Synopsis
The flight departed after the pilots were briefed on an advancing snowstorm at the destination, hoping to arrive before the weather. While en route, they encountered instrument meteorological conditions (IMC) with snow. The pilot filed an IFR flight plan and continued.
Engine Power Loss and Emergency
Communications transcripts show that when the engine began to lose power, the pilot applied carburetor heat as a remedy, even though conditions were not conducive to carburetor ice. Power was temporarily regained. However, the engine then lost power completely, partially regained, and finally lost all power during an emergency descent.
Apparent Landing Attempt
During what appeared to be an attempted landing in an open field during the snowstorm, the right wingtip made initial contact with terrain, causing the aircraft to cartwheel before coming to a stop, sustaining additional damage. The cockpit exhibited evidence of right-to-left occupant contact with the instrument panel.
Investigation Findings
Investigation revealed that the engine induction air filter was completely blocked with impacted snow. Impacted snow and ice were also found between the cooling fins of cylinders #1 and #2, in the carburetor heat intake, and around the starter, alternator, belts, and other forward engine exterior surfaces.