# Proposed AD 2003-NE-12-AD: Rolls-Royce plc RB211 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2004-01-20
- Products: Rolls-Royce
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 28, 2005, 70 FR 43659
- Comments due: September 26, 2005
- Became: [AD 2004-01-20](https://openairdocs.org/ad/2004-01-20)
- Docket: 2003-NE-12-AD
- FR document: 05-14803
- Official PDF: https://openairdocs.org/files/sha256/39/ac/39acb28153126325d30a88e4589a4364bd29584743ab6de7fd4a8f61f883384d (from https://www.govinfo.gov/content/pkg/FR-2005-07-28/pdf/05-14803.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/07/28/05-14803/airworthiness-directives-rolls-royce-plc-rb211-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C1648152F06EFD3C8625704C0056875E.0001
- Page: https://openairdocs.org/proposed/2003-NE-12-AD

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) for Rolls-Royce plc (RR) RB211-22B series, RB211-524B, - 524C2, -524D4, -524G2, -524G3, and -524H series, and RB211-535C and - 535E series turbofan engines with high pressure compressor (HPC) stage 3 disc assemblies, part numbers (P/Ns) LK46210, LK58278, LK67634, LK76036, UL11706, UL15358, UL22577, UL22578, and UL24738 installed. That AD requires removing from service certain disc assemblies before they reach their full life if not modified with anticorrosion protection. This proposed AD would require the same actions as AD 2004- 01-20, but would shorten the compliance time for disks that entered service before 1990. This proposed AD results from the manufacturer's reassessment of the corrosion risk on HPC stage 3 disc assemblies not modified with sufficient application of anticorrosion protection. We are issuing this AD to prevent corrosion-induced uncontained disc failure, resulting in damage to the airplane.

## Notices in this docket

- Jul 30, 2003: Notice of proposed rulemaking (NPRM). (first notice), FR document 03-19310, comments due Sep 29, 2003 (https://www.federalregister.gov/documents/2003/07/30/03-19310/airworthiness-directives-rolls-royce-plc)
- Jul 28, 2005: Notice of proposed rulemaking (NPRM)., FR document 05-14803, comments due Sep 26, 2005 (https://www.federalregister.gov/documents/2005/07/28/05-14803/airworthiness-directives-rolls-royce-plc-rb211-series-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.