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ASN Wikibase Occurrence # 48514
Last updated: 5 May 2020
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Type:Silhouette image of generic C170 model; specific model in this crash may look slightly different
Cessna 170B
Owner/operator:Craig T Weaver
Registration: N8387N
C/n / msn: 25239
Fatalities:Fatalities: 1 / Occupants: 3
Aircraft damage: Substantial
Location:12 nm NW of Hanna, UT -   United States of America
Phase: En route
Departure airport:Salt Lake City, UT (SLC)
Destination airport:Rifle, CO (RIL)
Investigating agency: NTSB
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.
Probable Cause: The flight's encounter with adverse tailwinds and downdrafts in mountainous terrain that exceeded the airplane's climb capability.




(c) NTSB

Revision history:

25-Nov-2008 10:58 JINX Updated
08-Jun-2009 12:17 harro Updated
03-Dec-2017 13:09 ASN Update Bot Updated [Time, Cn, Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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