# Proposed AD FAA-2012-0482: Rolls-Royce plc Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-25-09
- Products: Rolls-Royce
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 11, 2012, 77 FR 40820
- Comments due: September 10, 2012
- Became: [AD 2012-25-09](https://openairdocs.org/ad/2012-25-09)
- Docket: FAA-2012-0482 (https://www.regulations.gov/docket/FAA-2012-0482, where comments are filed)
- Project: 2012-NE-14-AD
- FR document: 2012-16856
- Official PDF: https://openairdocs.org/files/sha256/3a/70/3a70095410b70684e9fa6c03e17824309acc80106ea34283345ee2cd81e32770 (from https://www.govinfo.gov/content/pkg/FR-2012-07-11/pdf/2012-16856.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/07/11/2012-16856/airworthiness-directives-rolls-royce-plc-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/37761DD88531DC7786257A38004E7A2C.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0482

## Summary

We propose to adopt a new airworthiness directive (AD) for all Rolls-Royce plc (RR) RB211-524G2-19; RB211-524G2-T-19; RB211-524G3-19; RB211-524G3-T-19; RB211-524H2-19; RB211-524H2-T-19; RB211-524H-36; RB211-524H-T-36; RB211-535E4-37; RB211-535E4-B-37; RB211-535E4-B-75; and RB211-535E4-C-37 turbofan engines. This proposed AD was prompted by an investigation by RR concluding that certain intermediate-pressure (IP) turbine discs produced before 1997 by a certain supplier may contain steel inclusions. This proposed AD would require removal of the affected IP turbine discs to inspect them for steel inclusions, and removal from service if the discs fail the inspection. This proposed AD would also require removal from service of some IP turbine discs at reduced life limits. We are proposing this AD to prevent uncontained IP turbine disc failure, engine failure, and damage to the airplane.

## Notices in this docket

- Jul 11, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-16856, comments due Sep 10, 2012 (https://www.federalregister.gov/documents/2012/07/11/2012-16856/airworthiness-directives-rolls-royce-plc-turbofan-engines)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.