# Airworthiness Directives; Turbomeca S.A. Arrius 2F Turboshaft Engines
> **Rule** · Final rule; request for comments. · Published 2005-08-26 · Effective 2005-09-12 · 70 FR 50164
## Document
- **Document number:** 05-16834
- **Category:** airworthiness
- **Manufacturer:** Turbomeca S.A. Arrius 2F Turboshaft
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 70 FR 50164
- **Publication date:** 2005-08-26
- **Effective date:** 2005-09-12
- **FAA docket:** Docket No. FAA-2005-22039
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Turbomeca S.A. Arrius 2F turboshaft engines. This AD requires replacing certain O-rings on the check valve piston in the lubrication unit. This AD results from a report of a forced landing of a Eurocopter EC120B helicopter. We are issuing this AD to prevent an uncommanded in-flight shutdown of the engine, which could result in a forced autorotation landing and damage to the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/08/26/05-16834/airworthiness-directives-turbomeca-sa-arrius-2f-turboshaft-engines)
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