Christen Industries A-1 accident near Loa, Utah, June 1, 2007

The NTSB's narrative final · quoted from the NTSB record

The pilot and gunner were participating in a low-level, aerial predatory control operation. They were operating over terrain that was approximately 8,300 feet above mean sea level. While maneuvering in a turn at slow airspeed to make an additional pass over an area with coyotes, the airplane impacted the ground with the right wing tip, and then came to rest inverted. A witness, who was working with the pilot from the ground, was in a drainage wash while the airplane circled overhead. They had just identified a coyote den and there were coyotes traversing up and down the wash. The airplane went out of the witness's view, and then the witness heard the impact of the airplane with the ground. No evidence of any preimpact mechanical anomalies was discovered. Weight and balance calculations showed that the airplane was out of its aft center of gravity limits by 1.6 inches, which would result in less stable flight characteristics, especially during slow flight. Previous accidents involving similar flight regimes have been associated with wake vortices encounters. Although it is possible that the airplane encountered its own wake vortices, this could not be determined with the available evidence. Based on standard atmospheric conditions and the temperatures at the closest reporting stations, the density altitude would have been about 10,000 feet.

The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.