NTSB Factual Report

The pilot reported that during an aerial application flight the engine lost power due to fuel exhaustion. The pilot reported that there were no mechanical abnormalities with the engine or airframe. The helicopter’s fuel system was not inspected by the NTSB or the FAA because the helicopter was in the process of being disassembled prior to the NTSB or FAA being notified of the accident.

NTSB Probable Cause

A total loss of engine power due to fuel exhaustion as a result of the pilot's failure to ensure that adequate fuel was aboard for the flight.