# Proposed AD FAA-2015-8257: Turbomeca S.A. Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-12-06
- Products: Turbomeca
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 11, 2016, 81 FR 12834
- Comments due: May 10, 2016
- Became: [AD 2016-12-06](https://openairdocs.org/ad/2016-12-06)
- Docket: FAA-2015-8257 (https://www.regulations.gov/docket/FAA-2015-8257, where comments are filed)
- Project: 2015-NE-36-AD
- FR document: 2016-05465
- Official PDF: https://openairdocs.org/files/sha256/35/b0/35b043e69e5e2557de969fdf4e816f99cbe0b33def8d9d87af65b5e62fa6bcf0 (from https://www.govinfo.gov/content/pkg/FR-2016-03-11/pdf/2016-05465.pdf)
- Federal Register: https://www.federalregister.gov/documents/2016/03/11/2016-05465/airworthiness-directives-turbomeca-sa-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E04D039332EF402E86257F730050D67C.0001
- Page: https://openairdocs.org/proposed/FAA-2015-8257

## Summary

We propose to adopt a new airworthiness directive (AD) for all Turbomeca S.A. MAKILA 2A and MAKILA 2A1 turboshaft engines. This proposed AD was prompted by two occurrences of crack initiation on a ferrule of the diffuser. This proposed AD would require repetitive diffuser inspections and replacement of those diffusers that fail inspection. We are proposing this AD to prevent rupture of the ferrule of the diffuser, which could result in engine fire and damage to the helicopter.

## Notices in this docket

- Mar 11, 2016: Notice of proposed rulemaking (NPRM). (first notice), FR document 2016-05465, comments due May 10, 2016 (https://www.federalregister.gov/documents/2016/03/11/2016-05465/airworthiness-directives-turbomeca-sa-turboshaft-engines)

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