# Proposed AD FAA-2006-23809: Turbomeca S.A. Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2014-12-05
- Products: Turbomeca
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 21, 2014, 79 FR 9868
- Comments due: April 22, 2014
- Became: [AD 2014-12-05](https://openairdocs.org/ad/2014-12-05)
- Docket: FAA-2006-23809 (https://www.regulations.gov/docket/FAA-2006-23809, where comments are filed)
- Project: 2005-NE-52-AD
- FR document: 2014-03673
- Official PDF: https://openairdocs.org/files/sha256/73/cc/73ccf64f0dc0f8dc7972e40c9cfe59a48b85551e61bcf42a8821742789378be2 (from https://www.govinfo.gov/content/pkg/FR-2014-02-21/pdf/2014-03673.pdf)
- Federal Register: https://www.federalregister.gov/documents/2014/02/21/2014-03673/airworthiness-directives-turbomeca-sa-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F0F577F7543263FE86257C86004C67CB.0001
- Page: https://openairdocs.org/proposed/FAA-2006-23809

## Summary

We propose to supersede airworthiness directive (AD) 2007-10- 07, which applies to all Turbomeca S.A. Arriel 2B, 2B1, and 2B1A turboshaft engines. AD 2007-10-07 currently requires an inspection of the splines of the coupling assembly and the hydro-mechanical metering unit (HMU) drive gear shaft for wear. This proposed AD would require the same inspection and expand the affected population. This proposed AD would also remove Arriel 2B1A engines from the applicability. We are proposing this AD to prevent failure of the HMU drive gear shaft, which could lead to damage to the engine and damage to the airplane.

## Notices in this docket

- Mar 9, 2006: Notice of proposed rulemaking (NPRM). (first notice), FR document E6-3352, comments due Apr 10, 2006 (https://www.federalregister.gov/documents/2006/03/09/E6-3352/airworthiness-directives-turbomeca-arriel-2b-series-turboshaft-engines)
- Feb 21, 2014: Notice of proposed rulemaking (NPRM)., FR document 2014-03673, comments due Apr 22, 2014 (https://www.federalregister.gov/documents/2014/02/21/2014-03673/airworthiness-directives-turbomeca-sa-turboshaft-engines)

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