# Airworthiness Directives; Rolls-Royce plc RB211-524 Series Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2003-10-24 · Effective 2003-11-10 · 68 FR 60843
## Document
- **Document number:** 03-26470
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce plc RB211-524 Series Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 68 FR 60843
- **Publication date:** 2003-10-24
- **Effective date:** 2003-11-10
- **FAA docket:** Docket No. 2003-NE-36-AD
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Rolls-Royce plc (RR) RB211-524 series turbofan engines. This AD requires replacing the dedicated generator rotor assembly, the adaptor casing on the high speed gearbox (HSGB), and bearings with new design parts on certain engines. This AD is prompted by several reports of dedicated generator rotor assembly bearing failures. We are issuing this AD to prevent possible uncommanded engine acceleration with no reaction to throttle movement, which could result in uncontrollable asymmetric engine thrust levels during takeoff or climb.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/10/24/03-26470/airworthiness-directives-rolls-royce-plc-rb211-524-series-turbofan-engines)
---
*AI Analytics · CC0 1.0*