On August 3, 2001, a Cessna 207 (registration N9794M) operated by Denali Air Taxi, Inc. was involved in an aviation accident near Healy, AK. Investigators recorded the probable cause as: The pilot's continued flight into adverse weather conditions after becoming lost/disoriented. Factors in the accident were rising terrain, a blind/box canyon, low clouds, and rain. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A commercial pilot flying in a two-aircraft flight became disoriented in mountainous terrain after losing visual contact, encountered rain and low ceilings, then turned into a narrowing valley and collided with rising terrain, resulting in substantial aircraft damage.
Accident Details
A certificated commercial pilot was operating the second airplane in a flight of two airplanes within an area of mountainous terrain. Shortly after takeoff, the pilot lost sight of the first airplane but was able to maintain radio contact. As the flight progressed, rain began to fall, accompanied by diminished visibility and low ceilings. The pilot then became disoriented to his exact position and mistakenly turned into a small valley.
Events Leading to Collision
The pilot reported that once he entered the valley, the terrain began to rise, prompting him to initiate a climb. The valley became too narrow to turn around, and clouds began to close around the airplane as he continued climbing. As the terrain continued to rise, the pilot noticed his airspeed was decreasing. Shortly thereafter, the airplane collided with rising terrain, sustaining substantial damage.