Superseded. This AD was superseded by AD 2019-09-02. Verify which one applies to your serial and effectivity before any maintenance action.
AD 2018-17-01
Effective 09/05/2018 · Published 08/21/2018
Airworthiness Directives; Bell Helicopter Textron, Inc. (Bell) Helicopters
Summary
We are superseding Airworthiness Directive (AD) 2017-15-02 for Bell Model 212 and 412 helicopters. AD 2017-15-02 required replacing certain oil and fuel check valves and prohibited installing them on any helicopter. This AD retains the requirements of AD 2017-15-02 and adds certain model helicopters to the applicability. This AD was prompted by the discovery of an error in the affected models. We are issuing this AD…