Pilot reported departing the airport without ATC clearance for take off.

Attributes
ACN	1713064
Time
Date	201912
Local Time Of Day	0601-1200
Place
Locale Reference	BOW.Tower
State Reference	FL
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Flight Plan	None
Person 1
Function	Pilot Flying
Qualification	Flight Crew Instrument Flight Crew Private
Experience	Flight Crew Last 90 Days 50 Flight Crew Total 230 Flight Crew Type 150
Events
Anomaly	Deviation - Procedural FAR Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Ground Incursion Runway

Narrative:

After landing and requesting a taxi clearance we were instructed to do a back taxi for a departure. We took off without getting the proper clearance from the controller. Tower informed us of the requirements for the takeoff clearance for the next time we needed to back taxi.

Original NASA ASRS Text

Title: Pilot reported departing the airport without ATC clearance for take off.

Narrative: After landing and requesting a taxi clearance we were instructed to do a back taxi for a departure. We took off without getting the proper clearance from the controller. Tower informed us of the requirements for the takeoff clearance for the next time we needed to back taxi.

Data retrieved from NASA's ASRS site 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.