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ASN Wikibase Occurrence # 146275
Last updated: 16 November 2021
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Type:Silhouette image of generic SS2T model; specific model in this crash may look slightly different
Ayres S-2R-G6 Turbo Thrush
Owner/operator:Sky Aviation
Registration: N70WY
MSN: G6-127
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Location:Riverton Regional Airport - KRIW, Riverton, WY -   United States of America
Phase: Landing
Departure airport:Riverton, WY
Destination airport:Riverton, WY (RIW)
Investigating agency: NTSB
The pilot reported that, shortly after departure, he observed the torque and temperature gauges move to extremely high values. The engine did not respond to speed or power lever inputs; however, the pilot reported that the linkage and amount of travel of the controls felt normal. The pilot diverted to a nearby airport and, when the airplane was lined up for landing on the runway, he shut down the engine. The pilot reported that, during the final descent, the airplane encountered a downdraft and collided with a light. Subsequently, the pilot was unable to maintain the airplane on an adequate descent glidepath, and it touched down in the dirt short of the runway.
Postaccident examination of the engine revealed no mechanical anomalies that would have precluded normal operation. Examination of the fuel control unit revealed several anomalies within the unit; however, none of those anomalies would have resulted in the reported engine overspeed condition.

Probable Cause: An engine overspeed shortly after takeoff for reasons that could not be determined because postaccident examination revealed no mechanical malfunctions or failures that would have precluded normal operation.



Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 3 years and 4 months
Download report: Final report

Revision history:

12-Jun-2012 16:19 Geno Added
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
27-Nov-2017 20:44 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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