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ASN Wikibase Occurrence # 17525
Last updated: 25 July 2020
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Type:Silhouette image of generic GLAS model; specific model in this crash may look slightly different
Glasair III
Registration: C-GGTM
C/n / msn: 3262
Fatalities:Fatalities: 1 / Occupants: 1
Aircraft damage: Substantial
Location:near Cheyenne, Wyoming -   United States of America
Phase: En route
Departure airport:Greybull, WY (KGEY)
Destination airport:Larned, KS (KLQR)
Investigating agency: NTSB
The non instrument-rated private pilot departed under visual flight rules (VFR) for a planned cross country flight over mountainous terrain. During the cruise phase of the flight, the pilot was receiving radar flight following service. As the flight progressed, due to clouds, the pilot requested a lower altitude from the air traffic controller who was working the flight. Radar data showed that the airplane descended from the original cruise altitude, then performed a series of turns while continuing to descend prior to radar contact being lost. A witness located adjacent to the accident site reported hearing an airplane fly overhead at a low altitude followed by the sounds of the airplane impacting the ground. The witness added that at the time he heard the airplane fly over, visibility was around 100 to 150 feet with near "whiteout" conditions due to heavy snow falling. Examination of the airframe and engine revealed no mechanical anomalies.
Probable Cause: The pilot's improper decision to continue VFR flight into instrument meteorological weather conditions. Contributing to the accident were low ceilings, snow and whiteout conditions.




Photo of C-GGTM courtesy

Vernon (CYVK / YVE)
7 April 2007; (c) John Olafson

Revision history:

22-Apr-2008 11:58 Fusko Added
21-Dec-2016 19:14 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:16 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:20 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
03-Dec-2017 10:44 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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