ASN Wikibase Occurrence # 46135
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| Date: | Thursday 30 October 2008 |
| Time: | 10:45 |
| Type: |  Hughes 369D |
| Owner/operator: | Aerial Solutions, Inc. |
| Registration: | N606AS |
| MSN: | 510987D |
| Year of manufacture: | 1981 |
| Total airframe hrs: | 14020 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Monongahela, PA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | Carroll Twnshp, PA |
| Carroll Twnshp, PA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter was performing low-level external-load (saw) tree trimming operations when the engine lost power and the helicopter subsequently descended into trees and terrain. Detailed examination of the engine revealed evidence of an improper assembly of the compressor discharge tubes to the combustion liner, and evidence of an improper interim repair. Further metallurgical examination of the combustion section revealed evidence of non-uniform combustion patterns, and a subsequent distortion of the materials, which ultimately resulted in rubbing of the first stage turbine wheel and failure of a turbine blade in high cycle fatigue.
Probable Cause: A total loss of engine power due to the improper assembly of the compressor discharge tubes to the combustion liner.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 31-Oct-2008 11:26 | harro | Updated |
| 21-Dec-2016 19:24 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 03-Dec-2017 12:07 | ASN Update Bot | Updated [Operator, Total fatalities, Total occupants, Nature, Departure airport, Destination airport, Source, Narrative] |
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