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ASN Wikibase Occurrence # 70870
Last updated: 7 October 2021
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Type:Silhouette image of generic S61 model; specific model in this crash may look slightly different
Sikorsky S-61A (SH-3G)
Owner/operator:Carson Helicopters
Registration: N8170V
MSN: 61-232
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Location:near Glady, WV -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:External load operation
Departure airport:Glady, WV (NONE)
Destination airport:Glady, WV (NONE)
Investigating agency: NTSB
The helicopter came out of maintenance, the captain and first officer conducted a test flight, and then ferried it to the area of operation. The next day, the captain entered a 155-foot out of ground effect hover, and an external load was connected. About the same time, the helicopter started a slow uncommanded yaw to the right. The captain applied full left pedal, released the load, and entered an autorotation. Examination of the tailrotor control system revealed that the left anti-torque control cable was broken. The break was associated with a pulley assembly, the cable strands were bent rearward, and deformed. The cable fracture surfaces were irregular, and also deformed. The associated keeper pins displayed wear marks, and light scratches consistent with control cable contact. The associated pulley was intact. The pulley channel contained an oil-based debris, and control cable fragments. Both tailrotor cables were removed and reinstalled within the last 5.3 hours of operation by company maintenance personnel.
Probable Cause: The improper installation of the left tailrotor control cable by company maintenance personnel.




Revision history:

31-Dec-2009 10:16 TB Added
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
08-Dec-2017 18:01 ASN Update Bot Updated [Operator, Nature, Departure airport, Destination airport, Source, Narrative]

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