LISTEN VERY CAREFULLY TO ALL ATC CLRNCS. THE CONSEQUENCES OF NOT DOING SO WILL BE DISASTROUS.

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.