Accident Bell 47G-3B-2 N1461W, Wednesday 14 January 1998
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Date:Wednesday 14 January 1998
Time:15:00 LT
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
Engine model:Lycoming TVO-435-G1A
Fatalities:Fatalities: 1 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Location:Spanish Fork, UT -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Departure airport:, UT (U77)
Destination airport:
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
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.

Probable Cause: A total loss of power due to repeated engine overspeeds. A related factor was unsuitable terrain.

Accident investigation:
Investigating agency: NTSB
Report number: FTW98GA097
Status: Investigation completed
Duration: 1 year and 8 months
Download report: Final report




Revision history:

24-Oct-2008 10:30 ASN archive Added
21-Dec-2016 19:24 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
07-Apr-2024 15:03 ASN Update Bot Updated [Time, Other fatalities, Departure airport, Source, Narrative, Category, Accident report]

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