# Proposed AD FAA-2013-0489: Bell Helicopter Textron Canada Limited

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2015-12-02
- Products: Bell Helicopter Textron Canada
- Product type: Aircraft
- Action: Supplemental notice of proposed rulemaking (SNPRM); reopening of comment period.
- Published: October 3, 2014, 79 FR 59695
- Comments due: December 2, 2014
- Became: [AD 2015-12-02](https://openairdocs.org/ad/2015-12-02)
- Docket: FAA-2013-0489 (https://www.regulations.gov/docket/FAA-2013-0489, where comments are filed)
- Project: 2008-SW-003-AD
- FR document: 2014-23582
- Official PDF: https://openairdocs.org/files/sha256/eb/91/eb915c3f5c63feb3b29816a293f45e8d4c0cfdba0c11b949057fcfa59aa8a685 (from https://www.govinfo.gov/content/pkg/FR-2014-10-03/pdf/2014-23582.pdf)
- Federal Register: https://www.federalregister.gov/documents/2014/10/03/2014-23582/airworthiness-directives-bell-helicopter-textron-canada-limited
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A326D35158EB477586257D66004BAA2A.0001
- Page: https://openairdocs.org/proposed/FAA-2013-0489

## Summary

We are revising and reopening the comment period for an earlier notice of proposed rulemaking (NPRM) for certain Bell Helicopter Textron Canada Limited (Bell) Model 206L-3 and 206L-4 helicopters. The NPRM proposes to require installing a placard and revising the limitations section of the rotorcraft flight manual (RFM). The NPRM was prompted by several incidents of third stage engine turbine wheel failures caused by excessive vibrations at certain engine speeds during steady-state operations. This action proposes to revise the NPRM by adding certain Model 206L1 helicopters to the applicability, excluding certain Model 206L3 and 206L4 helicopters from the applicability, and changing the procedures for updating the RFM. Since these actions impose an additional burden over that proposed in the NPRM, we are reopening the comment period to allow the public the chance to comment on these proposed changes.

## Notices in this docket

- Jun 7, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-13483, comments due Aug 6, 2013 (https://www.federalregister.gov/documents/2013/06/07/2013-13483/airworthiness-directives-bell-helicopter-textron-canada-limited-bell-helicopters)
- Oct 3, 2014: Supplemental notice of proposed rulemaking (SNPRM); reopening of comment period., FR document 2014-23582, comments due Dec 2, 2014 (https://www.federalregister.gov/documents/2014/10/03/2014-23582/airworthiness-directives-bell-helicopter-textron-canada-limited)

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