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ASN Wikibase Occurrence # 132324
Last updated: 23 January 2021
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Date:13-JUL-1988
Time:12:30
Type:Silhouette image of generic LAMA model; specific model in this crash may look slightly different
Aérospatiale SA 315B
Owner/operator:Gradney Helicopters, Inc.
Registration: N3128G
C/n / msn: 2488
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Oakridge, OR -   United States of America
Phase: En route
Nature:External load operation
Departure airport:
Destination airport:
Investigating agency: NTSB
Narrative:
WHILE SLINGING A LOG THE PILOT ALLOWED THE LOG/SLING LINE TO CONTACT A TREE. THE MOMENTUM OF THE LOG AND HELICOPTER BOWED THE TREE OVER WHEN THE LINE CONTACTED IT. THE PILOT CHOSE TO RELEASE THE LOG FROM THE SLING LINE RATHER THAN DISENGAGE THE ENTIRE LINE AND LOG FROM THE HELICOPTER. ONCE THE LOG SEPARATED, THE LINE CAUGHT IN THE TREE WHICH RETURNED TO AN UPRIGHT ATTITUDE AND PULLED THE LINE TIGHT. THE FORCE APPLIED TO THE HELICOPTER AS THE LINE TIGHTENED, IN TURN ROTATED THE HELICOPTER ABOUT ITS LONGITUDINAL AXIS TO A POINT WHEREBY THE PILOT LOST CONTROL. SHORTLY THEREAFTER THE HELICOPTER DESCENDED INTO THE TREES AND COLLIDED WITH THE TERRAIN.

Sources:

https://app.ntsb.gov/pdfgenerator/ReportGeneratorFile.ashx?EventID=20001213X26393&AKey=1&RType=Final&IType=LA
http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=3128G


Revision history:

Date/timeContributorUpdates
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
04-Mar-2018 11:52 Bowzo Updated [Source, Damage, Narrative]
04-Mar-2018 11:53 harro Updated [Source, Narrative]

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