# Proposed AD FAA-2009-0162: Rolls-Royce plc (RR) RB211-524 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-18-21
- Products: Rolls-Royce
- Product type: Engine
- Action: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period.
- Published: October 18, 2010, 75 FR 63727
- Comments due: December 17, 2010
- Became: [AD 2011-18-21](https://openairdocs.org/ad/2011-18-21)
- Docket: FAA-2009-0162 (https://www.regulations.gov/docket/FAA-2009-0162, where comments are filed)
- Project: 2004-NE-19-AD
- FR document: 2010-26115
- Official PDF: https://openairdocs.org/files/sha256/7c/fd/7cfdd093a45c4a03fc6494f05fbad806d307c88b2329ed9ddc6ba2c92220e00a (from https://www.govinfo.gov/content/pkg/FR-2010-10-18/pdf/2010-26115.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/10/18/2010-26115/airworthiness-directives-rolls-royce-plc-rr-rb211-524-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AACAB24A85F7A2FF862577C00056AA96.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0162

## Summary

This action revises an earlier proposed airworthiness directive (AD), applicable to certain RR RB211-524 series turbofan engines. That proposal would have required initial and repetitive borescope inspections of the head section and meterpanel assembly of the combustion liner, and replacement if necessary with serviceable parts. That proposal was prompted by an inquiry submitted by an operator, which resulted in RR performing a complete review of the affected front combustion liner part numbers (P/Ns). This action revises the proposed rule by clarifying the applicability paragraph (c) of the proposed AD. We are proposing this AD to prevent deterioration of the engine combustion liner, which can result in combustion liner breakup, case burn-through, engine fire, and damage to the airplane.

## Notices in this docket

- Mar 2, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-4317, comments due May 1, 2009 (https://www.federalregister.gov/documents/2009/03/02/E9-4317/airworthiness-directives-rolls-royce-plc-rr-rb211-524-series-turbofan-engines)
- Oct 18, 2010: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period., FR document 2010-26115, comments due Dec 17, 2010 (https://www.federalregister.gov/documents/2010/10/18/2010-26115/airworthiness-directives-rolls-royce-plc-rr-rb211-524-series-turbofan-engines)

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