NTSB Identification: WPR09LA043
14 CFR Part 91: General Aviation
Accident occurred Friday, November 21, 2008 in Hanna, UT
Probable Cause Approval Date: 08/13/2009
Aircraft: CESSNA 170B, registration: N8387N
Injuries: 1 Fatal,2 Serious.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
The pilot checked the weather forecast twice prior to departing on the cross-country flight, with both reports indicating that visual flight rule (VFR) conditions would prevail. The pilot stated that after taking off and climbing to an altitude of 10,500 feet mean sea level (msl), he was able to survey the approaching mountain and its summit, and initiate a rate of climb that would clear the terrain. As the flight approached the mountain, the flight encountered increasing tailwinds that reduced the effective altitude gain over distance traveled to an amount insufficient to clear the terrain. The pilot reported that as the mountain range approached he encountered unusually strong downdrafts in relation to terrain contours leading to the summit. The pilot further stated, "...we also began experiencing a loss in altitude, speed, and rate of climb, as well as increasingly adverse terrain, causing our speed to become too slow for a safe turn without further loss of control or altitude with the increasing elevation." As the airplane was losing altitude, the pilot elected to pick out a clearing to make a forced landing, as the airspeed was too low for an evasive maneuver. The airplane impacted terrain in a snow-covered clearing at an elevation of 9,800 feet msl, coming to rest upright in an open meadow surrounded by mountainous terrain about 150 feet from the initial touchdown point. The airplane sustained substantial damage to both wings and fuselage. The pilot reported no mechanical failures or malfunctions with the airplane at the time of the accident.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The flight's encounter with adverse tailwinds and downdrafts in mountainous terrain that exceeded the airplane's climb capability. Full narrative available
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