Date & Time: May 13, 1991 at 1319 LT
Type of aircraft:
Cessna 207 Skywagon/Stationair
Charter/Taxi (Non Scheduled Revenue Flight)
Grand Canyon - Grand Canyon
United States of America
Crew on board:
Pax on board:
Captain / Total hours on type:
The airplane crashed into a wooded area about 8 minutes after takeoff. Evidence at the wreckage site revealed that the airplane crashed through the trees at a glide angle of 8°. The glide angle for a power-off forced landing is 6° according to the pilot's operating handbook. The propeller did not exhibit rotational damage. Engine teardown revealed that the #1 cylinder had catastrophic detonation. All seven occupants were killed, among them two British, two German and two Swiss tourists, and the US pilot.
Detonation (or pre-ignition) in the n°1 cylinder, which resulted in erosion (burning) of the n°1 piston and subsequent loss of engine power. A factor related to the accident was: the lack of suitable terrain for an emergency landing.