ERA18LA097

The private pilot reported that, while on a 1-mile final approach for landing, about 400 ft above the ground, the engine lost total power. The pilot applied full throttle and enrichened the mixture, but only a momentary return of power occurred before the engine lost power again. The airspeed decreased and the airplane entered an aerodynamic stall and impacted a house and terrain. Postaccident examination of the airframe and engine revealed no evidence of any preimpact mechanical malfunctions or failures. The left wing fuel tank was empty, the right wing tank contained about 4 gallons of fuel, and the auxiliary tank contained just enough fuel to cover the bottom of the tank; however, there was evidence of fuel spillage at the site and the amount of fuel onboard before the accident could not be determined. Non-volatile memory data recorded during the accident flight revealed a large spike in fuel flow, followed by a 0 rpm reading, which was indicative of a total loss of engine power due to air passing through the fuel line and transducer rather than fuel. It is likely that the fuel flow to the engine was interrupted, but a postaccident examination of the engine and fuel system could not determine what caused the interruption.

On March 6, 2018, about 1430 eastern standard time, an experimental amateur-built Just Escapade, N45DC, was substantially damaged when it impacted terrain while on approach to the Palatka Municipal Airport (28J), Palatka, Florida. The private pilot and passenger sustained minor injuries. 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 Northeast Florida Regional Airport (SGJ), St. Augustine, Florida, about 1330.According to the pilot, he topped-off the airplane's fuel tanks at SGJ, took off, and then flew southbound over the St. Johns River toward 28J. After maneuvering for about one hour, he entered a mid-field downwind in the traffic pattern at 28J for runway 27. As the airplane turned onto the final approach leg of the traffic pattern, the engine lost total power. The pilot reported that he checked the fuel shutoff valve, and verified it was on, added power, and applied the engine enrichener, which produced only a momentary burst of engine power. He added that "the airplane doesn't glide very well," airspeed decreased, and it entered an aerodynamic stall, descended, and impacted the roof of a house and trees about one mile from the runway threshold. The pilot reported that the engine was running "perfect" up until the loss of engine power. The airplane came to rest in a backyard on its right side. The right wing was crushed forward and under the fuselage; the airplane's fuselage, wings, and vertical stabilizer sustained substantial damage. According to Federal Aviation Administration (FAA) airworthiness records, the two-seat, high-wing, float equipped, single-engine airplane was manufactured in 2007. It was equipped with a 100-horsepower Rotax 912ULS engine, that was controlled by a throttle lever and enrichener. The airplane was not equipped with carburetor heat. Postaccident examination of the airplane by an FAA inspector revealed that the fuel selector was found in the off position at the accident site, however, the pilot reported that after impact, he moved the fuel selector to the off position. The left-wing fuel tank was empty, and the right wing had about 3 gallons of fuel. Both tanks displayed evidence that fuel had leaked out post-impact, as an odor of fuel was present at the accident site. A red auxiliary fuel tank located behind the pilot and passenger seat was found with just enough fuel to cover the bottom of the 12-gallon tank. When examined, both carburetors displayed remnants of fuel inside their float bowls. Examination of the fuel system between the fuel tanks and the carburetors revealed the lines were clear and there were no mechanical anomalies (See Engine and Fuel System Factual Report in Docket). The airplane was equipped with a Dynon Avionics, FlightDEK-D180 Super-Bright, Electronic Flight Instrument System (EFIS) and Engine Monitoring System (EMS), whichrecorded non-volatile memory from the flight. The data revealed normal engine and flight instrument parameters throughout the flight, until about 2 minutes prior to the accident, where fuel flow momentarily dropped to 0 and then returned to 2 gallons per hour (GPH). About 50 seconds later, fuel flow increased rapidly through 8 GPH, then 13 seconds later shows 57 GPH, and peaks at 102 GPH. When the fuel flow rose to 102 GPH, rpm rapidly decreased to 0 rpm, as the airplane was about 400 ft above ground level. The rpm remained at 0 rpm for the remainder of the recording, except for a momentary 2,500 rpm reading. The airplane's airspeed and altitude rapidly decreased a few seconds after the 0 rpm reading. The impact was about 25 seconds after the first 0 rpm reading (See EFIS and EMS Data Factual Report in docket). An engine test-run was performed; the engine started with its own ignition system and original fuel. The engine produced power for a total of 2-3 minutes at different power settings. During the engine test, after the engine ran for about 30 seconds, the fuel source was removed. The engine ran for about two additional minutes without the fuel source connected, and then stopped. The Dynon FlightDEK-D180 display was also monitored during the test-run. After the fuel source was removed, the fuel flow GPH reading decreased to 2-3 GPH, then further decreased to 0.0 GPH for one or two seconds. Subsequently, GPH rapidly rose rapidly rose to 99.9 GPH and remained steady at that reading until the engine ceased running. After the engine stopped, the GPH reading continued to display 99.9 GPH for about 5 seconds, and then decreased back to 0.0 GPH. The airplane was equipped with an electronic fuel flow transducer, which measured the GPH rate of fuel passing through the fuel line via a spinning paddle. According to a transducer manufacturer, when air enters the flow transducer, the paddle wheel is free to spin at the velocity of the air that passes over the wheel, which is higher than fuel flow. According to FAA airman records, the pilot held a private pilot certificate with ratings for airplane single-engine land and sea. His most recent FAA third-class medical certificate was issued in November 2016. He reported a total flight experience of 435 hours and 169 hours in the accident make and model airplane. The weather conditions reported at Keystone Airpark (42J), Keystone Heights, Florida, 22 nautical miles from the accident site, at 1435, included a wind of 220° at 12 knots, gusting to 16 knots, visibility 10 statute miles, few clouds at 3,500 and 5,500 ft above ground level, temperature 24°C, and dew point 6°C.