# Proposed AD FAA-2020-0171: Bell Helicopter Textron, Inc. Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2020-14-01
- Products: Bell Helicopter Textron
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 26, 2020, 85 FR 11003
- Comments due: April 13, 2020
- Became: [AD 2020-14-01](https://openairdocs.org/ad/2020-14-01)
- Docket: FAA-2020-0171 (https://www.regulations.gov/docket/FAA-2020-0171, where comments are filed)
- FR document: 2020-03851
- Official PDF: https://openairdocs.org/files/sha256/36/22/3622f323b12d867489265f9bed005cf2d62d73265d2b9ce2f8c066a5dfcb17c0 (from https://www.govinfo.gov/content/pkg/FR-2020-02-26/pdf/2020-03851.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/02/26/2020-03851/airworthiness-directives-bell-helicopter-textron-inc-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A309B82BE209DB518625851F007E79CB.0001
- Page: https://openairdocs.org/proposed/FAA-2020-0171

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for Bell Helicopter Textron, Inc. (Bell) Model 214ST helicopters. This proposed AD was prompted by the discovery of bolts with nonconforming external thread root radii. This proposed AD would require removing the affected bolts from service and would prohibit installing an affected bolt on any helicopter. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Feb 26, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-03851, comments due Apr 13, 2020 (https://www.federalregister.gov/documents/2020/02/26/2020-03851/airworthiness-directives-bell-helicopter-textron-inc-helicopters)

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