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ASN Wikibase Occurrence # 137269
Last updated: 25 July 2020
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Type:Silhouette image of generic H500 model; specific model in this crash may look slightly different
Hughes 500D (369D)
Owner/operator:Soloy Helicopters LLC
Registration: N315SH
C/n / msn: 1120D
Fatalities:Fatalities: 0 / Occupants: 3
Aircraft damage: Minor
Location:South of McGrath, AK -   United States of America
Phase: Landing
Departure airport:McGrath, AK (PAMC)
Destination airport:McGrath, AK (PAMC)
Investigating agency: NTSB
The pilot reported that during a descent, the helicopter's engine sound changed abruptly and was immediately followed by the engine-out audio horn, and a red engine-out annunciator light. She entered an emergency autorotation, and then selected a mostly open area that contained some trees as an emergency landing site. During the emergency landing, the main rotor blades struck several small trees as the helicopter touched down on the uneven, tundra-covered terrain. A postincident inspection revealed a fatigue fracture in the engine Pc line that provided compressed air to operate the engine governor and fuel control units. The Pc line met the metallurgical material specifications, but there was a bend in a normally straight portion of the line, which would have placed stress on the Pc line when installed. The additional stress likely resulted in the eventual fatigue failure of the line. It could not be determined how or when the bend occurred.
Probable Cause: A fatigue fracture of the governor-to-fuel control Pc line, which resulted in a partial loss of engine power.



Revision history:

06-Jul-2011 00:06 gerard57 Added
06-Jul-2011 02:01 RobertMB Updated [Aircraft type, Registration, Cn, Location, Phase, Source, Damage, Narrative]
21-Dec-2016 19:26 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
27-Nov-2017 18:10 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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