# Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Turbofan Engines
> **Rule** · Final rule. · Published 2017-09-26 · Effective 2017-10-31 · 82 FR 44713
## Document
- **Document number:** 2017-20531
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce Deutschland Ltd & Co KG Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 82 FR 44713
- **Publication date:** 2017-09-26
- **Effective date:** 2017-10-31
- **FAA docket:** Docket No. FAA-2017-0140
## Abstract

We are adopting a new airworthiness directive (AD) for certain Rolls-Royce Deutschland Ltd & Co KG (RRD) model Tay 620-15 turbofan engines. This AD requires reducing the maximum approved life limit. This AD was prompted by RRD recalculating the life limit for certain high-pressure compressor (HPC) stage 12 rotor disks. We are issuing this AD to correct the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2017/09/26/2017-20531/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-turbofan-engines)
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