# Airworthiness Directives; Rolls-Royce plc Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2012-12-26 · Effective 2013-01-10 · 77 FR 75831
## Document
- **Document number:** 2012-30650
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce plc Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 77 FR 75831
- **Publication date:** 2012-12-26
- **Effective date:** 2013-01-10
- **FAA docket:** Docket No. FAA-2012-1198
## Abstract

We are adopting a new airworthiness directive (AD) for certain serial numbers (S/Ns) of Rolls-Royce plc (RR) RB211-Trent 768-60, 772- 60, and 772B-60 turbofan engines. This AD requires initial and repetitive on-wing or in-shop inspections of the high pressure/ intermediate pressure (HP/IP) turbine bearing support oil feed tube outer heat shield. This AD also requires installation of a revised HP/ IP turbine bearing support structure as terminating action to the repetitive inspections of the HP/IP turbine bearing support oil feed tube outer heat shield. This AD was prompted by a report of high oil consumption due to an oil leak from the HP/IP turbine bearing support oil feed tube. We are issuing this AD to prevent failure of the HP turbine disc, uncontained engine failure, and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/12/26/2012-30650/airworthiness-directives-rolls-royce-plc-turbofan-engines)
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