# Proposed AD FAA-2009-1090: Eurocopter France Model AS355E, AS355F, AS355F1, AS355F2, and AS355N Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-06-03
- Products: Eurocopter France
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 10, 2009, 74 FR 65492
- Comments due: January 11, 2010
- Became: [AD 2010-06-03](https://openairdocs.org/ad/2010-06-03)
- Docket: FAA-2009-1090 (https://www.regulations.gov/docket/FAA-2009-1090, where comments are filed)
- Project: 2009-SW-31-AD
- FR document: E9-29431
- Official PDF: https://openairdocs.org/files/sha256/ba/cc/bacc339a9415b222a200b2ab192c2f34fde7cd688913b96a6fef124bd66dfa8c (from https://www.govinfo.gov/content/pkg/FR-2009-12-10/pdf/E9-29431.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/12/10/E9-29431/airworthiness-directives-eurocopter-france-model-as355e-as355f-as355f1-as355f2-and-as355n
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C52BCC4DA3AB15A6862576880054EA26.0001
- Page: https://openairdocs.org/proposed/FAA-2009-1090

## Summary

We propose to adopt a new airworthiness directive (AD) for Eurocopter France (Eurocopter) Model AS355E, AS355F, AS355F1, AS355F2, and AS355N 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 states that a metallurgical non-conformity was discovered on a flange of the forward shaft section of the tail rotor drive shaft (drive shaft). The MCAI AD also states that stress analysis has shown that this non-conformity can significantly reduce the strength of the drive shaft and thereby its service life. The proposed actions are intended to remove non- conforming drive shafts from service and prevent failure of the drive shaft and subsequent loss of control of the helicopter.

## Notices in this docket

- Dec 10, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-29431, comments due Jan 11, 2010 (https://www.federalregister.gov/documents/2009/12/10/E9-29431/airworthiness-directives-eurocopter-france-model-as355e-as355f-as355f1-as355f2-and-as355n)

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