ASN Wikibase Occurrence # 278899
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| Date: | Sunday 13 October 2019 |
| Time: | 17:00 LT |
| Type: | Hiller UH-12E Soloy |
| Owner/operator: | |
| Registration: | N131HA |
| MSN: | HA3031 |
| Year of manufacture: | 1975 |
| Total airframe hrs: | 12078 hours |
| Engine model: | Rolls-Royce 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Susanville, California -
 United States of America
|
| Phase: | Landing |
| Nature: | Agricultural |
| Departure airport: | Susanville, CA |
| Susanville, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While operating over steep, logged forest terrain, the helicopter experienced multiple compressor stalls followed by a partial loss of power. The pilot attempted to regain engine power; however, once he determined that was not possible, he initiated a forced landing on the sloping terrain. The main rotor blades impacted terrain and the helicopter rolled over onto its left side, which resulted in substantial damage to main rotor system, fuselage, and the tail boom.
A postaccident examination of the engine revealed damage to the stage 1, 2, and 3 turbine wheels, which exhibited cracks that were consistent with multiple over-temperature operations and a hot start event. Additionally, examination of the turbine outlet temperature gauge revealed errors that registered higher than the test temperature and are most likely not causal to the over temperature and hot start events. Review of maintenance documents revealed no indication of any previous hot start events or over temperature operations.
Probable Cause: A partial loss of engine power due to multiple overtemperature events and a hot start event, which resulted in thermally damaged internal components of the engine. Contributing to the accident was the lack of suitable terrain on which to perform the forced landing.
Accident investigation:
 |
|
Sources:
NTSB WPR20LA007
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 05-Jun-2022 10:44 | ASN Update Bot | Added |
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