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ASN Wikibase Occurrence # 45992
Last updated: 17 February 2020
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Type:Silhouette image of generic BE35 model; specific model in this crash may look slightly different
Beechcraft V35B Bonanza
Registration: N4637M
C/n / msn: D-10147
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Green River, UT -   United States of America
Phase: En route
Departure airport:Gunnison, CO (GUC)
Destination airport:Fresno, CA (FAT)
Investigating agency: NTSB
The pilot had been skiing in the Rocky Mountains (elevation 8,900 feet) for a week. He departed in his non-pressurized single-engine airplane and climbed up to 21,600 feet; he had no supplemental oxygen onboard. Approximately 1 hour 45 minutes into the flight, the airplane reached a maximum altitude of 22,100 feet before entering a rapid descent. The airplane impacted mountainous terrain in an uncontrolled spin. Examination of the airplane and engine revealed no evidence of any pre-impact discrepancies. The Emergency Locator Transmitter (ELT) functioned properly, and the airplane was located by the Civil Air Patrol the following day.
Probable Cause: the pilot's failure to maintain aircraft control as a result of incapacitation (from hypoxia) due to the in-flight decision to fly at altitudes where oxygen is required, without oxygen available.



Revision history:

28-Oct-2008 00:45 ASN archive Added
21-Dec-2016 19:24 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
10-Dec-2017 10:33 ASN Update Bot Updated [Source, Narrative]

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