# Airworthiness Directives; Turbomeca S.A. Turboshaft Engines
> **Rule** · Final rule. · Published 2016-04-20 · Effective 2016-05-25 · 81 FR 23155
## Document
- **Document number:** 2016-09121
- **Category:** airworthiness
- **Manufacturer:** Turbomeca S.A. Turboshaft
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 81 FR 23155
- **Publication date:** 2016-04-20
- **Effective date:** 2016-05-25
- **FAA docket:** Docket No. FAA-2015-5539
## Abstract

We are adopting a new airworthiness directive (AD) for all Turbomeca S.A. Arriel 2E turboshaft engines. This AD requires removing the pre-TU 193 adjusted high-pressure/low-pressure pump and metering valve assembly and replacing it with a part that is eligible for installation. This AD also requires replacing the constant delta- pressure (delta-P) diaphragm of the fuel metering valve. This AD was prompted by reports of fuel flow non-conformities found during acceptance tests of Arriel 2E hydro-mechanical metering units (HMUs). We are issuing this AD to prevent failure of the delta-P diaphragm, which could result in an uncommanded in-flight shutdown and damage to the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2016/04/20/2016-09121/airworthiness-directives-turbomeca-sa-turboshaft-engines)
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