# Airworthiness Directives; Turbomeca S.A. Arrius 1A Turboshaft Engines
> **Rule** · Final rule; request for comments. · Published 2005-05-27 · Effective 2005-06-13 · 70 FR 30613
## Document
- **Document number:** 05-10295
- **Category:** airworthiness
- **Manufacturer:** Turbomeca S.A. Arrius 1A Turboshaft
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 70 FR 30613
- **Publication date:** 2005-05-27
- **Effective date:** 2005-06-13
- **FAA docket:** Docket No. FAA-2005-21273
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Turbomeca S.A. Arrius 1A turboshaft engines. This AD requires initial and repetitive testing of the Free Turbine Overspeed Protection System. This AD results from an investigation into the Digital Electronic Control Unit (DECU) that revealed a malfunction of the Free Turbine Overspeed Protection System. This malfunction can exist despite the DECU passing all functional tests specified in the Engine Maintenance Manual. We are issuing this AD to prevent uncontained engine failure if a free turbine overspeed occurs.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/05/27/05-10295/airworthiness-directives-turbomeca-sa-arrius-1a-turboshaft-engines)
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