# Proposed AD FAA-2021-0137: Safran Helicopter Engines, S.A. (Type Certificate Previously Held by Turbomeca, S.A.) Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-17-05
- Products: Safran Helicopter Engines
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 12, 2021, 86 FR 14017
- Comments due: April 26, 2021
- Became: [AD 2021-17-05](https://openairdocs.org/ad/2021-17-05)
- Docket: FAA-2021-0137 (https://www.regulations.gov/docket/FAA-2021-0137, where comments are filed)
- Project: MCAI-2020-00269-E
- FR document: 2021-05047
- Official PDF: https://openairdocs.org/files/sha256/ec/f5/ecf513fb6fa5ac5b48d73ca4c4c39b4b735dc84498f45bb7c5f6b28417e3808b (from https://www.govinfo.gov/content/pkg/FR-2021-03-12/pdf/2021-05047.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/03/12/2021-05047/airworthiness-directives-safran-helicopter-engines-sa-type-certificate-previously-held-by-turbomeca
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A8C15F1DBABAD55186258696004C17EF.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0137

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2014-04-06, which applies to all Safran Helicopter Engines, S.A. (Safran Helicopter Engines) Arrius 2B1, 2B1A, 2B2, and 2K1 model turboshaft engines. AD 2014-04-06 requires initial and repetitive inspections of the hydro-mechanical metering unit (HMU) high pressure pump drive gear shaft splines, cleaning and inspections of the sleeve assembly splines, and replacement of the sleeve assembly on the affected high pressure pump drive gear shaft or replacement of the HMU if the HMU fails inspection. Since the FAA issued AD 2014-04-06, the manufacturer has published new service information that revises the inspections for certain HMUs and reduces compliance times for initial inspections. This proposed AD would require revised inspections and continue to require cleaning of the sleeve assembly splines, and replacement of the sleeve assembly on the affected high pressure pump drive gear shaft or replacement of the HMU if the HMU fails an inspection. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Mar 12, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-05047, comments due Apr 26, 2021 (https://www.federalregister.gov/documents/2021/03/12/2021-05047/airworthiness-directives-safran-helicopter-engines-sa-type-certificate-previously-held-by-turbomeca)

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