# Proposed AD FAA-2021-1071: Rolls-Royce Corporation Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2022-10-06
- Products: Rolls-Royce
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 14, 2022, 87 FR 2365
- Comments due: February 28, 2022
- Became: [AD 2022-10-06](https://openairdocs.org/ad/2022-10-06)
- Docket: FAA-2021-1071 (https://www.regulations.gov/docket/FAA-2021-1071, where comments are filed)
- Project: AD-2021-01055-E
- FR document: 2022-00232
- Official PDF: https://openairdocs.org/files/sha256/c1/54/c154a399b2108dd99eb6f7e7e4dbc2fdd205dcb0c5aa29364d858fd07be0633c (from https://www.govinfo.gov/content/pkg/FR-2022-01-14/pdf/2022-00232.pdf)
- Federal Register: https://www.federalregister.gov/documents/2022/01/14/2022-00232/airworthiness-directives-rolls-royce-corporation-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2022-00232-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2021-1071

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2017-18-14, which applies to certain Rolls-Royce Corporation (RRC) 250 model turboshaft engines. AD 2017-18-14 requires repetitive visual inspections and fluorescent penetrant inspections (FPIs) of the 3rd- stage turbine wheel and removal from service of the 4th-stage turbine wheel. Since the FAA issued AD 2017-18-14, the manufacturer redesigned the 3rd-stage turbine wheel. This proposed AD would require replacement of the 3rd-stage and 4th-stage turbine wheels. This proposed AD would also revise the applicability to add an additional turboshaft engine model. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jan 14, 2022: Notice of proposed rulemaking (NPRM). (first notice), FR document 2022-00232, comments due Feb 28, 2022 (https://www.federalregister.gov/documents/2022/01/14/2022-00232/airworthiness-directives-rolls-royce-corporation-turboshaft-engines)

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