# Proposed AD FAA-2012-0901: Turbomeca S.A. Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-27-02
- Products: Turbomeca
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 13, 2012, 77 FR 56585
- Comments due: November 13, 2012
- Became: [AD 2012-27-02](https://openairdocs.org/ad/2012-27-02)
- Docket: FAA-2012-0901 (https://www.regulations.gov/docket/FAA-2012-0901, where comments are filed)
- Project: 2012-NE-19-AD
- FR document: 2012-22530
- Official PDF: https://openairdocs.org/files/sha256/33/55/3355ca5bcc71cd1ef1d36392c700656730fe0a549373dbcd14e2fc5daa36644d (from https://www.govinfo.gov/content/pkg/FR-2012-09-13/pdf/2012-22530.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/09/13/2012-22530/airworthiness-directives-turbomeca-sa-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/52591A633C182E9786257A780048433B.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0901

## Summary

We propose to adopt a new airworthiness directive (AD) for all Turbomeca S.A. Arriel 1A1, 1A2, 1B, 1C, 1C1, 1C2, 1D, 1D1, 1E2, 1K1, 1S, and 1S1 turboshaft engines. This proposed AD was prompted by several reports of uncommanded in-flight shutdown (IFSD) on Arriel 1 engines. This proposed AD would require performing a high gas generator speed (NG) rating vibration check. We are proposing this AD to prevent an uncommanded in-flight shut-down of the engine, which could result in an emergency landing.

## Notices in this docket

- Sep 13, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-22530, comments due Nov 13, 2012 (https://www.federalregister.gov/documents/2012/09/13/2012-22530/airworthiness-directives-turbomeca-sa-turboshaft-engines)

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