Airworthiness Directives; Eurocopter France Model AS332C, C1, L, and L1 Helicopters

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This document proposes adopting a new airworthiness directive (AD) for Eurocopter France (Eurocopter) Model AS332C, C1, L, and L1 helicopters. This proposal would require inspecting the main gearbox bevel gear (bevel gear) for a crack using a borescope. This proposal is prompted by a crack that was detected on a bevel gear during a main gearbox teardown inspection. The actions specified by this proposed AD are intended to detect a bevel gear crack and prevent failure of the bevel gear, loss of torque to the main rotor system, and subsequent loss of control of the helicopter.