# Airworthiness Directives; Rolls-Royce plc Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2013-11-26 · Effective 2013-12-11 · 78 FR 70487
## Document
- **Document number:** 2013-28221
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce plc Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 78 FR 70487
- **Publication date:** 2013-11-26
- **Effective date:** 2013-12-11
- **FAA docket:** Docket No. FAA-2013-0750
## Abstract

We are adopting a new airworthiness directive (AD) for Rolls- Royce plc (RR) RB211-535E4-37, -535E4-B-37, -535E4-C-37, RB211Trent 768-60, 772-60, and 772B-60 turbofan engines. This AD requires removal of certain high-pressure (HP) and intermediate-pressure (IP) turbine discs before their accumulated cyclic lives have reached the revised limits. This AD was prompted by a report of an HP disc contaminated with a steel inclusion. We are issuing this AD to prevent failure of the HP or IP turbine disc, uncontained engine failure, and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/11/26/2013-28221/airworthiness-directives-rolls-royce-plc-turbofan-engines)
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