# Airworthiness Directives; Robinson Helicopter Company Helicopters
> **Rule** · Final rule. · Published 2021-03-08 · Effective 2021-04-12 · 86 FR 13162
## Document
- **Document number:** 2021-03656
- **Category:** airworthiness
- **Manufacturer:** Robinson Helicopter Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 13162
- **Publication date:** 2021-03-08
- **Effective date:** 2021-04-12
- **FAA docket:** Docket No. FAA-2017-0682
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Robinson Helicopter Company (Robinson) Model R66 helicopters. This AD was prompted by reports of tail rotor (T/R) drive shaft forward hanger bearing failures. This AD requires installing a certain part numbered kit and removing parts from service or replacing a certain part- numbered T/R drive shaft assembly. This AD also prohibits the installation of certain parts. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/03/08/2021-03656/airworthiness-directives-robinson-helicopter-company-helicopters)
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