Incident Overview
Aircraft on approach to Greenville Spartanburg Airport reported twenty minutes of fuel remaining to air traffic control. Controllers offered vectors to an alternate airport three miles from the aircraft's position, but the pilot declined. Shortly thereafter, the pilot requested a diversion to that alternate airport, which was approved. Approximately two miles from the alternate airport, the pilot reported a loss of engine power and declared an emergency landing. Controllers advised of a highway less than one mile away. During the emergency approach, the pilot attempted a 180-degree turn to avoid oncoming automotive traffic, and the airplane subsequently impacted trees off the highway.
Pilot's Fuel Planning
The pilot stated that during preflight planning, he calculated twenty minutes of reserve fuel. He noted that during the flight, the actual time en route was less than planned, leading him to believe sufficient fuel remained. However, he acknowledged that he failed to account for his use of 75% power during the flight, whereas preflight calculations were based on 65% power. The additional fuel burn resulting from the higher power setting was not considered.
Emergency Approach and Outcome
After the engine power loss, the pilot executed an emergency approach toward the highway identified by air traffic control. While attempting to avoid vehicles on the road, the pilot turned sharply, and the aircraft struck trees adjacent to the highway. The aircraft sustained damage, but no injuries were reported.