Loss of Tail Rotor Authority Prompts S-92 Emergency AD | Aviation International News

Regulations and Government

Loss of Tail Rotor Authority Prompts S-92 Emergency AD

Preliminary investigation of the incident helicopter found binding in the assembly's double-row angular contact bearing.

By Mark Huber • Contributor

November 28, 2016

The report of a Sikorsky S-92A operator losing tail rotor authority while in a hover has prompted the FAA to issue Emergency Airworthiness Directive 2016-24-51, which calls for inspecting helicopters with recently installed tail rotor pitch change shaft (TRPCS) assemblies before further or significant flight, dependent on the flight hours since the assembly was installed.

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