BE55 taxied into position at ads without ATC clearance.

Attributes
ACN	614133
Time
Date	200404
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ads.airport
State Reference	TX
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : crp.tower
Operator	general aviation : corporate
Make Model Name	Baron 55/Cochise
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi ground : position and hold
Flight Plan	None
Person 1
Affiliation	company : corporate
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial pilot : cfi pilot : atp pilot : multi engine
Experience	flight time last 90 days : 90 flight time total : 8500 flight time type : 300
ASRS Report	614133
Person 2
Affiliation	government : faa
Function	controller : local
Events
Anomaly	incursion : runway non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued advisory controller : issued new clearance
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I have been in and out of addison many times. 4 times in the next week after this event of which 2 were in the barron and 2 in a hawker. I was cleared to taxi to runway 33. There were a couple of planes ahead of me and I asked ground if I could take one of the intxns near the end of runway 33. He approved this. By the time I got down there, the other aircraft had been cleared for takeoff and I taxied to the end. I called tower and told them I was ready for takeoff on runway 33. I thought I heard 'barron X, taxi into position and hold full length.' I thought I repeated this. I was holding and the controller came on and said 'barron X.' I replied and he then told me he cleared me to taxi up to and hold short. I apologized and offered to expedite off the runway, and he told me to continue holding in position. Approximately 15 seconds later, he cleared me for takeoff. I tried to call saturday and sunday, but no answer from the tower phone. One of the two of us made a mistake. The controller was very nice and professional. The one thing I do remember 100% was the quote of 'full length' in the statement from him. I certainly thought it was a clearance to taxi position and hold full length as the other aircraft was on the roll and there was no other airplane close to the airport for landing. I was wearing headsets. I could hear very well and there is really no excuse other than miscom. I have a hard time believing I read back hold short and continued to taxi. If I did do this, this is a first in almost 9000 hours of flying.

Original NASA ASRS Text

Title: BE55 TAXIED INTO POS AT ADS WITHOUT ATC CLRNC.

Narrative: I HAVE BEEN IN AND OUT OF ADDISON MANY TIMES. 4 TIMES IN THE NEXT WEEK AFTER THIS EVENT OF WHICH 2 WERE IN THE BARRON AND 2 IN A HAWKER. I WAS CLRED TO TAXI TO RWY 33. THERE WERE A COUPLE OF PLANES AHEAD OF ME AND I ASKED GND IF I COULD TAKE ONE OF THE INTXNS NEAR THE END OF RWY 33. HE APPROVED THIS. BY THE TIME I GOT DOWN THERE, THE OTHER ACFT HAD BEEN CLRED FOR TKOF AND I TAXIED TO THE END. I CALLED TWR AND TOLD THEM I WAS READY FOR TKOF ON RWY 33. I THOUGHT I HEARD 'BARRON X, TAXI INTO POS AND HOLD FULL LENGTH.' I THOUGHT I REPEATED THIS. I WAS HOLDING AND THE CTLR CAME ON AND SAID 'BARRON X.' I REPLIED AND HE THEN TOLD ME HE CLRED ME TO TAXI UP TO AND HOLD SHORT. I APOLOGIZED AND OFFERED TO EXPEDITE OFF THE RWY, AND HE TOLD ME TO CONTINUE HOLDING IN POS. APPROX 15 SECONDS LATER, HE CLRED ME FOR TKOF. I TRIED TO CALL SATURDAY AND SUNDAY, BUT NO ANSWER FROM THE TWR PHONE. ONE OF THE TWO OF US MADE A MISTAKE. THE CTLR WAS VERY NICE AND PROFESSIONAL. THE ONE THING I DO REMEMBER 100% WAS THE QUOTE OF 'FULL LENGTH' IN THE STATEMENT FROM HIM. I CERTAINLY THOUGHT IT WAS A CLRNC TO TAXI POS AND HOLD FULL LENGTH AS THE OTHER ACFT WAS ON THE ROLL AND THERE WAS NO OTHER AIRPLANE CLOSE TO THE ARPT FOR LNDG. I WAS WEARING HEADSETS. I COULD HEAR VERY WELL AND THERE IS REALLY NO EXCUSE OTHER THAN MISCOM. I HAVE A HARD TIME BELIEVING I READ BACK HOLD SHORT AND CONTINUED TO TAXI. IF I DID DO THIS, THIS IS A FIRST IN ALMOST 9000 HRS OF FLYING.

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.