# Proposed AD FAA-2012-1327: Rolls-Royce plc Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-12-01
- Products: Rolls-Royce
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 1, 2016, 81 FR 75762
- Comments due: December 16, 2016
- Became: [AD 2013-12-01](https://openairdocs.org/ad/2013-12-01)
- Docket: FAA-2012-1327 (https://www.regulations.gov/docket/FAA-2012-1327, where comments are filed)
- Project: 2012-NE-47-AD
- FR document: 2016-26334
- Official PDF: https://openairdocs.org/files/sha256/a7/6f/a76f28a9942ae93f3a54abfbc688ae4565615388a39cf0deb7c44d13ed6e7fdd (from https://www.govinfo.gov/content/pkg/FR-2016-11-01/pdf/2016-26334.pdf)
- Federal Register: https://www.federalregister.gov/documents/2016/11/01/2016-26334/airworthiness-directives-rolls-royce-plc-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A719D878CD5A17468625805E005442B4.0001
- Page: https://openairdocs.org/proposed/FAA-2012-1327

## Summary

We propose to supersede airworthiness directive (AD) 2014-16-10 that applies to all Rolls-Royce plc (RR) RB211 Trent 768-60, 772-60, and 772B-60 turbofan engines. AD 2014-16-10 requires initial and repetitive ultrasonic inspections (UIs) of the affected low-pressure (LP) compressor blades. Since we issued AD 2014-16-10, RR issued revised service information to reduce the inspection threshold. This proposed AD would retain the UIs in AD 2014-16-10 while applying the revised inspection threshold. We are proposing this AD to prevent LP compressor blade airfoil separations, damage to the engine, and damage to the airplane.

## Notices in this docket

- Jan 31, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-02077, comments due Apr 1, 2013 (https://www.federalregister.gov/documents/2013/01/31/2013-02077/airworthiness-directives-rolls-royce-plc-turbofan-engines)
- May 23, 2014: Notice of proposed rulemaking (NPRM)., FR document 2014-11919, comments due Jul 22, 2014 (https://www.federalregister.gov/documents/2014/05/23/2014-11919/airworthiness-directives-rolls-royce-plc-turbofan-engines)
- Nov 1, 2016: Notice of proposed rulemaking (NPRM)., FR document 2016-26334, comments due Dec 16, 2016 (https://www.federalregister.gov/documents/2016/11/01/2016-26334/airworthiness-directives-rolls-royce-plc-turbofan-engines)

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