# Proposed AD FAA-2010-0426: Eurocopter France (ECF) Model SA-365N1, AS-365N2, AS 365 N3, EC 155B, and EC155B1 Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-19-05
- Products: Eurocopter France
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 22, 2010, 75 FR 20931
- Comments due: May 24, 2010
- Became: [AD 2010-19-05](https://openairdocs.org/ad/2010-19-05)
- Docket: FAA-2010-0426 (https://www.regulations.gov/docket/FAA-2010-0426, where comments are filed)
- Project: 2009-SW-34-AD
- FR document: 2010-9292
- Official PDF: https://openairdocs.org/files/sha256/e5/14/e514336fb891e8e3e357aab52a1f3ad4b186562a477b295800a5a13bddbfc21a (from https://www.govinfo.gov/content/pkg/FR-2010-04-22/pdf/2010-9292.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/04/22/2010-9292/airworthiness-directives-eurocopter-france-ecf-model-sa-365n1-as-365n2-as-365-n3-ec-155b-and-ec155b1
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CA5ED56206C2C08D8625770D0045EC16.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0426

## Summary

We propose to adopt a new airworthiness directive (AD) for the specified ECF model helicopters. This proposed AD results from a mandatory continuing airworthiness information (MCAI) AD issued by the European Aviation Safety Agency (EASA), which is the Technical Agent for the Member States of the European Community. The MCAI AD reports the separation and loss of a stainless steel ring (75 millimeter (mm) in diameter) from a tail rotor blade (blade) sleeve resulting in severe, high-frequency vibrations, which can lead to damage to the fenestron blades, loss of yaw control, and subsequent loss of control of the helicopter.

## Notices in this docket

- Apr 22, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-9292, comments due May 24, 2010 (https://www.federalregister.gov/documents/2010/04/22/2010-9292/airworthiness-directives-eurocopter-france-ecf-model-sa-365n1-as-365n2-as-365-n3-ec-155b-and-ec155b1)

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