Pilot of a C172RG failed to hold short of runway as instructed by tower controller and subsequently started takeoff roll without takeoff clearance.

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Attributes
ACN	451751
Time
Date	199910
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Cardinal 177/177RG
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff ground : taxi ground : takeoff roll
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 8 flight time total : 529 flight time type : 11
ASRS Report	451751
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	airspace violation : entry incursion : runway non adherence : clearance non adherence : far
Independent Detector	other controllera
Resolutory Action	controller : issued alert none taken : anomaly accepted other
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was talking to the controller, but he had not actually cleared me onto the runway. I proceeded onto the runway and was told I was not cleared onto runway. Once on the runway, I then was talking to the controller, started my roll, and realized he had not said 'cleared to take off.'

Original NASA ASRS Text

Title: PLT OF A C172RG FAILED TO HOLD SHORT OF RWY AS INSTRUCTED BY TWR CTLR AND SUBSEQUENTLY STARTED TKOF ROLL WITHOUT TKOF CLRNC.

Narrative: I WAS TALKING TO THE CTLR, BUT HE HAD NOT ACTUALLY CLRED ME ONTO THE RWY. I PROCEEDED ONTO THE RWY AND WAS TOLD I WAS NOT CLRED ONTO RWY. ONCE ON THE RWY, I THEN WAS TALKING TO THE CTLR, STARTED MY ROLL, AND REALIZED HE HAD NOT SAID 'CLRED TO TAKE OFF.'

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.