# Proposed AD FAA-2012-1167: Rolls-Royce Deutschland Ltd & Co KG Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-06-01
- Products: Rolls-Royce Deutschland
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 13, 2012, 77 FR 74123
- Comments due: February 11, 2013
- Became: [AD 2013-06-01](https://openairdocs.org/ad/2013-06-01)
- Docket: FAA-2012-1167 (https://www.regulations.gov/docket/FAA-2012-1167, where comments are filed)
- Project: 2012-NE-36-AD
- FR document: 2012-30065
- Official PDF: https://openairdocs.org/files/sha256/a7/93/a7936d6697ec2ad9d1473c0dc43015ceaa2acbbfa9bd69e39088c346dd0c2407 (from https://www.govinfo.gov/content/pkg/FR-2012-12-13/pdf/2012-30065.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/12/13/2012-30065/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3B321656CD659D9486257AD3004C79E0.0001
- Page: https://openairdocs.org/proposed/FAA-2012-1167

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Rolls-Royce Deutschland Ltd & Co KG (RRD) models Tay 620-15 and Tay 650-15 turbofan engines. This proposed AD was prompted by RRD recalculating the Declared Safe Cyclic Life (DSCL) for certain low- pressure compressor (LPC) rotor disc assemblies operating to the Plan D Flight Mission. This proposed AD would require removing the affected LPC rotor disc assemblies at a new lower recalculated DSCL. We are proposing this AD to prevent failure of the LPC rotor disc assembly, uncontained engine failure, and damage to the airplane.

## Notices in this docket

- Dec 13, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-30065, comments due Feb 11, 2013 (https://www.federalregister.gov/documents/2012/12/13/2012-30065/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-turbofan-engines)

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