We are adopting a new airworthiness directive (AD) for Bell Model 407 helicopters. This AD requires repetitive inspections of the tail rotor (TR) driveshaft segment assemblies and a torque check of the TR adapter retention nuts. This AD was prompted by a report of an in- flight failure of the TR drive system. The actions of this AD are intended to detect and correct an unsafe condition on these products.
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Airworthiness Directives; Bell Helicopter Textron Canada Limited (Bell) Helicopters
We are adopting a new airworthiness directive (AD) for Bell Model 407 helicopters. This AD requires repetitive inspections of the tail rotor (TR) driveshaft segment assemblies a...
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83 FR 23349
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“Airworthiness Directives; Bell Helicopter Textron Canada Limited (Bell) Helicopters,” thefederalregister.org (May 21, 2018), https://thefederalregister.org/documents/2018-10491/airworthiness-directives-bell-helicopter-textron-canada-limited-bell-helicopters.