ERA10LA105 · Cessna 172S

The pilot was attempting an instrument flight rules (IFR) transoceanic ferry flight in a new Cessna 172S. The flight had been delayed several days due to weather, and the pilot was anxious to return home to the United Kingdom, as his daughter was having surgery. The airplane was equipped with an approved auxiliary fuel tank, which resulted in a gross weight that was 30 percent higher than the published maximum gross weight for the airplane. The higher gross weight was also approved under a special airworthiness certificate; however, the operating limitations for that certificate included, "15. Avoid moderate to severe turbulence." Additionally, the pilot contacted a flight service station and was aware of airmen's meteorological information (AIRMET)s for IFR conditions, moderate turbulence below 11,000 feet, and moderate ice below 13,000 feet, with the freezing level ranging between the surface and 2,500 feet. All three AIRMETS were in effect at the time of departure and the pilot was also aware of cloud and precipitation locations. The airplane flew about 25 miles northeast of the departure airport, then reversed course when the pilot could no longer maintain an altitude of 6,000 feet mean sea level (msl) and was having difficulty controlling the airplane in turbulence and icing conditions. The airplane flew approximately 7 miles after the course reversal, descending to 1,200 feet msl, until radar contact was lost. A witness reported that the airplane flew overhead about 100 to 200 feet above ground level, with continuous engine noise, until it impacted a river. Examination of the wreckage did not reveal any preimpact mechanical malfunctions. Light snow and drizzle prevailed at the time of departure.

Verbatim NTSB analysis and probable cause from the NTSB dataset