Accident Overview
The unregistered airplane was observed flying over the airstrip from the southwest at an altitude of 200-300 feet above ground level. It then initiated a left turn, intended as a base turn toward the west threshold of the airstrip. The turn progressed into a steep spiral descent, and the airplane impacted the ground in a near-vertical attitude.
Environmental Conditions
At the time of the accident, the wind was from the west at approximately 30 miles per hour.
Aircraft Configuration
The airplane was equipped with 32x15 balloon tundra tires. The source states there is no data relating to an evaluation of the airplane's flight performance and handling envelope with these tires installed.
Documentation Status
The airplane had no registration, flight manual, weight and balance record, or FAA Form 337 for its complete rebuild after it was reported destroyed in 1989. Additionally, there were insufficient Supplemental Type Certificates (STC) or FAA field approval documents for modifications.
Weight and Safety Equipment
The airplane was at least 117 pounds over its maximum gross weight. Shoulder harnesses were not installed.