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ASN Wikibase Occurrence # 45518
Last updated: 19 November 2019
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Type:Silhouette image of generic UH1 model; specific model in this crash may look slightly different
Bell UH-1H Iroquois
Owner/operator:Northwest Helicopters
Registration: N114DR
C/n / msn: 66-792
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Location:Clark Fork , ID -   United States of America
Phase: Initial climb
Departure airport:Clark Fork, ID
Destination airport:Clark Fork, ID
Investigating agency: NTSB
The commercial pilot was conducting long-line logging operations in a restricted category helicopter when witnesses heard what they described as a loud bang. A witness reported that the pilot had just released the fifth load of logs for the morning and was maneuvering, in a turn, and ascending up the hill. As the helicopter ascended, the witness heard the loud bang. Concurrent with the loud bang, the witness stated that he observed pieces of the helicopter, from the area of the tail boom, flying through the air. The helicopter then yawed to the left, just before impacting terrain in a nose low attitude. A search of the surrounding area located several pieces of the tail rotor assembly. The tail rotor blades, yoke assembly, pitch change links, a portion of the slider, crosshead and the distal end of the control shaft were located, as a unit, near the main wreckage. However, the splined barrel portion of the slider, the tail rotor static stop, tail rotor input shaft and tail rotor retaining nut were not found. Detailed examination of the remains of the tail rotor slider assembly revealed that the tail rotor slider lugs had fractured as a result of fatigue; however, because the condition of the missing components is unknown, it could not be determined if the fractured slider assembly was the primary failure of the tail rotor assembly.
Probable Cause: A failure of unknown origin in the tail rotor drive assembly. Factors include mountainous terrain unsuitable for an emergency landing.



Revision history:

28-Oct-2008 00:45 ASN archive Added
21-Dec-2016 19:24 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
09-Dec-2017 16:48 ASN Update Bot Updated [Departure airport, Destination airport, Source, Narrative]

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