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ASN Wikibase Occurrence # 74401
Last updated: 18 November 2021
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Date:18-MAY-2010
Time:16:30
Type:Silhouette image of generic SS2T model; specific model in this crash may look slightly different
Ayres S-2R-T34 Turbo Thrush
Owner/operator:Alaska Air Service LLC
Registration: N29254
MSN: R1340-008DC
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Category:Accident
Location:Near Ord Bend, CA -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Agricultural
Departure airport:Hamilton City, CA (PVT)
Destination airport:Hamilton City, CA (PVT)
Investigating agency: NTSB
Narrative:
While on approach to spray a field, the pilot observed smoke emanating from the engine compartment. He set up for an emergency landing to a road. During the landing roll, the airplane veered off the road and struck power poles. During a postaccident examination of the engine, no mechanical anomalies were found that would have precluded normal operation. The manufacturer noted that the overall condition of the engine exhibited corrosion and heat erosion. The fuel nozzles were covered in a soot and soil combination. When flow tested, the fuel nozzles exceeded the parameters in the component maintenance manual test procedures. The manufacturer stated that the out-of-limit condition may cause hot-section deterioration over time but would not have prevented normal engine operation. The compressor turbine guide vane ring was examined, and blade fractures from overstress were found, along with chipping and flaking of the coating adjacent to the fracture surfaces.
Probable Cause: Loss of engine power for reasons that could not be determined because postaccident examination of the airframe and engine did not reveal any anomalies that would have precluded normal operation.

Sources:

NTSB

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years and 4 months
Download report: Final report
Location


Revision history:

Date/timeContributorUpdates
18-May-2010 20:09 RobertMB Added
18-May-2010 22:48 RobertMB Updated [Source]
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
26-Nov-2017 17:52 ASN Update Bot Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative]

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