Airworthiness Directives; Eurocopter France Model AS 365 N3 and EC 155B Helicopters

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This document proposes adopting a new airworthiness directive (AD) for the specified Eurocopter France (Eurocopter) helicopters. This proposal would revise the Airworthiness Limitations section of the maintenance manuals by establishing a new service life limit for the Fenestron pitch change control rod (control rod). This proposal is prompted by a failure of a control rod on a prototype helicopter that led to a precautionary landing. The actions specified by this proposed AD are intended to prevent failure of the control rod, loss of control of the tail rotor, and subsequent loss of control of the helicopter.