# Proposed AD FAA-2010-0994: Rolls-Royce plc (RR) RB211-535 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-11-08
- Products: Rolls-Royce
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 5, 2010, 75 FR 61361
- Comments due: November 19, 2010
- Became: [AD 2011-11-08](https://openairdocs.org/ad/2011-11-08)
- Docket: FAA-2010-0994 (https://www.regulations.gov/docket/FAA-2010-0994, where comments are filed)
- Project: 2009-NE-39-AD
- FR document: 2010-24887
- Official PDF: https://openairdocs.org/files/sha256/eb/c9/ebc917bf7fb4b8f9cd04fefc2a190db83f919396541009930571c93a0e8a838c (from https://www.govinfo.gov/content/pkg/FR-2010-10-05/pdf/2010-24887.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/10/05/2010-24887/airworthiness-directives-rolls-royce-plc-rr-rb211-535-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3E2563622DD2612A862577B30055DACB.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0994

## 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:

There have been several findings of cracking at the firtrees of LP Turbine discs. Fatigue crack initiation and subsequent crack propagation at the firtree may result in multiple LP Turbine blade release. The latter may potentially be beyond the containment capabilities of the engine casings. Thus, cracking at the firtrees of LP Turbine discs constitutes a potentially unsafe condition.

We are proposing this AD to detect cracks in the low-pressure turbine stage 1, 2, and 3 discs, which could result in an uncontained release of LP turbine blades and damage to the airplane.

## Notices in this docket

- Oct 5, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-24887, comments due Nov 19, 2010 (https://www.federalregister.gov/documents/2010/10/05/2010-24887/airworthiness-directives-rolls-royce-plc-rr-rb211-535-series-turbofan-engines)

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