# Airworthiness Directives; Airbus Airplanes
> **Rule** · Final rule; request for comments. · Published 2012-02-13 · Effective 2012-02-28 · 77 FR 7523
## Document
- **Document number:** 2012-3116
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 77 FR 7523
- **Publication date:** 2012-02-13
- **Effective date:** 2012-02-28
- **FAA docket:** Docket No. FAA-2012-0112
## Abstract

We are adopting a new airworthiness directive (AD) for all Airbus Model A340-600 series airplanes. This AD requires modifying the fire extinguishing system from a three-bottles solution with 4 flow metering compact unit into a two-bottles solution with 2 flow metering systems equipped with upgraded water absorbing filter elements. This AD was prompted by reports of partial blockage of a certain water absorbing filter element. We are issuing this AD to prevent partial blockage of a certain water absorbing filter element, which could lead to reduction of the halon outflow, which leads to incapacity to maintain fire extinguishing agent concentration. Combined with fire, this condition could result in an uncontrolled fire in the affected compartment.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/02/13/2012-3116/airworthiness-directives-airbus-airplanes)
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