C172 pilot took off when he was told to taxi clear of runway.

Attributes
ACN	421421
Time
Date	199811
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cmh
State Reference	OH
Altitude	agl bound lower : 0 agl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Flight Plan	VFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Experience	flight time last 90 days : 8 flight time total : 155 flight time type : 8
ASRS Report	421421
Person 2
Affiliation	government : faa
Function	controller : local
Events
Anomaly	non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : insufficient time
Consequence	faa : reviewed incident with flight crew
Supplementary
Air Traffic Incident	Pilot Deviation

Narrative:

I was practicing touch-and-goes when, on downwind for my second landing, ATC instructed me to pull off at the intersection H. I misunderstood him and proceeded to take off again. The controller asked me if I understood his instruction (to pull off and stop), and I said I didn't. He again instructed me to land, full stop after my third takeoff. I misheard his instructions not to continue a touch-and-go. I called ATC later that evening and spoke with the supervisor who was aware of the situation. He said I was to stop because of possible wake turbulence from a B757 that had departed from the same runway. I told him I misunderstood my instructions and admitted I should have read them back verbatim to ATC. I need to be more attentive and not assume I'm cleared to do a touch-and-go unless told to do so by ATC.

Original NASA ASRS Text

Title: C172 PLT TOOK OFF WHEN HE WAS TOLD TO TAXI CLR OF RWY.

Narrative: I WAS PRACTICING TOUCH-AND-GOES WHEN, ON DOWNWIND FOR MY SECOND LNDG, ATC INSTRUCTED ME TO PULL OFF AT THE INTXN H. I MISUNDERSTOOD HIM AND PROCEEDED TO TAKE OFF AGAIN. THE CTLR ASKED ME IF I UNDERSTOOD HIS INSTRUCTION (TO PULL OFF AND STOP), AND I SAID I DIDN'T. HE AGAIN INSTRUCTED ME TO LAND, FULL STOP AFTER MY THIRD TKOF. I MISHEARD HIS INSTRUCTIONS NOT TO CONTINUE A TOUCH-AND-GO. I CALLED ATC LATER THAT EVENING AND SPOKE WITH THE SUPVR WHO WAS AWARE OF THE SIT. HE SAID I WAS TO STOP BECAUSE OF POSSIBLE WAKE TURB FROM A B757 THAT HAD DEPARTED FROM THE SAME RWY. I TOLD HIM I MISUNDERSTOOD MY INSTRUCTIONS AND ADMITTED I SHOULD HAVE READ THEM BACK VERBATIM TO ATC. I NEED TO BE MORE ATTENTIVE AND NOT ASSUME I'M CLRED TO DO A TOUCH-AND-GO UNLESS TOLD TO DO SO BY 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.