ASN Wikibase Occurrence # 43771
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| Date: | 28-MAY-2007 |
| Time: | 13:40 |
| Type: |  Hughes 500D (369D) |
| Owner/operator: | Haverfield Corporation |
| Registration: | N765HV |
| MSN: | 310904D |
| Fatalities: | Fatalities: 1 / Occupants: 3 |
| Aircraft damage: | Written off (damaged beyond repair) |
| Category: | Accident |
| Location: | Columbus, MT -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | SU |
| Departure airport: | Billings, MT (KBIL) |
| Billings, MT (KBIL) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During a stable hover about 120 feet above ground level for the purpose of visually inspecting a power line support structure, the helicopter had a complete loss of engine power. The pilot's maneuvering options were limited by the support structure, and he attempted an autorotation to a forced landing. During that sequence of events the helicopter collided with terrain. The investigation determined that the engine's fuel nozzle was supplying a nonuniform fuel spray, leading to a localized over-temperature in the turbine section, which lead to turbine blade rub, the eventual fatigue separation of a second stage turbine blade, and the loss of engine power.
Probable Cause: The fatigue failure of a turbine blade due to a localized over-temperature of the turbine section as result of a non-uniform fuel distribution by the fuel nozzle. Contributing to the accident was the close proximity of a power line support structure which restricted maneuverability for a successful autorotation.
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20070612X00715&key=1
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Oct-2008 00:45 | ASN archive | Added |
| 21-Dec-2016 19:24 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 04-Dec-2017 18:37 | ASN Update Bot | Updated [Other fatalities, Source, Narrative] |
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