ASN Wikibase Occurrence # 137269
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| Date: | Monday 4 July 2011 |
| Time: | 19:15 |
| Type: |  Hughes 500D (369D) |
| Owner/operator: | Soloy Helicopters LLC |
| Registration: | N315SH |
| MSN: | 1120D |
| Year of manufacture: | 1982 |
| Total airframe hrs: | 8601 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Minor |
| Category: | Incident |
| Location: | South of McGrath, AK -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | McGrath, AK (PAMC) |
| McGrath, AK (PAMC) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
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.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 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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