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ASN Wikibase Occurrence # 137712
Last updated: 23 June 2019
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Date:25-JUL-2011
Time:11:45
Type:Silhouette image of generic S55P model; specific model in this crash may look slightly different
Sikorsky S-55B
Owner/operator:Golden Wings
Registration: N855TC
C/n / msn: 551005
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Category:Accident
Location:Near Brewster, WA -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Unknown
Departure airport:Brewster, WA
Destination airport:Brewster, WA
Investigating agency: NTSB
Narrative:
The helicopter pilot was conducting a low-level flight over orchards for the purpose of drying cherry trees. The orchard was bordered by a series of power lines, and a gusting, variable wind was present at the time of the flight. During a low hovering pass over the orchard, a gust of wind pushed the helicopter toward power lines. In an attempt to avoid the power lines, the pilot increased collective pitch, and the helicopter began to climb. During the climb, the main rotor rpm decayed and the nose of the helicopter yawed to the right. The pilot lowered the collective and increased the engine power in an effort to regain main rotor rpm; however, the helicopter descended into the orchard. The pilot reported no preimpact mechanical malfunctions or failures with the helicopter that would have precluded normal operations, and that the accident could have been prevented if the flight had been conducted after the wind diminished.
Probable Cause: The pilot did not maintain main rotor rpm while hovering in gusting wind conditions.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20110802X61652&key=1


Revision history:

Date/timeContributorUpdates
26-Jul-2011 08:23 RobertMB Added
26-Jul-2011 08:45 gerard57 Updated [Total occupants]
21-Dec-2016 19:26 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
27-Nov-2017 17:02 ASN Update Bot Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative]

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