# Airworthiness Directives; Rolls-Royce plc Turbofan Engines
> **Rule** · Final rule. · Published 2012-03-07 · Effective 2012-04-11 · 77 FR 13485
## Document
- **Document number:** 2012-5371
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce plc Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 77 FR 13485
- **Publication date:** 2012-03-07
- **Effective date:** 2012-04-11
- **FAA docket:** Docket No. FAA-2011-0959
## Abstract

We are adopting a new airworthiness directive (AD) for RB211- Trent 800 series turbofan engines. This AD requires inspecting the front combustion liner head section for cracking, and if found cracked, removing the front combustion liner head section from service at the next shop visit. This AD was prompted by mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. Specifically, routine inspections revealed cracking on the head sections of two RB211-Trent 800 front combustion liners. We are issuing this AD to prevent uncontained engine failure and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/03/07/2012-5371/airworthiness-directives-rolls-royce-plc-turbofan-engines)
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