At approximately 09:30 mountain time, a Cessna 175 crashed while maneuvering about 17 miles east of Hanksville, killing the pilot and seriously injuring the two passengers. One passenger said the airplane approached a bluff where several cowboys waited. The intention was to drop a message to them, indicating the whereabouts of stray cattle. The airplane suddenly sank, like we hit a downdraft, and the pilot banked right to avoid the bluff. The airplane encountered another downdraft and collided with terrain.