# Proposed AD FAA-2012-0010: Turbomeca S.A. Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-08-18
- Products: Turbomeca
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 20, 2012, 77 FR 2930
- Comments due: March 20, 2012
- Became: [AD 2012-08-18](https://openairdocs.org/ad/2012-08-18)
- Docket: FAA-2012-0010 (https://www.regulations.gov/docket/FAA-2012-0010, where comments are filed)
- Project: 2012-NE-03-AD
- FR document: 2012-1129
- Official PDF: https://openairdocs.org/files/sha256/90/fb/90fb7314e70b81c6bd02c19cbc0cf283a7234cac6408bd92d60952621f423df7 (from https://www.govinfo.gov/content/pkg/FR-2012-01-20/pdf/2012-1129.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/01/20/2012-1129/airworthiness-directives-turbomeca-sa-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5E541686DD9FFE338625798B004E964D.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0010

## Summary

We propose to adopt a new airworthiness directive (AD) for all Turbomeca S.A. Arriel 2B and 2B1 turboshaft engines. This proposed AD was prompted by the discovery of non-conformities of certain power turbine (PT) blade fir-tree roots. This proposed AD would require removing the affected PT blades from service on or before reaching a new reduced life limit for those certain PT blades. We are proposing this AD to prevent PT blade rupture, which could result in an uncommanded in-flight engine shutdown, forced autorotation landing, or accident.

## Notices in this docket

- Jan 20, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-1129, comments due Mar 20, 2012 (https://www.federalregister.gov/documents/2012/01/20/2012-1129/airworthiness-directives-turbomeca-sa-turboshaft-engines)

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