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ASN Wikibase Occurrence # 30204
Last updated: 24 September 2019
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Type:Silhouette image of generic UH1 model; specific model in this crash may look slightly different
Bell UH-1B
Owner/operator:Precision Air, Llc
Registration: N50330
C/n / msn: 62-2078
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:15 mi NW of Price, UT -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Departure airport:Helper, UT (NONE)
Destination airport:
Investigating agency: NTSB
As the helicopter approached logging personnel with a 150 foot long line, the pilot heard a 'Shhhh' sound and was advised smoke was coming from the engine. He turned and proceeded down the mountain. The engine then 'quit.' The helicopter collided with heavily wooded steep terrain. The number 1 and 2 bearings were submitted for metallurgical examination. The metallurgical report stated that 'the most likely cause of [the] engine malfunction was degradation of the Position #1 bearing due to insufficient lubrication.' All other damage appeared to be 'secondary.' The accessory carrier assembly was oil flow tested and found to be 'acceptable,' albeit 'near the lower end of requirements.' Debris in the bearing oil strainer was believed to be 'coked oil and epoxy hardener, both unusual for this area of the engine.'
Probable Cause: Total failure of the number 1 bearing due to lack of lubrication, the oil flow being restricted by a foreign object (epoxy hardener). Factors were trees and the unavailability of suitable terrain for a forced landing.



Revision history:

27-Sep-2008 01:00 ASN archive Added
21-Dec-2016 19:16 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:20 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
07-Nov-2017 13:49 TB Updated [Total fatalities, Total occupants, Other fatalities, Location, Country, Phase, Nature, Source, Narrative]
12-Dec-2017 18:34 ASN Update Bot Updated [Cn, Operator, Nature, Departure airport, Source, Narrative]

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