# Airworthiness Directives; Turbomeca S.A. Turboshaft Engines
> **Rule** · Final rule. · Published 2013-01-31 · Effective 2013-03-07 · 78 FR 6725
## Document
- **Document number:** 2013-02032
- **Category:** airworthiness
- **Manufacturer:** Turbomeca S.A. Turboshaft
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 78 FR 6725
- **Publication date:** 2013-01-31
- **Effective date:** 2013-03-07
- **FAA docket:** Docket No. FAA-2012-0940
## Abstract

We are adopting a new airworthiness directive (AD) for Turbomeca S.A. Arriel 2D turboshaft engines. This AD was prompted by a low fuel pressure event caused by deterioration and a loss of the low- pressure drive function within the hydro-mechanical metering unit (HMU). This AD requires replacing the HMU at a reduced life. We are issuing this AD to prevent an uncommanded in-flight shutdown of the engine, and possible loss of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/01/31/2013-02032/airworthiness-directives-turbomeca-sa-turboshaft-engines)
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