Accident Summary
A private pilot conducting a visual flight rules (VFR) night flight crashed approximately 9 miles from the departure airport over a sparsely populated area. The wreckage and impact signatures were consistent with a steep-angle, high-speed descent. No evidence of mechanical malfunction was observed during the investigation.
Weather and Environmental Conditions
Weather conditions at the time included mid to high-level cloud coverage, with a broken ceiling at 2,200 feet above ground level and an overcast layer at 3,400 feet above ground level. The moon was in a waning crescent phase with 11 percent of its visible disk illuminated. Analysis by a Safety Board senior meteorologist revealed that the moon was below the horizon at the accident time and would have been further obscured by the existing cloud cover.
Spatial Disorientation Considerations
According to FAA Advisory Circular (AC) 60-4A "Pilot's Spatial Disorientation," surface references and the natural horizon may become obscured even when visibility meets VFR minimums. The advisory notes the lack of natural horizon or surface reference is common, particularly at night in extremely sparsely populated areas or in low visibility conditions. It warns that a sloping cloud formation, an obscured horizon, a dark scene with ground lights and stars, and certain geometric patterns of ground lights can provide inaccurate visual cues, potentially leading a disoriented pilot to place the aircraft in a dangerous attitude.