# Airworthiness Directives; Turbomeca S.A. Turboshaft Engines
> **Rule** · Final rule. · Published 2012-04-25 · Effective 2012-05-30 · 77 FR 24585
## Document
- **Document number:** 2012-9789
- **Category:** airworthiness
- **Manufacturer:** Turbomeca S.A. Turboshaft
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 77 FR 24585
- **Publication date:** 2012-04-25
- **Effective date:** 2012-05-30
- **FAA docket:** Docket No. FAA-2012-0010
## Abstract

We are adopting a new airworthiness directive (AD) for all Turbomeca S.A. Arriel 2B and 2B1 turboshaft engines. This AD was prompted by the discovery of non-conformities of certain power turbine (PT) blade fir-tree roots. This AD requires removing the affected PT blades from service on or before reaching a new reduced life limit for those certain PT blades. We are issuing this AD to prevent PT blade rupture, which could result in an uncommanded in-flight engine shutdown, forced autorotation landing, or accident.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/04/25/2012-9789/airworthiness-directives-turbomeca-sa-turboshaft-engines)
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