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ASN Wikibase Occurrence # 46135
Last updated: 29 May 2020
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Date:30-OCT-2008
Time:10:45
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
C/n / msn: 510987D
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Category:Accident
Location:Monongahela, PA -   United States of America
Phase: Unknown
Nature:Unknown
Departure airport:Carroll Twnshp, PA
Destination airport:Carroll Twnshp, PA
Investigating agency: NTSB
Narrative:
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.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20081030X12821&key=1


Revision history:

Date/timeContributorUpdates
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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