# Airworthiness Directives; Rolls-Royce plc Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2014-03-21 · Effective 2014-04-07 · 79 FR 15665
## Document
- **Document number:** 2014-04952
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce plc Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 79 FR 15665
- **Publication date:** 2014-03-21
- **Effective date:** 2014-04-07
- **FAA docket:** Docket No. FAA-2013-1015
## Abstract

We are adopting a new airworthiness directive (AD) for all Rolls-Royce plc (RR) RB211-Trent 970-84, RB211-Trent 970B-84, RB211- Trent 972-84, RB211-Trent 972B-84, RB211-Trent 977-84, RB211-Trent 977B-84, and RB211-Trent 980-84 turbofan engines. This AD requires inspections of the low-pressure turbine exhaust case and support assembly or tail bearing housing (TBH) to detect cracks or damage. This AD was prompted by an RR structural re-analysis indicating that the TBH may not retain full limit load capability in all fail-safe conditions. We are issuing this AD to prevent failure of the TBH, resulting in damage to the engine and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2014/03/21/2014-04952/airworthiness-directives-rolls-royce-plc-turbofan-engines)
---
*AI Analytics · CC0 1.0*