# Proposed AD FAA-2012-0632: Eurocopter France Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-26-10
- Products: Eurocopter France
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 18, 2012, 77 FR 36220
- Comments due: August 17, 2012
- Became: [AD 2012-26-10](https://openairdocs.org/ad/2012-26-10)
- Docket: FAA-2012-0632 (https://www.regulations.gov/docket/FAA-2012-0632, where comments are filed)
- Project: 2011-SW-044-AD
- FR document: 2012-14805
- Official PDF: https://openairdocs.org/files/sha256/96/df/96df66689d90a523ca372e399f5acfccd199d57490f3ed1c96143c4e34a9218b (from https://www.govinfo.gov/content/pkg/FR-2012-06-18/pdf/2012-14805.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/06/18/2012-14805/airworthiness-directives-eurocopter-france-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/03A6E5CDF1562D9786257A21004DD448.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0632

## Summary

We propose to adopt a new airworthiness directive (AD) for all Eurocopter France (Eurocopter) Model SA-365N, SA-365N1, AS-365N2, AS 365 N3, EC 155B, EC155B1, SA-365C, SA-365C1, SA-365C2, and SA-366G1 helicopters. This proposed AD is prompted by reports of corrosion on the main gearbox (MGB) casing lower area between the two servo-control anchoring fitting attachment ribs. An investigation determined that the corrosion was associated with sealing compound on the lower part of the fitting/casing attachment. The proposed actions are intended to detect corrosion on the MGB casing, which could lead to a crack, failure of the MGB, and subsequent loss of control of the helicopter.

## Notices in this docket

- Jun 18, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-14805, comments due Aug 17, 2012 (https://www.federalregister.gov/documents/2012/06/18/2012-14805/airworthiness-directives-eurocopter-france-helicopters)

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