# Airworthiness Directives; Safran Helicopter Engines, S.A. (Type Certificate Previously Held by Turbomeca, S.A.) Turboshaft Engines
> **Rule** · Final rule. · Published 2021-07-15 · Effective 2021-08-19 · 86 FR 37229
## Document
- **Document number:** 2021-15041
- **Category:** airworthiness
- **Manufacturer:** Safran Helicopter
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 37229
- **Publication date:** 2021-07-15
- **Effective date:** 2021-08-19
- **FAA docket:** Docket No. FAA-2021-0100
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Safran Helicopter Engines, S.A. Arriel 2C and Arriel 2S1 model turboshaft engines. This AD was prompted by reports of error messages on the full authority digital engine control (FADEC) B digital engine control unit (DECU), caused by blistering of the varnish on the DECU circuit board. This AD requires the replacement of certain FADEC B DECUs. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/07/15/2021-15041/airworthiness-directives-safran-helicopter-engines-sa-type-certificate-previously-held-by-turbomeca)
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