# Proposed AD FAA-2015-4070: Turbomeca S.A. Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-04-14
- Products: Turbomeca
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 24, 2015, 80 FR 73147
- Comments due: January 25, 2016
- Became: [AD 2016-04-14](https://openairdocs.org/ad/2016-04-14)
- Docket: FAA-2015-4070 (https://www.regulations.gov/docket/FAA-2015-4070, where comments are filed)
- Project: 2015-NE-31-AD
- FR document: 2015-29748
- Official PDF: https://openairdocs.org/files/sha256/02/a5/02a542f4499c593edd4c87607d3e6c42bf7a6a8103eebbcf3a2cd01edc2cb3bb (from https://www.govinfo.gov/content/pkg/FR-2015-11-24/pdf/2015-29748.pdf)
- Federal Register: https://www.federalregister.gov/documents/2015/11/24/2015-29748/airworthiness-directives-turbomeca-sa-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/000253DC1D324DFE86257F070051F629.0001
- Page: https://openairdocs.org/proposed/FAA-2015-4070

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Turbomeca S.A. Arriel 1E2 turboshaft engines. This proposed AD was prompted by reports of uncommanded in-flight shutdowns (IFSDs). This proposed AD would require removing the tachometer box on affected engines. We are proposing this AD to prevent failure of the tachometer box, which could lead to failure of the engine, IFSD, and loss of control of the helicopter.

## Notices in this docket

- Nov 24, 2015: Notice of proposed rulemaking (NPRM). (first notice), FR document 2015-29748, comments due Jan 25, 2016 (https://www.federalregister.gov/documents/2015/11/24/2015-29748/airworthiness-directives-turbomeca-sa-turboshaft-engines)

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