What happened
The pilot was attempting to navigate an aircraft within the confines of a volcanic crater, specifically flying around a lava dome situated at an elevation above 6000 feet mean sea level. The aircraft in question was equipped with a relatively low-output engine rated at only 75 horsepower. As the aircraft entered the crater from the northeast, it encountered high winds that flowed across the lava dome. These wind conditions generated significant downdrafts that exceeded the climb capability of the small aircraft. Unable to maintain altitude or escape the sinking air mass, the aircraft became trapped within the crater environment.
The investigation
The primary factor identified was the aerodynamic interaction between the high winds and the topography of the lava dome. The specific geometry of the crater created a downdraft that the 75-horsepower engine could not overcome. This mechanical limitation of the aircraft's power-to-weight ratio, combined with the extreme weather conditions inside the crater, rendered escape impossible under the prevailing circumstances.
Findings
The incident highlights the dangers of flying low-powered aircraft in complex terrain with unpredictable weather patterns. The downdrafts created by winds flowing over the lava dome were the critical environmental factor. The pilot's decision to fly into this specific topographic feature resulted in the aircraft being unable to outclimb the descending air. Both occupants survived the ordeal and were rescued the following day.