We are adopting a new airworthiness directive (AD) for Bell Model 212 and Model 412 helicopters. This AD requires replacing certain oil and fuel check valves and prohibits installing them on any helicopter. This AD is prompted by a report of cracked or leaking check valves. These actions are intended to address an unsafe condition on these helicopters.
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Airworthiness Directives; Bell Helicopter Textron, Inc. (Bell) Helicopters
We are adopting a new airworthiness directive (AD) for Bell Model 212 and Model 412 helicopters. This AD requires replacing certain oil and fuel check valves and prohibits insta...
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82 FR 33439
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“Airworthiness Directives; Bell Helicopter Textron, Inc. (Bell) Helicopters,” thefederalregister.org (July 20, 2017), https://thefederalregister.org/documents/2017-15031/airworthiness-directives-bell-helicopter-textron-inc-bell-helicopters.