# Airworthiness Directives; Leonardo S.p.A. Helicopters
> **Rule** · Final rule; request for comments. · Published 2019-03-13 · Effective 2019-03-28 · 84 FR 8965
## Document
- **Document number:** 2019-04529
- **Category:** airworthiness
- **Manufacturer:** Leonardo S.p.A.
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 84 FR 8965
- **Publication date:** 2019-03-13
- **Effective date:** 2019-03-28
- **FAA docket:** Docket No. FAA-2019-0092
## Abstract

We are adopting a new airworthiness directive (AD) for Leonardo S.p.A. Model AB139, AW139, AW169, and AW189 helicopters. This AD requires removing certain part-numbered and serial-numbered tail rotor (T/R) duplex bearings from service. This AD is prompted by a report of a failed T/R duplex bearing roughness inspection. The actions of this AD are intended to address an unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/03/13/2019-04529/airworthiness-directives-leonardo-spa-helicopters)
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