What happened
During the preflight phase, the crew identified water in a fuel sample and drained the tanks until clear fuel was obtained. After topping off the fuel tanks, the preflight inspection was completed without further issues. Following the procedures, the pilot began the takeoff roll. Once the aircraft reached rotation speed and became airborne, the landing gear was retracted.
Immediately after takeoff, the right engine suffered a loss of power. The pilot responded by feathering the engine and began an attempt to return to the airport. Shortly after this initial failure, the left engine also lost power. The pilot notified air traffic control that the aircraft had lost all engine power. The aircraft subsequently struck trees and the ground, which led to a post-crash fire.
Findings
An investigation of the airframe and engines showed no mechanical failures or malfunctions that would have prevented the engines from operating normally. Testing of the fuel recovered from the right main tank and the fuel from the fixed base operator showed no irregularities. While the left fuel selector valve was found in the plugged port position, investigators determined it was likely moved to that position during the accident. The right fuel selector valve was found to be unobstructed and partially aligned with the main fuel passage. The reason for the simultaneous loss of power to both engines remained undetermined.