# Proposed AD FAA-2015-4076: Rolls-Royce plc Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-08-07
- Products: Rolls-Royce
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 9, 2015, 80 FR 76402
- Comments due: February 8, 2016
- Became: [AD 2016-08-07](https://openairdocs.org/ad/2016-08-07)
- Docket: FAA-2015-4076 (https://www.regulations.gov/docket/FAA-2015-4076, where comments are filed)
- Project: 2015-NE-30-AD
- FR document: 2015-30947
- Official PDF: https://openairdocs.org/files/sha256/ab/3c/ab3c549ff4562a24302d40a55ff9e29c4df72fcef5e510b6124bf21fc89af503 (from https://www.govinfo.gov/content/pkg/FR-2015-12-09/pdf/2015-30947.pdf)
- Federal Register: https://www.federalregister.gov/documents/2015/12/09/2015-30947/airworthiness-directives-rolls-royce-plc-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A69D1DBC33F10D5486257F16005794A3.0001
- Page: https://openairdocs.org/proposed/FAA-2015-4076

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Rolls-Royce plc (RR) RB211-22B and RB211-524 turbofan engines with low-pressure turbine (LPT) support roller bearing, part number (P/ N) LK30313 or P/N UL29651, installed. This proposed AD was prompted by a report of a breach of the turbine casing and release of engine debris. This proposed AD would require removal of certain LPT support roller bearings installed in RR RB211-22B and RB211-524 engines. We are proposing this AD to prevent failure of the LPT support roller bearing, loss of radial position following LPT blade failure, uncontained part release, damage to the engine, and damage to the airplane.

## Notices in this docket

- Dec 9, 2015: Notice of proposed rulemaking (NPRM). (first notice), FR document 2015-30947, comments due Feb 8, 2016 (https://www.federalregister.gov/documents/2015/12/09/2015-30947/airworthiness-directives-rolls-royce-plc-turbofan-engines)

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