# Proposed AD FAA-2020-0687: Rolls-Royce Corporation (Type Certificate Previously Held by Allison Engine Company) Turboprop Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2020-22-18
- Products: Rolls-Royce
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 11, 2020, 85 FR 48482
- Comments due: September 25, 2020
- Became: [AD 2020-22-18](https://openairdocs.org/ad/2020-22-18)
- Docket: FAA-2020-0687 (https://www.regulations.gov/docket/FAA-2020-0687, where comments are filed)
- Project: AD-2020-00571-E
- FR document: 2020-17389
- Official PDF: https://openairdocs.org/files/sha256/50/4d/504d82a7f55f350938c28e01339f5857700b50a4a6407e3785f2c9f42d3b8c70 (from https://www.govinfo.gov/content/pkg/FR-2020-08-11/pdf/2020-17389.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/08/11/2020-17389/airworthiness-directives-rolls-royce-corporation-type-certificate-previously-held-by-allison-engine
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5A3D8283A864C015862585C1003F2149.0001
- Page: https://openairdocs.org/proposed/FAA-2020-0687

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Rolls-Royce Corporation (RRC) AE 2100A, AE 2100D2, AE 2100D2A, and AE 2100P model turboprop engines. This proposed AD was prompted by a report of a propeller gearbox (PGB) development test conducted by the manufacturer, in which high vibration occurred due to a fatigue crack that initiated in the PGB shaft and carrier assembly. This proposed AD would require assignment of usage hours to the PGB shaft and carrier assembly at the next engine shop visit and replacement of PGB shaft and carrier assemblies prior to exceeding the new life limits established by the manufacturer. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Aug 11, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-17389, comments due Sep 25, 2020 (https://www.federalregister.gov/documents/2020/08/11/2020-17389/airworthiness-directives-rolls-royce-corporation-type-certificate-previously-held-by-allison-engine)

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