# Airworthiness Directives; Rolls-Royce plc Turbojet Engines
> **Rule** · Final rule. · Published 2018-08-21 · Effective 2018-09-25 · 83 FR 42207
## Document
- **Document number:** 2018-18021
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce plc Turbojet
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 83 FR 42207
- **Publication date:** 2018-08-21
- **Effective date:** 2018-09-25
- **FAA docket:** Docket No. FAA-2017-1108
## Abstract

We are superseding Airworthiness Directive (AD) 2016-03-03 for all Rolls-Royce plc (RR) Viper Mk. 521, Viper Mk. 522, and Viper Mk. 601-22 turbojet engines. AD 2016-03-03 required reducing the life of certain critical parts. This AD requires reducing the life of certain critical parts and adds additional engine parts to the applicability. This AD was prompted by a determination made by RR that additional parts for the applicable RR Viper turbojet engine models are affected. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/08/21/2018-18021/airworthiness-directives-rolls-royce-plc-turbojet-engines)
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