# Airworthiness Directives; Turbomeca S.A. Arrius 2 B1, 2 B1A, 2 B1A-1, and 2 B2 Turboshaft Engines
> **Rule** · Final rule; request for comments. · Published 2005-06-14 · Effective 2005-06-29 · 70 FR 34334
## Document
- **Document number:** 05-11611
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 70 FR 34334
- **Publication date:** 2005-06-14
- **Effective date:** 2005-06-29
- **FAA docket:** Docket No. FAA-2005-21443
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Turbomeca S.A. Arrius 2 B1, 2 B1A, 2 B1A-1, and 2 B2 turboshaft engines. This AD requires replacing the software in the Engine Electronic Control Unit (EECU). This AD results from a report of simultaneous loss of automatic control of both engines of a Eurocopter Deutschland EC 135 helicopter, during flight. We are issuing this AD to prevent simultaneous loss of automatic control of both engines and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/06/14/05-11611/airworthiness-directives-turbomeca-sa-arrius-2-b1-2-b1a-2-b1a-1-and-2-b2-turboshaft-engines)
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