What happened
While executing a VHF Omni Range (VOR) instrument approach toward its destination, the aircraft began a descent after passing the VOR station at 2,800 feet. Radar tracking showed that the aircraft initially turned right, establishing a magnetic course of approximately 017 degrees, which deviated significantly from the published final approach course of 341 degrees. Following this deviation, the aircraft entered a series of alternating left and right turns.
During this period of unstable flight, the aircraft descended through 2,000 feet and reached a minimum altitude of 1,400 feet. The final radar contact recorded the aircraft at 1,600 feet. The impact occurred at an elevation of approximately 1,235 feet, roughly 0.18 nautical miles from the last tracked position. Notably, the aircraft descended below the minimum descent altitude of 1,720 feet required for the approach procedure.
Findings
Investigation into the environmental conditions revealed that the area was subject to moderate turbulence and low-level wind shear. Furthermore, data indicated that the aircraft likely encountered severe icing conditions while descending and approaching the airport. Although the pilot had received a preflight briefing that included advisories for moderate icing and turbulence, as well as specific pilot reports regarding these hazards, the severity of the conditions may have exceeded the initial briefing. A post-accident examination of the engines and airframe showed no evidence of mechanical failure or malfunction prior to the impact.