# Proposed AD FAA-2017-1118: Rolls-Royce Corporation Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2018-13-01
- Products: Rolls-Royce
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 1, 2018, 83 FR 4609
- Comments due: March 19, 2018
- Became: [AD 2018-13-01](https://openairdocs.org/ad/2018-13-01)
- Docket: FAA-2017-1118 (https://www.regulations.gov/docket/FAA-2017-1118, where comments are filed)
- FR document: 2018-01900
- Official PDF: https://openairdocs.org/files/sha256/b9/8b/b98b39ecc39e7a4e0267017e8e600cd646aa2024c8f3cd1c4cefbe38a7593e50 (from https://www.govinfo.gov/content/pkg/FR-2018-02-01/pdf/2018-01900.pdf)
- Federal Register: https://www.federalregister.gov/documents/2018/02/01/2018-01900/airworthiness-directives-rolls-royce-corporation-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9388428C45A6774A86258227005284F6.0001
- Page: https://openairdocs.org/proposed/FAA-2017-1118

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Rolls-Royce Corporation (RRC) model 250-C turboshaft engines. This proposed AD was prompted by several reports of engine power loss, one of which resulted in a fatal helicopter accident. This proposed AD would require removal of the bearing assembly, part number (P/N) 2544198, in the power turbine governor (PTG) and its replacement with a bearing assembly eligible for installation. We are proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Feb 1, 2018: Notice of proposed rulemaking (NPRM). (first notice), FR document 2018-01900, comments due Mar 19, 2018 (https://www.federalregister.gov/documents/2018/02/01/2018-01900/airworthiness-directives-rolls-royce-corporation-turboshaft-engines)

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