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ASN Wikibase Occurrence # 188950
Last updated: 10 February 2020
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Date:17-JUL-2016
Time:14:09
Type:Silhouette image of generic UH1 model; specific model in this crash may look slightly different
Bell UH-1H Huey
Owner/operator:King County Sheriffs Office
Registration: N790RJ
C/n / msn: 70-16371
Fatalities:Fatalities: 0 / Occupants: 8
Aircraft damage: Substantial
Category:Accident
Location:Mt Adams, WA -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Unknown
Departure airport:Yakima, WA (YKM)
Destination airport:Mt. Adams, WA
Investigating agency: NTSB
Narrative:
The commercial pilot was conducting a public flight in the helicopter to transport two search and rescue personnel to a landing zone located in mountainous terrain at an elevation of about 7,800 ft. The pilot reported that he aborted his first approach, which was from the north, because he felt that he was using too much left pedal. On his second approach, which was from the south, the helicopter yawed right. The pilot recognized that a loss of tail rotor effectiveness was occurring. He attempted to recover control by reducing the collective and applying forward cyclic; however, the helicopter spun and impacted the ground.
The pilot reported that there were no mechanical malfunctions or failures with the helicopter that would have precluded normal operation.†It is likely that, during the landing approach, as the helicopter's airspeed dropped below effective translational lift and the pilot added power to compensate, there was insufficient left pedal to stop the resulting right yaw, and the pilot lost control of the helicopter due to a loss of tail rotor effectiveness.


Probable Cause: The pilotís failure to maintain yaw control as he slowed the helicopter during a landing approach, which resulted in the loss of helicopter control due to the loss of tail rotor effectiveness.


Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20160718X32942&key=1


Revision history:

Date/timeContributorUpdates
31-Jul-2016 08:32 Aerossurance Added
26-May-2017 18:07 Aerossurance Updated [Time, Registration, Cn, Source, Narrative]
19-Aug-2017 15:08 ASN Update Bot Updated [Time, Operator, Total occupants, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative]

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