# Proposed AD FAA-2014-0904: Rolls-Royce plc Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2015-07-01
- Products: Rolls-Royce
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 2, 2014, 79 FR 71363
- Comments due: February 2, 2015
- Became: [AD 2015-07-01](https://openairdocs.org/ad/2015-07-01)
- Docket: FAA-2014-0904 (https://www.regulations.gov/docket/FAA-2014-0904, where comments are filed)
- Project: 2014-NE-14-AD
- FR document: 2014-28339
- Official PDF: https://openairdocs.org/files/sha256/93/66/9366ea1e91b1449645ed2d19d24364bf16eb957b672a8dc9d4590de50df1daa6 (from https://www.govinfo.gov/content/pkg/FR-2014-12-02/pdf/2014-28339.pdf)
- Federal Register: https://www.federalregister.gov/documents/2014/12/02/2014-28339/airworthiness-directives-rolls-royce-plc-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D4F90DC2AE54448E86257DA20050C45D.0001
- Page: https://openairdocs.org/proposed/FAA-2014-0904

## Summary

We propose to adopt a new airworthiness directive (AD) for all Rolls-Royce plc (RR) RB211-524 turbofan engines with certain part number (P/N) low-pressure turbine (LPT) stage 3 turbine blades installed. This proposed AD was prompted by reports of LPT stage 3 turbine blade failures, release of blades, and subsequent in-flight shutdowns. This proposed AD would require implementation of a life limit for certain P/N LPT stage 3 turbine blades and replacement of affected blades that reach or exceed the life limit. We are proposing this AD to prevent failure of LPT stage 3 turbine blades and subsequent release of blade debris, which could lead to failure of one or more engines, loss of thrust control, and damage to the airplane.

## Notices in this docket

- Dec 2, 2014: Notice of proposed rulemaking (NPRM). (first notice), FR document 2014-28339, comments due Feb 2, 2015 (https://www.federalregister.gov/documents/2014/12/02/2014-28339/airworthiness-directives-rolls-royce-plc-turbofan-engines)

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