Accident Bell 47G-3B-2 N1461W,
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ASN Wikibase Occurrence # 42599
 
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Date:Wednesday 14 January 1998
Time:13:00
Type:Silhouette image of generic B47G model; specific model in this crash may look slightly different    
Bell 47G-3B-2
Owner/operator:Skyhawk Helicopter Service
Registration: N1461W
MSN: 6733
Year of manufacture:1969
Total airframe hrs:8141 hours
Fatalities:Fatalities: 1 / Occupants: 2
Aircraft damage: Substantial
Category:Accident
Location:Spanish Fork, UT -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Unknown
Departure airport:UT (U77)
Destination airport:
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
While maneuvering at low level during a coyote hunting operation, a total loss of engine power occurred and the helicopter collided with trees during a forced landing to unsuitable terrain. Examination of the engine provided evidence of partial failure and/or total failure of the valve assemblies in all cylinders. Laboratory analysis revealed evidence of progressive failure in the valve seats. This was indicative of repeated overspeed of the engine. CAUSE: A total loss of power due to repeated engine overspeeds. A related factor was unsuitable terrain.

Sources:

NTSB: http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001211X09424

Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
21-Dec-2016 19:24 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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