# Airworthiness Directives; Eurocopter France Model EC 155B, EC155B1, SA-360C, SA-365C, SA-365C1, SA-365C2, SA-365N, SA-365N1, AS-365N2, AS 365 N3, and SA-366G1 Helicopters
> **Rule** · Final rule; request for comments. · Published 2005-02-14 · Effective 2005-03-01 · 70 FR 7382
## Document
- **Document number:** 05-2585
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 70 FR 7382
- **Publication date:** 2005-02-14
- **Effective date:** 2005-03-01
- **FAA docket:** Docket No. FAA-2005-20294
## Abstract

This amendment adopts a new airworthiness directive (AD) for the specified Eurocopter France (Eurocopter) model helicopters. This action requires an initial and repetitive borescope inspection of the main gearbox (MGB) planet gear carrier or an initial and repetitive visual inspection of the MGB planet gear carrier for a crack. Replacing any MGB that has a cracked planet gear carrier is required before further flight. This amendment is prompted by the discovery of cracks in the web of the planet gear carrier. The actions specified in this AD are intended to detect a crack in the web of the planet gear carrier, which could lead to a MGB seizure and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/02/14/05-2585/airworthiness-directives-eurocopter-france-model-ec-155b-ec155b1-sa-360c-sa-365c-sa-365c1-sa-365c2)
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