# Proposed AD FAA-2012-1202: Rolls-Royce Deutschland Ltd & Co KG (Formerly Rolls-Royce Deutschland GmbH, Formerly BMW Rolls-Royce GmbH) Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-26-14
- Products: Rolls-Royce Deutschland
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 19, 2013, 78 FR 69316
- Comments due: January 21, 2014
- Became: [AD 2012-26-14](https://openairdocs.org/ad/2012-26-14)
- Docket: FAA-2012-1202 (https://www.regulations.gov/docket/FAA-2012-1202, where comments are filed)
- Project: 2012-NE-38-AD
- FR document: 2013-27633
- Official PDF: https://openairdocs.org/files/sha256/f5/c7/f5c7ec239b2a970bfda93ef2b8bd2a0c6353a3fc006feeb9aa47b4b25a8fb3c1 (from https://www.govinfo.gov/content/pkg/FR-2013-11-19/pdf/2013-27633.pdf)
- Federal Register: https://www.federalregister.gov/documents/2013/11/19/2013-27633/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-formerly-rolls-royce-deutschland-gmbh
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/89F7753CF393044586257C28004C5A09.0001
- Page: https://openairdocs.org/proposed/FAA-2012-1202

## Summary

We propose to supersede existing airworthiness directive (AD) 2012-26-14 that applies to all Rolls-Royce Deutschland Ltd & Co KG (RRD) BR700-715A1-30, BR700-715B1-30, and BR700-715C1-30 turbofan engines. AD 2012-26-14 currently requires removal from service of the high-pressure (HP) compressor stages 1 to 6 rotor disc assembly before exceeding certain thresholds. Since we issued AD 2012-26-14, RRD developed a new silver-free nut that, if installed with a new HP compressor stages 1 to 6 disc assembly, would correct the unsafe condition identified in AD 2012-26-14. Therefore, we propose to supersede AD 2012-26-14 to restrict the applicability to engines exposed to silver plated nuts. Additionally, we are removing the terminating action statement from AD 2012-26-14 based on a comment received. This proposed AD would require removal from service of certain HP compressor stages 1 to 6 rotor disc assemblies before exceeding certain thresholds. We are proposing this AD to prevent failure of the HP compressor stages 1 to 6 rotor disc assembly, which could lead to an uncontained engine failure and damage to the airplane.

## Notices in this docket

- Nov 19, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-27633, comments due Jan 21, 2014 (https://www.federalregister.gov/documents/2013/11/19/2013-27633/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-formerly-rolls-royce-deutschland-gmbh)

---
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.