# Proposed AD FAA-2012-1131: Turbomeca S.A. Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-08-22
- Products: Turbomeca
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 11, 2012, 77 FR 73557
- Comments due: February 11, 2013
- Became: [AD 2013-08-22](https://openairdocs.org/ad/2013-08-22)
- Docket: FAA-2012-1131 (https://www.regulations.gov/docket/FAA-2012-1131, where comments are filed)
- Project: 2012-NE-34-AD
- FR document: 2012-29871
- Official PDF: https://openairdocs.org/files/sha256/48/b7/48b75cfbfe5d168d3c1e769370d02139e2109e6f6293d2d4bc3adda39d3659b0 (from https://www.govinfo.gov/content/pkg/FR-2012-12-11/pdf/2012-29871.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/12/11/2012-29871/airworthiness-directives-turbomeca-sa-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AB6479188883C04A86257AD1004D51DD.0001
- Page: https://openairdocs.org/proposed/FAA-2012-1131

## Summary

We propose to adopt a new airworthiness directive (AD) for certain 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 a finding that the engine's tachometer unit cycle counting feature is unreliable. This proposed AD would require daily post-flight checks of the engine tachometer's unit cycle counting feature. This proposed AD would also require ground-run functional checks within every 1,000 operating hours. This proposed AD was prompted by detailed analysis and review of the accuracy of the engine's tachometer cycle counting feature. We are proposing this AD to prevent uncontained engine failure and damage to the helicopter.

## Notices in this docket

- Dec 11, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-29871, comments due Feb 11, 2013 (https://www.federalregister.gov/documents/2012/12/11/2012-29871/airworthiness-directives-turbomeca-sa-turboshaft-engines)

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