Accident Overview
On July 11, 2015, at approximately 0815 eastern daylight time, a Luscombe 8A, registration N28864, conducted a forced landing following a partial loss of engine power during the initial climb from Mid Florida Air Service Airport (X55) in Mount Dora, Florida. The aircraft was operating as an instructional flight under Title 14 Code of Federal Regulations Part 91. The student pilot and flight instructor were not injured, and the airplane was substantially damaged. Day visual meteorological conditions prevailed, and no flight plan was filed.
Preflight and Takeoff
According to the flight instructor, all pre-departure operations were normal. The student pilot sumped the fuel gascolator and observed no contamination or water. The student pilot, who also owned the airplane, initiated the takeoff roll. The engine initially developed power normally and ran smoothly.
Loss of Power and Forced Landing
About 150 feet above ground level during the initial climb, the engine began to lose power. The instructor took control and executed a left turn toward a road in a residential area. During the forced landing attempt, the left wing impacted trees before touchdown, and the airplane came to rest upright.
Wreckage Examination
A Federal Aviation Administration (FAA) inspector examined the wreckage at the accident site. The fuselage exhibited structural damage from impact forces. The left wing was sheared off about three feet from the wing tip, and the left wing spar was broken at the wing strut attachment point. The rear fuselage was buckled between the aft cabin wall and the empennage. The wreckage was moved to a hangar for a more detailed inspection.
Engine and Fuel System Inspection
On July 13, 2015, the engine and fuel system were examined by an FAA airworthiness inspector. The fuel tank contained automotive gasoline (auto gas) with a strong smell of ethanol. There were no placards on the aircraft, nor maintenance entries in the airframe logbooks, permitting the use of auto gas. The fuel tank was drained; the liquid was yellow in color and contained black, granular sediment. Red/orange discoloration was observed on all cylinders in the areas of the exhaust valves, indicative of operation at high exhaust gas temperatures. The carburetor body and seals were wet with fuel. The fuel primer was in the "on" position. The lower engine cowling had fuel staining signatures near the area of the carburetor and trailing in the aft direction. Minor corrosion was found inside the fuel gascolator bowl.
Maintenance and Fuel History
According to the maintenance logbooks, an annual inspection of the airframe and engine was completed on June 22, 2015. The airplane was stored outside, and no determination could be made as to how or when the granular contamination was introduced into the fuel tank. According to the airworthiness inspector and FAA Special Airworthiness Information Bulletin CE-07-06, dated October 27, 2006, ethanol is not permitted for aircraft with or without a Supplemental Type Certificate (STC) for auto gas use.
Pilot's Understanding
The FAA coordinator reported that the aircraft owner, who was also the student pilot, was under the impression that auto gas could be used in his airplane. The coordinator confirmed that no STC existed for the accident airplane to use auto gas. She also stated that the amount of contamination in the fuel tank was sufficient to interrupt fuel flow to the engine.