# Airworthiness Directives; Eurocopter France Model AS350B, AS350B1, AS350B2, AS350B3, AS350BA, AS350C, AS350D, and AS350D1 Helicopters
> **Rule** · Final rule. · Published 2007-03-19 · Effective 2007-04-23 · 72 FR 12727
## Document
- **Document number:** E7-4851
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 72 FR 12727
- **Publication date:** 2007-03-19
- **Effective date:** 2007-04-23
- **FAA docket:** Docket No. FAA-2006-25085
## Abstract

This amendment adopts a new airworthiness directive (AD) for the specified Eurocopter France (Eurocopter) model helicopters that requires replacing a certain hydraulic drive belt (drive belt). Also required is reducing the lubrication time interval for a certain hydraulic pump drive shaft (drive shaft). This amendment is prompted by in-flight failures of the drive belt and the drive shaft. The actions specified by this AD are intended to prevent in-flight failure of the drive belt or drive shaft, loss of hydraulic power to the flight control system, and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2007/03/19/E7-4851/airworthiness-directives-eurocopter-france-model-as350b-as350b1-as350b2-as350b3-as350ba-as350c)
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