Primary finding
Probable cause
A partial loss of engine power for reasons that could not be determined based on the available information.
Investigator assessment
Analysis narrative
Witnesses reported that they observed the pilot of the experimental, amateur-built airplane performing touch-and-go landings. The airplane flew for about 30 minutes before the engine lost power, and the airplane crashed into trees. The pilot did not recall the accident. Examination of the airframe did not reveal any anomalies. Fuel was observed in the fuel tank, and an examination of the fuel system did not reveal any fuel contamination. Although the wreckage examination revealed that the loss of engine power was likely not related to fuel quantity or fuel contamination, no additional examination of the engine was performed; thus, the reason for the partial loss of engine power could not be determined.
Source record
Factual narrative
On October 6, 2016, about 1700 eastern daylight time, an experimental amateur-built Flying Flea HM14/360, N83165, was substantially damaged during a forced landing after takeoff from Waterbury Airport (N41), Plymouth, Connecticut. The private pilot was seriously injured. The personal flight was conducted under the provisions of Title 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed, and no flight plan was filed for the flight, which originated from N41, about 1630.According to witnesses, the pilot was conducting touch-and-go landings. After about 30 minutes, the engine "sputtered" multiple times and the airplane subsequently descended into trees. The pilot was hospitalized, and according to his wife, he did not recall the accident. Examination of the airplane by a Federal Aviation Administration inspector revealed that both wings separated from the fuselage. The airplane was equipped with a BMW R100 motorcycle engine. An undetermined amount of fuel was observed in the fuel tank and examination of the fuel system did not reveal any fuel contamination. An examination of the airframe did not reveal any anomalies and no further examination of the engine was performed.