Takeoff started without clearance at tpa.

Attributes
ACN	480845
Time
Date	200007
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : tpa.airport
State Reference	FL
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : tpa.tower
Operator	common carrier : air carrier
Make Model Name	Beech 1900
Operating Under FAR Part	Part 135
Flight Phase	ground : position and hold
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : tpa.tower
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Route In Use	approach : traffic pattern
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Experience	flight time last 90 days : 166 flight time total : 2174 flight time type : 558
ASRS Report	480845
Person 2
Affiliation	company : air carrier
Function	flight crew : captain
Qualification	pilot : atp
Events
Anomaly	non adherence : published procedure non adherence : far other anomaly other
Independent Detector	other controllerb
Resolutory Action	controller : issued new clearance
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On jul/xa/00, flight was departing tpa to pfn. The captain was flying this leg. The tower cleared us to taxi and position and hold on runway 18R. The tower said traffic Y was on 7 mi final, a cpr Z jet had just departed ahead of us. The captain asked for before takeoff checklist, above and below the line. I read off the checklist and everything was set to go. The captain inadvertently advanced full power and asked for me to set takeoff power. I complied and as we started roll, I was about to ask the captain if we had been cleared for takeoff. Tower then told us we were cleared for takeoff after we had rolled over approximately 1000 ft. We continued takeoff. The tower told us 'next time, wait for takeoff,' after we realized that a major mistake had occurred. I queried the captain 'he said he thought the traffic was on the 2 mi final' instead of 7 mi. After landing in pfn, captain called tpa tower and talked to chief controller, and they said not to worry about it. I think we were in a big hurry to meet schedule, and busy traffic flow in class B airspace. Thankfully nobody was hurt.

Original NASA ASRS Text

Title: TKOF STARTED WITHOUT CLRNC AT TPA.

Narrative: ON JUL/XA/00, FLT WAS DEPARTING TPA TO PFN. THE CAPT WAS FLYING THIS LEG. THE TWR CLRED US TO TAXI AND POS AND HOLD ON RWY 18R. THE TWR SAID TFC Y WAS ON 7 MI FINAL, A CPR Z JET HAD JUST DEPARTED AHEAD OF US. THE CAPT ASKED FOR BEFORE TKOF CHKLIST, ABOVE AND BELOW THE LINE. I READ OFF THE CHKLIST AND EVERYTHING WAS SET TO GO. THE CAPT INADVERTENTLY ADVANCED FULL PWR AND ASKED FOR ME TO SET TKOF PWR. I COMPLIED AND AS WE STARTED ROLL, I WAS ABOUT TO ASK THE CAPT IF WE HAD BEEN CLRED FOR TKOF. TWR THEN TOLD US WE WERE CLRED FOR TKOF AFTER WE HAD ROLLED OVER APPROX 1000 FT. WE CONTINUED TKOF. THE TWR TOLD US 'NEXT TIME, WAIT FOR TKOF,' AFTER WE REALIZED THAT A MAJOR MISTAKE HAD OCCURRED. I QUERIED THE CAPT 'HE SAID HE THOUGHT THE TFC WAS ON THE 2 MI FINAL' INSTEAD OF 7 MI. AFTER LNDG IN PFN, CAPT CALLED TPA TWR AND TALKED TO CHIEF CTLR, AND THEY SAID NOT TO WORRY ABOUT IT. I THINK WE WERE IN A BIG HURRY TO MEET SCHEDULE, AND BUSY TFC FLOW IN CLASS B AIRSPACE. THANKFULLY NOBODY WAS HURT.

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.