BELL HELICOPTER TEXTRON, Inc. (Bell) Helicopters [Docket No. FAA-2018-0953; Product Identifier 2018-SW-079-AD; Amendment 39-19636; AD 2019-09-02] The FAA is superseding Airworthiness Directive (AD) 2018-17-01 for Bell Model 212, 412, 412CF, and 412EP helicopters. AD 2018-17-01 required replacing certain oil and fuel check valves and prohibited installing these valves on any helicopter. This AD retains the requirements of AD 2018-17-01 but expands those requirements for all model helicopters. ...

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