# Airworthiness Directives; Airbus Model A300 B4-600R Series Airplanes, A300 C4-605R Variant F Airplanes, A300 F4-600R Series Airplanes; and Model A310-300 Series Airplanes
> **Rule** · Final rule. · Published 2006-06-12 · Effective 2006-07-17 · 71 FR 33600
## Document
- **Document number:** 06-5124
- **Category:** airworthiness
- **Manufacturer:** Airbus Model A300 B4-600R Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 71 FR 33600
- **Publication date:** 2006-06-12
- **Effective date:** 2006-07-17
- **FAA docket:** Docket No. FAA-2006-24103
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Airbus transport category airplanes. This AD requires replacing the existing vent float valve with a new, improved vent float valve. This AD results from reports of failure of the vent float valve in the left-hand outboard section of the trimmable horizontal stabilizer. We are issuing this AD to prevent, in the event of a lightning strike to the horizontal stabilizer, sparking of metal parts and debris from detached and damaged float valves, or a buildup of static electricity, which could result in ignition of fuel vapors and consequent fire or explosion.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/06/12/06-5124/airworthiness-directives-airbus-model-a300-b4-600r-series-airplanes-a300-c4-605r-variant-f-airplanes)
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