# Proposed AD FAA-2009-1157: Rolls-Royce plc (RR) RB211-22B and RB211-524 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-17-10
- Products: Rolls-Royce
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 19, 2010, 75 FR 27964
- Comments due: July 6, 2010
- Became: [AD 2010-17-10](https://openairdocs.org/ad/2010-17-10)
- Docket: FAA-2009-1157 (https://www.regulations.gov/docket/FAA-2009-1157, where comments are filed)
- Project: 2009-NE-26-AD
- FR document: 2010-11998
- Official PDF: https://openairdocs.org/files/sha256/49/00/490004e56e953b141743899076ede4ab5b564ca12bdc704a69ffe3a48791957b (from https://www.govinfo.gov/content/pkg/FR-2010-05-19/pdf/2010-11998.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/05/19/2010-11998/airworthiness-directives-rolls-royce-plc-rr-rb211-22b-and-rb211-524-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C4528F35A5D769B186257728004E8BAA.0001
- Page: https://openairdocs.org/proposed/FAA-2009-1157

## 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: Several low pressure turbine (LPT) shafts have been found with cracks originating from the rear cooling air holes. The cracks were found at normal component overhaul, by the standard Magnetic Particle Inspection (MPI) technique defined in the associated engine manual. The cracks have been found to initiate from corrosion pits. Propagation of a crack from the rear cooling air holes may result in shaft failure and subsequently in an uncontained Low Pressure Turbine failure. For the reasons stated above, this AD requires the inspection of the affected engines' LPT shafts and replacement of the shaft, as necessary. We are proposing this AD to detect cracks, initiated by corrosion pits, originating from the rear cooling air holes, which could result in shaft failure and subsequently in an uncontained failure of the LPT and damage to the airplane.

## Notices in this docket

- May 19, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-11998, comments due Jul 6, 2010 (https://www.federalregister.gov/documents/2010/05/19/2010-11998/airworthiness-directives-rolls-royce-plc-rr-rb211-22b-and-rb211-524-series-turbofan-engines)

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