# Airworthiness Directives; Rolls-Royce plc Model RB211 Turbofan Engines
> **Rule** · Final rule. · Published 2003-05-16 · Effective 2003-06-20 · 68 FR 26481
## Document
- **Document number:** 03-12109
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce plc Model RB211 Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 68 FR 26481
- **Publication date:** 2003-05-16
- **Effective date:** 2003-06-20
- **FAA docket:** Docket No. 2002-NE-12-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), that is applicable to Rolls-Royce plc (RR) model RB211-535E4-37, RB211- 535E4-B-37, and RB211-535E4-B-75 turbofan engines. This amendment requires removal from service of certain high pressure (HP) turbine discs before they reach newly established life limits. This amendment is prompted by the manufacturer's inspections and analysis of HP turbine discs that have accumulated high cycles. The actions specified by this AD are intended to prevent machining-induced cracking of the HP turbine disc which could cause an uncontained HP turbine disc failure and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/05/16/03-12109/airworthiness-directives-rolls-royce-plc-model-rb211-turbofan-engines)
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