# Airworthiness Directives; General Electric Company Engines
> **Rule** · Final rule. · Published 2025-04-16 · Effective 2025-05-21 · 90 FR 15926
## Document
- **Document number:** 2025-06420
- **Category:** airworthiness
- **Manufacturer:** General Electric Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 90 FR 15926
- **Publication date:** 2025-04-16
- **Effective date:** 2025-05-21
- **FAA docket:** Docket No. FAA-2024-2417
## Abstract

The FAA is superseding Airworthiness Directive (AD) 2020-20-17 and AD 2021-15-05 for all General Electric Company (GE) Model GE90- 110B1 and GE90-115B engines. AD 2020-20-17 prohibits dispatch of an airplane if certain status messages are displayed on the engine indicating and crew alerting system (EICAS) and if certain conditions are present; and as terminating action, requires revision of the existing FAA-approved minimum equipment list (MEL) by incorporating the dispatch restrictions into the MEL. AD 2021-15-05 requires initial and repetitive replacement of the full authority digital engine control (FADEC) integrated circuit (MN4) microprocessor. Since the FAA issued AD 2020-20-17 and AD 2021-15-05, the manufacturer has developed a software revision for the electronic engine control (EEC) FADEC that further mitigates the unsafe condition. This AD retains all the actions of AD 2020-20-17 and AD 2021-15-05, and also requires upgrading the EEC FADEC software to an EEC FADEC software version eligible for installation as a terminating action. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/04/16/2025-06420/airworthiness-directives-general-electric-company-engines)
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