Takeoff without a clearance.

Attributes
ACN	295100
Time
Date	199501
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : rfd
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : rfd
Operator	common carrier : air taxi
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 135
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument pilot : cfi
Experience	flight time last 90 days : 160 flight time total : 1700 flight time type : 260
ASRS Report	295100
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	incursion : runway non adherence : far other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I taxied up to and held short of runway 1 at intersection delta. I then advised rockford tower that I was ready for takeoff from runway 1 intersection delta. I understood and read back the clearance I heard as 'my aircraft cleared for takeoff runway 1 intersection delta, turn to heading of 140 degrees. On climb out the tower advised me that I had accepted a clearance for takeoff that was for another aircraft. I never thought the clearance was for another aircraft and was never told to hold short or never heard the clearance repeated for the other aircraft. When advised what I had done I apologized and because there was only myself and one other aircraft awaiting takeoff my actions never caused any conflict in the air or on the ground. I apologize for any inconvenience this may have caused.

Original NASA ASRS Text

Title: TKOF WITHOUT A CLRNC.

Narrative: I TAXIED UP TO AND HELD SHORT OF RWY 1 AT INTXN DELTA. I THEN ADVISED ROCKFORD TWR THAT I WAS READY FOR TKOF FROM RWY 1 INTXN DELTA. I UNDERSTOOD AND READ BACK THE CLRNC I HEARD AS 'MY ACFT CLRED FOR TKOF RWY 1 INTXN DELTA, TURN TO HDG OF 140 DEGS. ON CLBOUT THE TWR ADVISED ME THAT I HAD ACCEPTED A CLRNC FOR TKOF THAT WAS FOR ANOTHER ACFT. I NEVER THOUGHT THE CLRNC WAS FOR ANOTHER ACFT AND WAS NEVER TOLD TO HOLD SHORT OR NEVER HEARD THE CLRNC REPEATED FOR THE OTHER ACFT. WHEN ADVISED WHAT I HAD DONE I APOLOGIZED AND BECAUSE THERE WAS ONLY MYSELF AND ONE OTHER ACFT AWAITING TKOF MY ACTIONS NEVER CAUSED ANY CONFLICT IN THE AIR OR ON THE GND. I APOLOGIZE FOR ANY INCONVENIENCE THIS MAY HAVE CAUSED.

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.