# Airworthiness Directives; Leonardo S.p.a. Helicopters
> **Rule** · Final rule. · Published 2021-08-20 · Effective 2021-09-24 · 86 FR 46761
## Document
- **Document number:** 2021-17841
- **Category:** airworthiness
- **Manufacturer:** Leonardo S.p.a.
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 46761
- **Publication date:** 2021-08-20
- **Effective date:** 2021-09-24
- **FAA docket:** Docket No. FAA-2021-0455
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Leonardo S.p.a. Model AW189 helicopters. This AD was prompted by fatigue testing and analyses. This AD requires establishing a life limit for a certain part-numbered tail gearbox fitting. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/08/20/2021-17841/airworthiness-directives-leonardo-spa-helicopters)
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