What happened
The crew departed from Calgary Airport to conduct a training exercise. During the flight, the pilot engaged in unauthorized low-level maneuvers that led to the aircraft becoming trapped in a dead-end canyon on Mount McDougall. While attempting to turn around at the western end of the canyon, the airplane struck trees. The impact tore off the starboard horizontal stabilizer, causing the aircraft to crash onto the mountain slope approximately 71 kilometers west-southwest of Calgary.
The accident resulted in two fatalities and one serious injury among the crew members on board.