At approximately 1320 Pacific time, the airplane was destroyed when it impacted terrain. The Private pilot was fatally injured. Visual conditions prevailed. After the pilot reported a two-mile base leg for landing, a witness on the ground heard a loud bang and looked up to see blue-gray smoke coming from the aircraft. Another witness saw the aircraft making a low left turn when it flipped inverted and spiraled to the ground. A post-impact fire consumed the airplane.