Primary finding
Probable cause
The pilot's selection of an inadequate altitude to enter a box canyon, which resulted in an in-flight collision with terrain.
Investigator assessment
Analysis narrative
The pilot said that he was flying the airplane about 8,500 feet msl on an eastbound heading. He entered a canyon, and not believing he had sufficient clearance to cross over the ridge, began a 360-degree turn to gain altitude. During the turn the pilot reported feeling the airplane sink; he then attempted to guide the airplane westbound down the canyon and away from terrain. The airplane continued to descend and impacted terrain at the 8,300-foot level. The pilot said that he did not perceive any preimpact mechanical malfunction or failure.
Source record
Factual narrative
The pilot of the Bellanca 7GCBC reported flying the airplane about 8,500 feet msl on an eastbound heading. He entered a canyon, and not believing he had sufficient clearance to cross over the ridge, began a 360-degree turn to gain altitude. During the turn the pilot reported feeling the airplane sink; he then attempted to guide the airplane westbound down the canyon and away from terrain. The airplane continued to descend and impacted terrain at the 8,300-foot level.