# Proposed AD FAA-2021-0513: Bell Textron Canada Limited (Type Certificate Previously Held by Bell Helicopter Textron Canada Limited) Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-18-16
- Products: Bell Textron Canada
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 28, 2021, 86 FR 33918
- Comments due: August 12, 2021
- Became: [AD 2021-18-16](https://openairdocs.org/ad/2021-18-16)
- Docket: FAA-2021-0513 (https://www.regulations.gov/docket/FAA-2021-0513, where comments are filed)
- Project: 2018-SW-116-AD
- FR document: 2021-13644
- Official PDF: https://openairdocs.org/files/sha256/56/e6/56e61fc8fcf83abcb5cb2eb6649f8b2106d5b7def5a189cb5a0781fb24a87700 (from https://www.govinfo.gov/content/pkg/FR-2021-06-28/pdf/2021-13644.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/06/28/2021-13644/airworthiness-directives-bell-textron-canada-limited-type-certificate-previously-held-by-bell
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A81D29E378574FF1862587020056153C.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0513

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Bell Textron Canada Limited (Bell) Model 429 helicopters. This proposed AD was prompted by reports of tail rotor gearbox assemblies found loose on the gearbox support. This proposed AD would require repetitive torque checks of the tail rotor gearbox attachment hardware, and corrective action if necessary. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jun 28, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-13644, comments due Aug 12, 2021 (https://www.federalregister.gov/documents/2021/06/28/2021-13644/airworthiness-directives-bell-textron-canada-limited-type-certificate-previously-held-by-bell)

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