# Proposed AD FAA-2010-0364: Rolls-Royce plc RB211 Trent 700 and Trent 800 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-20-11
- Products: Rolls-Royce
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 7, 2010, 75 FR 17630
- Comments due: May 24, 2010
- Became: [AD 2010-20-11](https://openairdocs.org/ad/2010-20-11)
- Docket: FAA-2010-0364 (https://www.regulations.gov/docket/FAA-2010-0364, where comments are filed)
- Project: 2009-NE-27-AD
- FR document: 2010-7830
- Official PDF: https://openairdocs.org/files/sha256/01/7c/017cbba99b7fb9b47a4686cddd5c8240b7fdda5291d4cb4bcf54ab8b38c58938 (from https://www.govinfo.gov/content/pkg/FR-2010-04-07/pdf/2010-7830.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/04/07/2010-7830/airworthiness-directives-rolls-royce-plc-rb211-trent-700-and-trent-800-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/975BFE5D18F9E9C1862576FE004C9D50.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0364

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: In completing a review of Engine Manual repair/acceptance limits for titanium compressor shafts, Rolls-Royce has found the specified limits to be incorrect such that the shot peened surface layer at life critical features (the axial dovetail slots) may have been inadvertently removed in-service. Removal of the shot peened layer results in increased vulnerability of the part to tensile stresses, which could reduce the life of the shaft to below the published life limits. We are proposing this AD to prevent failure of the intermediate- pressure (IP) and high-pressure (HP) shaft, which could result in an overspeed condition, possible uncontained discfailure and damage to the airplane.

## Notices in this docket

- Apr 7, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-7830, comments due May 24, 2010 (https://www.federalregister.gov/documents/2010/04/07/2010-7830/airworthiness-directives-rolls-royce-plc-rb211-trent-700-and-trent-800-series-turbofan-engines)

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