# Airworthiness Directives; Bell Textron Canada Limited (Type Certificate Previously Held by Bell Helicopter Textron Canada Limited) Helicopters
> **Rule** · Final rule. · Published 2021-12-09 · Effective 2022-01-13 · 86 FR 69998
## Document
- **Document number:** 2021-26605
- **Category:** airworthiness
- **Manufacturer:** Bell Textron Canada Limited (Type Certificate Previously Held by Bell Helicopter Textron Canada Limited)
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 69998
- **Publication date:** 2021-12-09
- **Effective date:** 2022-01-13
- **FAA docket:** Docket No. FAA-2021-0783
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Bell Textron Canada Limited (type certificate previously held by Bell Helicopter Textron Canada Limited) Model 505 helicopters. This AD was prompted by the determination that reducing the pressure altitude limitations for certain fuel types is necessary. 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/2021/12/09/2021-26605/airworthiness-directives-bell-textron-canada-limited-type-certificate-previously-held-by-bell)
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