# Airworthiness Directives; Rolls-Royce plc Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2013-01-30 · Effective 2013-02-14 · 78 FR 6206
## Document
- **Document number:** 2013-01361
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce plc Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 78 FR 6206
- **Publication date:** 2013-01-30
- **Effective date:** 2013-02-14
- **FAA docket:** Docket No. FAA-2013-0030
## Abstract

We are adopting a new airworthiness directive (AD) for all Rolls-Royce plc 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 on-wing inspections of low-pressure turbine (LPT) disk seal fins and interstage seals when post-flight review indicates Engine Health Monitoring (EHM) vibratory maintenance-alert limits were exceeded in flight. The AD also requires in-shop inspections of the LPT disk seal fins and interstage seals to detect cracks or damage and, depending on the findings, accomplishment of corrective action. This AD is prompted by a Trent 900 engine experiencing LPT stage 2 disk interstage seal material loss and increased low-pressure rotor vibration while in flight. We are issuing this AD to prevent cracks in the LPT disk, which could result in uncontained engine failure and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/01/30/2013-01361/airworthiness-directives-rolls-royce-plc-turbofan-engines)
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