# Airworthiness Directives; Rolls-Royce plc Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2019-03-12 · Effective 2019-03-27 · 84 FR 8799
## Document
- **Document number:** 2019-04394
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce plc Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 84 FR 8799
- **Publication date:** 2019-03-12
- **Effective date:** 2019-03-27
- **FAA docket:** Docket No. FAA-2019-0056
## Abstract

We are superseding airworthiness directive (AD) 2017-22-13 for certain Rolls-Royce plc (RR) RB211-Trent 900 turbofan engine models. AD 2017-22-13 required an inspection of the drains mast and the replacement or repair of the drains mast if a crack is found. This AD retains this requirement, but adds repetitive inspections and expands the population of affected RR RB211-Trent 900 turbofan engine models. This AD was prompted by RR in-service findings that indicated a need to include part number (P/N) FW29847 drains mast and additional RR RB211- Trent 900 turbofan engines to the affected population. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/03/12/2019-04394/airworthiness-directives-rolls-royce-plc-turbofan-engines)
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