Accident Overview
Aircraft N4877V was on a visual approach to Clarion County Airport around 2100 hours when it crashed in a wooded area southwest of the field. The pilot, the only person on board, was killed. Marginal visual weather conditions prevailed at the time of the accident.
Sequence of Events
Another pilot waiting on the ground observed N4877V through a break in the clouds as it turned left to the southwest, appearing to establish a left downwind for runway 05. The aircraft subsequently impacted terrain in a nose-low attitude. The wreckage was confined to an area consistent with a stall-type accident.
Investigation Findings
Examination of the wreckage revealed no malfunctions or system failures. The official investigation identified the following factors: weather conditions including clouds and snow; a dark night environment; the pilot's inadequate evaluation of the weather; intentional flight into instrument meteorological conditions while operating under visual flight rules; failure to follow VFR procedures; spatial disorientation; and an inadvertent stall. The aircraft struck trees during the uncontrolled descent.
Probable Cause
The probable cause of the accident was the pilot's decision to continue VFR flight into instrument meteorological conditions, compounded by spatial disorientation that led to an inadvertent stall. Contributing factors included inadequate weather evaluation and non-adherence to VFR procedures.