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ASN Wikibase Occurrence # 169254
Last updated: 21 August 2018
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Date:11-AUG-2014
Time:11:30 LT
Type:Silhouette image of generic H269 model; specific model in this crash may look slightly different
Hughes 269C
Owner/operator:Private
Registration: N7432F
C/n / msn: 160458
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Written off (damaged beyond repair)
Location:near Darrington, WA -   United States of America
Phase: En route
Nature:Private
Departure airport:Snohomish, WA (S43)
Destination airport:Snohomish, WA (S43)
Narrative:
The commercial pilot was conducting a local, personal flight in the rented helicopter. The pilot reported that, while descending the helicopter from 5,000 ft and approaching 4,000 ft, he increased the collective and noticed that the engine was slowing down; he was unable to recover the engine rpm to a normal range. The helicopter continued to descend until the pilot entered an autorotation. The helicopter then impacted a tree and came to rest in a small stream. The pilot stated that he did not believe that the engine ever quit but that it did not produce enough power to continue flight.
Postaccident examination of the helicopter revealed that the throttle mount bracket was hanging by the throttle cable linkage and was not secured to the servo mount studs, which would have led to the loss of throttle movement for acceleration. The operator stated that the engine had been installed in the helicopter 10 flight hours before the accident. It is likely that maintenance personnel did not properly secure the throttle mount bracket during the engine installation, which led to the loss of throttle movement and inability to control engine power.

Probable Cause: Maintenance personnelís failure to secure the throttle mount bracket during a recent engine installation, which resulted in the loss of throttle movement and an inability to control engine power.

Sources:

https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20140811X32733&key=1
http://aerossurance.com/helicopters/throttle-maintenance-error/


Revision history:

Date/timeContributorUpdates
28-Aug-2014 05:45 Aerossurance Added
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
05-Nov-2017 08:47 ASN Update Bot Updated [Cn, Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]
07-May-2018 19:15 Aerossurance Updated [Time, Location, Source, Damage]

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