# Airworthiness Directives; Bell Textron Inc. (Type Certificate Previously Held by Bell Helicopter Textron Inc.) Helicopters
> **Rule** · Final rule; request for comments. · Published 2020-11-03 · Effective 2020-11-18 · 85 FR 69485
## Document
- **Document number:** 2020-24258
- **Category:** airworthiness
- **Manufacturer:** Bell Textron Inc. (Type Certificate Previously Held by Bell Helicopter Textron Inc.)
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 85 FR 69485
- **Publication date:** 2020-11-03
- **Effective date:** 2020-11-18
- **FAA docket:** Docket No. FAA-2020-0921
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Bell Textron Inc. (Type Certificate previously held by Bell Helicopter Textron Inc.) Model 412, 412CF, and 412EP helicopters. This AD requires revising the existing Rotorcraft Flight Manual (RFM) for your helicopter. This AD was prompted by an accident and multiple reports of a cracked main gearbox (MGB) support case. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/11/03/2020-24258/airworthiness-directives-bell-textron-inc-type-certificate-previously-held-by-bell-helicopter)
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