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ASN Wikibase Occurrence # 137704
Last updated: 22 November 2019
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Date:25-JUL-2011
Time:14:38
Type:Silhouette image of generic S55P model; specific model in this crash may look slightly different
Sikorsky S-55B
Owner/operator:Golden Wings Aviation
Registration: N5663
C/n / msn: 55-1267
Fatalities:Fatalities: 1 / Occupants: 1
Aircraft damage: Substantial
Category:Accident
Location:Between Chelan and Manson, WA -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Agricultural
Departure airport:Chelan, WA
Destination airport:Chelan, WA
Investigating agency: NTSB
Narrative:
The helicopter was contracted to overfly the rural cherry orchard in order to dry the cherries following rain showers. A witness reported that the helicopter was flying over the cherry orchard from south to north, and it had just completed a left turn when it collided with power lines that bordered the orchard. The helicopter impacted terrain, in a nose low attitude, about 45 feet south of the power lines. Power line wires were found wrapped 3 to 4 times around the main rotor mast and striation marks on the leading edge of the main rotor blades were indicative of a wire strike.

Examination of the accident site revealed that four wires were strung between poles with the top three wires about 50 feet agl and the lower wire about 40 feet agl. Postaccident examination of the airframe and engine revealed no evidence of a preimpact mechanical malfunction or failure that would have precluded normal operation.
Probable Cause: The pilotís failure to maintain clearance from power lines while maneuvering at a low altitude.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20110725X05443&key=1


Revision history:

Date/timeContributorUpdates
26-Jul-2011 00:07 gerard57 Added
26-Jul-2011 02:28 RobertMB Updated [Time, Aircraft type, Registration, Operator, Location, Source, Narrative]
26-Jul-2011 07:55 RobertMB Updated [Aircraft type, Registration, Cn, Operator, Other fatalities]
21-Dec-2016 19:26 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
27-Nov-2017 16:59 ASN Update Bot Updated [Cn, Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative, Plane category]

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