# Proposed AD FAA-2010-0521: Rolls-Royce plc RB211-524C2 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-17-13
- Products: Rolls-Royce
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 19, 2010, 75 FR 27973
- Comments due: July 6, 2010
- Became: [AD 2010-17-13](https://openairdocs.org/ad/2010-17-13)
- Docket: FAA-2010-0521 (https://www.regulations.gov/docket/FAA-2010-0521, where comments are filed)
- Project: 2009-NE-21-AD
- FR document: 2010-11997
- Official PDF: https://openairdocs.org/files/sha256/72/04/7204599fac38c5239d1342762f2459ba3da5690586adbd08cd4da4676079f7fa (from https://www.govinfo.gov/content/pkg/FR-2010-05-19/pdf/2010-11997.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/05/19/2010-11997/airworthiness-directives-rolls-royce-plc-rb211-524c2-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EA35B36F7C3B5F5E862577280052EA25.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0521

## 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: A number of LPT casings have been found cracked during engine shop visit. Cracking of the LPT casing reduces the capability of the casing to contain debris in the event of an LPT stage 1 blade failure. Therefore, blade failure in an engine featuring a cracked LPT casing may result in release of uncontained high energy debris. For the reason described above, this AD requires repetitive inspections and corrective actions, depending on findings. We are proposing this AD to detect cracks in the LPT casings, which could result in the release of uncontained high-energy debris in the event of a stage 1 blade failure. Uncontained high-energy debris could result in damage to the airplane.

## Notices in this docket

- May 19, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-11997, comments due Jul 6, 2010 (https://www.federalregister.gov/documents/2010/05/19/2010-11997/airworthiness-directives-rolls-royce-plc-rb211-524c2-series-turbofan-engines)

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