# Proposed AD FAA-2017-0667: Bell Helicopter Textron Canada Limited (Bell) Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2018-10-06
- Products: Bell Helicopter Textron Canada
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 7, 2017, 82 FR 31535
- Comments due: September 5, 2017
- Became: [AD 2018-10-06](https://openairdocs.org/ad/2018-10-06)
- Docket: FAA-2017-0667 (https://www.regulations.gov/docket/FAA-2017-0667, where comments are filed)
- Project: 2016-SW-053-AD
- FR document: 2017-14231
- Official PDF: https://openairdocs.org/files/sha256/46/82/4682742f732a7884293602d3f460eec245033ccfa3f11bf192d1af815cfeffb4 (from https://www.govinfo.gov/content/pkg/FR-2017-07-07/pdf/2017-14231.pdf)
- Federal Register: https://www.federalregister.gov/documents/2017/07/07/2017-14231/airworthiness-directives-bell-helicopter-textron-canada-limited-bell-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EE5CA75D25002B7186258156004A608C.0001
- Page: https://openairdocs.org/proposed/FAA-2017-0667

## Summary

We propose to adopt a new airworthiness directive (AD) for Bell Model 407 helicopters. This proposed AD would require repetitive inspections of the tail rotor (TR) driveshaft segment assemblies and a torque check of the TR adapter retention nuts. This proposed AD is prompted by a report of an in-flight failure of the TR drive system. The proposed actions are intended to detect and correct an unsafe condition on these products.

## Notices in this docket

- Jul 7, 2017: Notice of proposed rulemaking (NPRM). (first notice), FR document 2017-14231, comments due Sep 5, 2017 (https://www.federalregister.gov/documents/2017/07/07/2017-14231/airworthiness-directives-bell-helicopter-textron-canada-limited-bell-helicopters)

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