# Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Turbofan Engines
> **Rule** · Final rule. · Published 2013-03-20 · Effective 2013-04-24 · 78 FR 17079
## Document
- **Document number:** 2013-06115
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce Deutschland Ltd & Co KG Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 78 FR 17079
- **Publication date:** 2013-03-20
- **Effective date:** 2013-04-24
- **FAA docket:** Docket No. FAA-2012-1167
## Abstract

We are adopting 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 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 AD requires removing the affected LPC rotor disc assemblies at a new lower recalculated DSCL. We are issuing this AD to prevent failure of the LPC rotor disc assembly, uncontained engine failure, and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/03/20/2013-06115/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-turbofan-engines)
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