# Proposed AD FAA-2011-0961: Rolls-Royce Corporation Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-14-06
- Products: Rolls-Royce
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 29, 2017, 82 FR 15474
- Comments due: May 15, 2017
- Became: [AD 2012-14-06](https://openairdocs.org/ad/2012-14-06)
- Docket: FAA-2011-0961 (https://www.regulations.gov/docket/FAA-2011-0961, where comments are filed)
- Project: 2011-NE-22-AD
- FR document: 2017-06174
- Official PDF: https://openairdocs.org/files/sha256/89/3d/893dd7e2b7d127d5980fb631ea2d791d6be4a1b2f718a524d0e9af5ceaf3837b (from https://www.govinfo.gov/content/pkg/FR-2017-03-29/pdf/2017-06174.pdf)
- Federal Register: https://www.federalregister.gov/documents/2017/03/29/2017-06174/airworthiness-directives-rolls-royce-corporation-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7E1EE5B7E5392843862580F300495857.0001
- Page: https://openairdocs.org/proposed/FAA-2011-0961

## Summary

We propose to supersede Airworthiness Directive (AD) 2015-02- 22, which applies to certain Rolls-Royce Corporation (RRC) model 250 turboprop and turboshaft engines. AD 2015-02-22 currently requires repetitive visual inspections and fluorescent-penetrant inspection (FPIs) on certain 3rd-stage and 4th-stage turbine wheels for cracks in the turbine wheel blades. Since we issued AD 2015-02-22, we determined that it is necessary to remove the 4th-stage wheels at the next inspection. We are also proposing to revise the applicability to remove all RRC turboprop engines and add additional turboshaft engines. This proposed AD would require repetitive visual inspections and FPIs of 3rd-stage turbine wheels while removing from service 4th-stage turbine wheels. We are proposing this AD to correct the unsafe condition on these products.

## Notices in this docket

- Dec 20, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-32491, comments due Feb 21, 2012 (https://www.federalregister.gov/documents/2011/12/20/2011-32491/airworthiness-directives-rolls-royce-corporation-turboshaft-engines)
- Oct 2, 2014: Notice of proposed rulemaking (NPRM)., FR document 2014-23553, comments due Dec 1, 2014 (https://www.federalregister.gov/documents/2014/10/02/2014-23553/airworthiness-directives-rolls-royce-corporation-turboprop-and-turboshaft-engines)
- Mar 29, 2017: Notice of proposed rulemaking (NPRM)., FR document 2017-06174, comments due May 15, 2017 (https://www.federalregister.gov/documents/2017/03/29/2017-06174/airworthiness-directives-rolls-royce-corporation-turboshaft-engines)

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