# Airworthiness Directives; General Electric Company Turbofan Engines
> **Rule** · Final rule. · Published 2015-11-12 · Effective 2015-12-17 · 80 FR 69838
## Document
- **Document number:** 2015-28747
- **Category:** airworthiness
- **Manufacturer:** General Electric Company Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 80 FR 69838
- **Publication date:** 2015-11-12
- **Effective date:** 2015-12-17
- **FAA docket:** Docket No. FAA-2015-1658
## Abstract

We are adopting a new airworthiness directive (AD) for all General Electric Company (GE) GEnx-1B turbofan engine models. This AD was prompted by reports of GEnx-1B engine oil loss. This AD requires removal and replacement of the non-conforming ball valve in the oil filler cap. We are issuing this AD to prevent loss of engine oil, which could lead to failure of one or more engines, loss of thrust control, and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2015/11/12/2015-28747/airworthiness-directives-general-electric-company-turbofan-engines)
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