# Airworthiness Directives; Bell Textron Canada Limited Helicopters
> **Rule** · Final rule. · Published 2021-09-07 · Effective 2021-10-12 · 86 FR 49909
## Document
- **Document number:** 2021-19049
- **Category:** airworthiness
- **Manufacturer:** Bell Textron Canada Limited
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 49909
- **Publication date:** 2021-09-07
- **Effective date:** 2021-10-12
- **FAA docket:** Docket No. FAA-2021-0497
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Bell Textron Canada Limited Model 429 helicopters. This AD was prompted by three reports of unexpected forces or uncommanded inputs to the directional (yaw) control system. This AD requires revising the existing Rotorcraft Flight Manual (RFM) for your helicopter. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/09/07/2021-19049/airworthiness-directives-bell-textron-canada-limited-helicopters)
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