# Airworthiness Directives; Bell Helicopter Textron, Inc. (Bell) Helicopters
> **Rule** · Final rule; request for comments. · Published 2017-07-20 · Effective 2017-08-04 · 82 FR 33439
## Document
- **Document number:** 2017-15031
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 82 FR 33439
- **Publication date:** 2017-07-20
- **Effective date:** 2017-08-04
- **FAA docket:** Docket No. FAA-2017-0701
## Abstract

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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2017/07/20/2017-15031/airworthiness-directives-bell-helicopter-textron-inc-bell-helicopters)
---
*AI Analytics · CC0 1.0*