# Airworthiness Directives; Bell Textron Canada Limited Helicopters
> **Rule** · Final rule. · Published 2022-11-18 · Effective 2022-12-23 · 87 FR 69155
## Document
- **Document number:** 2022-25028
- **Category:** airworthiness
- **Manufacturer:** Bell Textron Canada Limited
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 87 FR 69155
- **Publication date:** 2022-11-18
- **Effective date:** 2022-12-23
- **FAA docket:** Docket No. FAA-2022-0807
## Abstract

The FAA is superseding airworthiness directive (AD) 2021-26- 08, which applied to certain Bell Textron Canada Limited Model 206, 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, 206L-3, and 206L-4 helicopters. AD 2021-26-08 required removing certain nuts from service; installing newly designed nuts; applying a specific torque, and a torque stripe to each newly installed nut; after the installation of each newly designed nut, inspecting the torque; and depending on the inspection results, either applying a torque stripe, or performing further inspections and removing certain parts from service. AD 2021- 26-08 also prohibited installing any affected nut on any tail rotor drive shaft (TRDS) disc pack (Thomas) coupling. Since the FAA issued AD 2021-26-08, the FAA determined certain torque values and part numbers (P/Ns) need to be revised. This AD was prompted by reports of cracked or missing nuts installed on the TRDS Thomas couplings and the need to revise certain torque values and P/Ns in AD 2021-26-08. This AD requires removing certain nuts from service; installing newly designed nuts; applying torque and a torque stripe; and additional corrective actions if necessary. This AD also prohibits installing any affected nut on any TRDS Thomas coupling, as specified in a Transport Canada AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2022/11/18/2022-25028/airworthiness-directives-bell-textron-canada-limited-helicopters)
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