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ASN Wikibase Occurrence # 171860
Last updated: 19 August 2017
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Time:14:00 LT
Type:Silhouette image of generic R44 model; specific model in this crash may look slightly different
Robinson R44 Raven II
Owner/operator:Native Range
Registration: N3234U
C/n / msn: 11654
Fatalities:Fatalities: 2 / Occupants: 2
Other fatalities:0
Airplane damage: Written off (damaged beyond repair)
Location:SE of Skypark Airport (KBTF), Bountiful, UT -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Departure airport:Skypark Airport (KBTF)
Destination airport:Skypark Airport (KBTF)
The local flight was conducted under Part 91 as a post maintenance flight. Witnesses reportedly heard popping sounds then saw the main rotor and empennage separate from the helicopter as the helicopter flew overhead. Several then saw the helicopter tumble and impact the top of a building. The main rotor blade and empennage impacted the ground a few hundred feet from the impacted building.

The owner of the helicopter reported that mechanics performed maintenance to the main rotor assembly and the purpose of the post-maintenance flight was to check the "track and balance" of the main rotor blades.

The helicopter impacted the top of a two-story building about 2,000 feet southwest of the approach end of runway 34 at BTF. A post-impact fire occurred that was concentrated at the main wreckage. The main wreckage had impact damage and was partially damaged by postimpact fire. The main rotor and empennage were found within the wreckage debris field. The wreckage debris field was about 880 feet in length and about 400 feet in width and on a 277 degree magnetic heading.

The National Transportation Safety Board determines the probable cause(s) of this accident as follows: The pilot/mechanic's failure to properly secure the pitch link hardware of one main rotor blade to the rotating swash plate, which resulted in the pitch link separating in flight and a subsequent loss of control


Revision history:

03-Dec-2014 07:17 gerard57 Added
03-Dec-2014 07:17 harro Updated [Aircraft type, Departure airport, Embed code]
03-Dec-2014 07:33 gerard57 Updated [Embed code, Narrative]
03-Dec-2014 15:57 harro Updated [Aircraft type, Registration, Cn, Operator]
03-Dec-2014 17:33 Geno Updated [Location, Departure airport, Source]
10-Dec-2014 18:04 Geno Updated [Location, Phase, Nature, Destination airport, Source]
11-Dec-2014 20:54 Aerossurance Updated [Narrative]
22-Dec-2014 14:11 Aerossurance Updated [Source]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
12-Apr-2017 12:19 Aerossurance Updated [Time, Operator, Location, Source, Damage, Narrative]
16-Apr-2017 12:35 Aerossurance Updated [Source]
16-Apr-2017 13:30 Aerossurance Updated [Source]

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