Airworthiness Directives; MD Helicopters, Inc. (MDHI) Model 500N and 600N Helicopters

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This amendment adopts a new airworthiness directive (AD) for MD Helicopters, Inc. (MDHI) Model 500N and 600N helicopters. This action requires using a bright light and a 10x or higher magnifying glass to inspect each forward and center thruster control cable assembly connector (connector) for corrosion pitting or cracking. If you find corrosion pitting or cracking, this AD also requires replacing the cable assembly with an airworthy cable assembly before further flight. This amendment is prompted by a report of a failure of the forward thruster cable assembly due to stress corrosion. The actions specified in this AD are intended to detect a corrosion-pitted or cracked connector and prevent failure of the cable assembly and subsequent loss of control of the helicopter.