# Airworthiness Directives; Boeing Model 777 Airplanes
> **Rule** · Final rule. · Published 2009-02-26 · Effective 2009-04-02 · 74 FR 8726
## Document
- **Document number:** E9-3367
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 777
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 74 FR 8726
- **Publication date:** 2009-02-26
- **Effective date:** 2009-04-02
- **FAA docket:** Docket No. FAA-2007-0254
## Abstract

We are adopting a new airworthiness directive (AD) for certain Boeing Model 777 airplanes. This AD requires installing software upgrades to the airplane information management system (AIMS) located in the flight compartment. This AD results from an investigation that revealed that detrimental effects could occur on certain AIMS software during flight. We are issuing this AD to prevent an unannunciated loss of cabin pressure. If an undetected loss of pressure event were to cause an unsafe pressure in the cabin, the flight crew could become incapacitated.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/02/26/E9-3367/airworthiness-directives-boeing-model-777-airplanes)
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