# Airworthiness Directives; General Electric (GE) CF6-80E1 Series Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2005-05-19 · Effective 2005-06-03 · 70 FR 28806
## Document
- **Document number:** 05-9887
- **Category:** airworthiness
- **Manufacturer:** General Electric (GE) CF6-80E1 Series Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 70 FR 28806
- **Publication date:** 2005-05-19
- **Effective date:** 2005-06-03
- **FAA docket:** Docket No. FAA-2005-21238
## Abstract

The FAA is adopting a new airworthiness directive (AD) for General Electric (GE) CF6-80E1 series turbofan engines that have an electronic control unit (ECU) with software version E.1.M. or earlier installed. This AD requires installing improved software for the ECU. This AD results from an uncommanded engine acceleration event caused by a failure of the ECU digital interface unit (DIU). We are issuing this AD to prevent an undetected failure of the ECU DIU, which could result in uncommanded acceleration to the overspeed limit without response to throttle commands. The airplane could then experience asymmetric thrust.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/05/19/05-9887/airworthiness-directives-general-electric-ge-cf6-80e1-series-turbofan-engines)
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