The pilot’s failure to detect and remove water contamination from the airplane’s fuel system before the flight, which resulted in a total loss of engine power during initial climb.

The pilot’s loss of control while maneuvering during low-altitude operations due to sudden neurological impairment or incapacitation and the helicopter’s subsequent collision with power lines.

The pilot’s failure to maintain clearance between the tail rotor of his helicopter and a piece of farm equipment during the landing sequence.