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ASN Wikibase Occurrence # 145700
Last updated: 9 December 2020
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Type:Silhouette image of generic GLAS model; specific model in this crash may look slightly different
Glasair III
Registration: N471B
C/n / msn: 3380
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Location:Mile marker 1.2, West Fork Road, south of Darby, MT -   United States of America
Phase: Landing
Departure airport:Troutdale, OR (TTD)
Destination airport:Billings, MT (BIL)
Investigating agency: NTSB
The pilot reported that, about 2 hours into a visual flight rules cross-country flight, he enriched the mixture due to indications of excessive cylinder head and exhaust gas temperatures. This resulted in a higher fuel burn than planned, so he changed the flightís destination to a closer airport. While en route to his amended destination, he encountered instrument meteorological conditions. A subsequent buildup of ice resulted in a loss of 100 knots of airspeed as the airplane entered a controlled descent. The pilot executed a 180-degree turn and broke out of the clouds over a valley. During the next 50 minutes, he made several attempts to exit the valley; however, mountain peak obscuration and a thunderstorm prevented him from flying out of the valley. Now very close to fuel exhaustion, he elected to land on a two-lane highway. During the landing roll, the airplane veered off the side of the road, impacted a tree, slid backwards through a ditch, and collided with a concrete drainage culvert. The airplane sustained damage to the outboard sections of both wings.
Probable Cause: The pilotís loss of directional control during an emergency landing on a paved highway.



Revision history:

18-May-2012 10:47 Geno Added
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
19-Aug-2017 16:04 ASN Update Bot Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative]

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