Narrative:

I was on a flight to wenatchee, wa, (eat). I taxied to runway 25 at intersection lima. I was given a clearance to taxi into position to hold on runway 25 at lima and west/O further clearance I departed runway 25. Just prior to my clearance to taxi into position to hold a metroliner was given a clearance to takeoff from runway 21. The crew noticed that I had departed runway 25 and called the tower and asked, 'is that an airplane ahead of us.' tower immediately called me and advised me that I was only given a clearance to taxi into position to hold, not for takeoff. At that point I realized my mistake but was already through the intersecting runway, so there was no evasive action necessary. As far as how to avoid this situation from happening again in the future, there really is no excuse for my actions. Callback conversation with reporter revealed the following information. Reporter stated he holds a communication and instrument rating. Fly hours total 1700, in type 1000. Reporter stated he thinks both aircraft were airborne but does how close they came. Reporter refused to review the incident with the tower. FAA has sent a letter of proposed suspension of license.

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Original NASA ASRS Text

Title: ATX X HAD LESS THAN STANDARD SEPARATION FROM ACR Y. ATX X NON ADHERENCE TO ATC CLRNC.

Narrative: I WAS ON A FLT TO WENATCHEE, WA, (EAT). I TAXIED TO RWY 25 AT INTXN LIMA. I WAS GIVEN A CLRNC TO TAXI INTO POS TO HOLD ON RWY 25 AT LIMA AND W/O FURTHER CLRNC I DEPARTED RWY 25. JUST PRIOR TO MY CLRNC TO TAXI INTO POS TO HOLD A METROLINER WAS GIVEN A CLRNC TO TKOF FROM RWY 21. THE CREW NOTICED THAT I HAD DEPARTED RWY 25 AND CALLED THE TWR AND ASKED, 'IS THAT AN AIRPLANE AHEAD OF US.' TWR IMMEDIATELY CALLED ME AND ADVISED ME THAT I WAS ONLY GIVEN A CLRNC TO TAXI INTO POS TO HOLD, NOT FOR TKOF. AT THAT POINT I REALIZED MY MISTAKE BUT WAS ALREADY THROUGH THE INTERSECTING RWY, SO THERE WAS NO EVASIVE ACTION NECESSARY. AS FAR AS HOW TO AVOID THIS SITUATION FROM HAPPENING AGAIN IN THE FUTURE, THERE REALLY IS NO EXCUSE FOR MY ACTIONS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO. RPTR STATED HE HOLDS A COM AND INST RATING. FLY HRS TOTAL 1700, IN TYPE 1000. RPTR STATED HE THINKS BOTH ACFT WERE AIRBORNE BUT DOES HOW CLOSE THEY CAME. RPTR REFUSED TO REVIEW THE INCIDENT WITH THE TWR. FAA HAS SENT A LETTER OF PROPOSED SUSPENSION OF LICENSE.

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.