Accident Hughes 369D N606AS, 30 Oct 2008
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ASN Wikibase Occurrence # 46135
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Type:Silhouette image of generic H500 model; specific model in this crash may look slightly different    
Hughes 369D
Owner/operator:Aerial Solutions, Inc.
Registration: N606AS
MSN: 510987D
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Location:Monongahela, PA -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Departure airport:Carroll Twnshp, PA
Destination airport: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:
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 11 months
Download report: Final report

Revision history:

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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