What happened
During the initial climb out from Runway 22 at Wausau Downtown Airport in Wausau, Wisconsin, the aircraft's left engine experienced a total loss of engine power.
Prior to takeoff, the pilot completed an abbreviated preflight checklist that included checking the instruments, controls, magnetos, propellers, and performing an engine run-up. The pilot reported that at the end of the runway, he moved a canvas attache case, which was being used as a flight bag, from the floor to the space between the front seats.
The investigation
Investigators examined the aircraft's mechanical systems following the power loss. The throttle, propeller, and mixture controls were all found in their forward positions, and engine control continuity was confirmed. The landing gear was in the down position, and the left engine propeller had not feathered.
Regarding the fuel system, both fuel selectors—located between the pilot and copilot seats—were set to the crossfeed position. To determine if a mechanical failure or blockage was responsible, the left engine was tested on a test stand and found to be operating correctly. Additionally, inspections of the fuel lines and fuel filter screens revealed no obstructions.