# Proposed AD FAA-2012-0057: Turbomeca S.A. Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-12-20
- Products: Turbomeca
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 21, 2012, 77 FR 9874
- Comments due: April 23, 2012
- Became: [AD 2012-12-20](https://openairdocs.org/ad/2012-12-20)
- Docket: FAA-2012-0057 (https://www.regulations.gov/docket/FAA-2012-0057, where comments are filed)
- Project: 2012-NE-04-AD
- FR document: 2012-3860
- Official PDF: https://openairdocs.org/files/sha256/c6/84/c6840f64a7fbe58c7f8a2e41ad14592e376744e826a266ba82a864c361712c74 (from https://www.govinfo.gov/content/pkg/FR-2012-02-21/pdf/2012-3860.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/02/21/2012-3860/airworthiness-directives-turbomeca-sa-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6D0608CE5DE2C6F4862579AB0050FBA4.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0057

## Summary

We propose to adopt a new airworthiness directive (AD) for Turbomeca S.A. Arriel 2C1, 2C2, and 2S2 turboshaft engines. This proposed AD was prompted by a report of a helicopter experiencing a digital engine control unit (DECU) malfunction during flight. We are proposing this AD to prevent loss of automatic control on one or both engines installed on the same helicopter, which could result in an uncommanded in-flight engine shutdown, forced autorotation landing, or accident.

## Notices in this docket

- Feb 21, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-3860, comments due Apr 23, 2012 (https://www.federalregister.gov/documents/2012/02/21/2012-3860/airworthiness-directives-turbomeca-sa-turboshaft-engines)

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