# Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2017-05-26 · Effective 2017-06-12 · 82 FR 24236
## Document
- **Document number:** 2017-10437
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce Deutschland Ltd & Co KG Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 82 FR 24236
- **Publication date:** 2017-05-26
- **Effective date:** 2017-06-12
- **FAA docket:** Docket No. FAA-2017-0186
## Abstract

We are adopting a new airworthiness directive (AD) for all Rolls-Royce Deutschland Ltd & Co KG (RRD) model Spey 506-14A, Spey 555- 15, Spey 555-15H, Spey 555-15N, and Spey 555-15P turbofan engines. This AD requires reducing the maximum approved life limits 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/2017/05/26/2017-10437/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-turbofan-engines)
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