# Airworthiness Directives; Bell Helicopter Textron, Inc. (Bell) Helicopters
> **Rule** · Final rule; request for comments. · Published 2019-05-20 · Effective 2019-06-04 · 84 FR 22695
## Document
- **Document number:** 2019-10310
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 84 FR 22695
- **Publication date:** 2019-05-20
- **Effective date:** 2019-06-04
- **FAA docket:** Docket No. FAA-2018-0953
## Abstract

We are 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. This AD was prompted by the discovery that we omitted a helicopter model from one of the required actions. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/05/20/2019-10310/airworthiness-directives-bell-helicopter-textron-inc-bell-helicopters)
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