# Airworthiness Directives; Bell Helicopter Textron, Inc. (Bell) Helicopters
> **Rule** · Final rule; request for comments. · Published 2018-08-21 · Effective 2018-09-05 · 83 FR 42205
## Document
- **Document number:** 2018-17905
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 83 FR 42205
- **Publication date:** 2018-08-21
- **Effective date:** 2018-09-05
- **FAA docket:** Docket No. FAA-2018-0738
## Abstract

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 to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/08/21/2018-17905/airworthiness-directives-bell-helicopter-textron-inc-bell-helicopters)
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