Pilot flying C421 takes off without clearance.

Attributes
ACN	439835
Time
Date	199905
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : arb.airport
State Reference	MI
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : arb.tower tower : gso.tower
Operator	general aviation : personal
Make Model Name	Golden Eagle 421
Operating Under FAR Part	Part 91
Flight Phase	ground : takeoff roll
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot oversight : pic
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Experience	flight time last 90 days : 25 flight time total : 1200 flight time type : 550
ASRS Report	439835
Person 2
Affiliation	other
Function	maintenance : technician observation : observer
Events
Anomaly	incursion : runway non adherence : far
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Cleared to taxi, runway 24. Apparently I took off without tower clearance. The pilot and mechanic were not aware of a problem. Ground did not say anything when we started to roll. It was a VFR day and no immediate traffic was in the pattern. No flight deviations were required by other aircraft.

Original NASA ASRS Text

Title: PLT FLYING C421 TAKES OFF WITHOUT CLRNC.

Narrative: CLRED TO TAXI, RWY 24. APPARENTLY I TOOK OFF WITHOUT TWR CLRNC. THE PLT AND MECH WERE NOT AWARE OF A PROB. GND DID NOT SAY ANYTHING WHEN WE STARTED TO ROLL. IT WAS A VFR DAY AND NO IMMEDIATE TFC WAS IN THE PATTERN. NO FLT DEVS WERE REQUIRED BY OTHER ACFT.

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.