A C525 pilot takes off without clearance at srq, fl.

Attributes
ACN	490710
Time
Date	200005
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : srq.airport
State Reference	FL
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : srq.tower
Operator	general aviation : corporate
Make Model Name	Cessna Citation Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : single pilot
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 80 flight time total : 8500 flight time type : 75
ASRS Report	490710
Person 2
Affiliation	company : corporate
Function	observation : observer observation : passenger other personnel other
Events
Anomaly	non adherence : clearance other anomaly other
Independent Detector	other controllerb
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Passenger Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After receiving taxi clearance 'call sign' proceeded to active runway. Owner was in right seat. He was at the time operating radio and having difficulty with intercom. Tower advised position and hold which we did. During this time I thought I heard fly runway heading and responded 'call sign' on the roll. Tower said nothing until 400 ft that I was not cleared to take off. Upon landing in tlh I telephoned back with information and told no problem, etc. Reviewed procedures, etc. Key here is owner in aircraft not fully knowing how to work radio, etc.

Original NASA ASRS Text

Title: A C525 PLT TAKES OFF WITHOUT CLRNC AT SRQ, FL.

Narrative: AFTER RECEIVING TAXI CLRNC 'CALL SIGN' PROCEEDED TO ACTIVE RWY. OWNER WAS IN R SEAT. HE WAS AT THE TIME OPERATING RADIO AND HAVING DIFFICULTY WITH INTERCOM. TWR ADVISED POS AND HOLD WHICH WE DID. DURING THIS TIME I THOUGHT I HEARD FLY RWY HEADING AND RESPONDED 'CALL SIGN' ON THE ROLL. TWR SAID NOTHING UNTIL 400 FT THAT I WAS NOT CLRED TO TAKE OFF. UPON LNDG IN TLH I TELEPHONED BACK WITH INFO AND TOLD NO PROB, ETC. REVIEWED PROCS, ETC. KEY HERE IS OWNER IN ACFT NOT FULLY KNOWING HOW TO WORK RADIO, ETC.

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.