# Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes
> **Rule** · Final rule. · Published 1997-04-10 · Effective 1997-05-15 · 62 FR 17536
## Document
- **Document number:** 97-9011
- **Category:** airworthiness
- **Manufacturer:** Airbus Model A310 and A300-600 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 62 FR 17536
- **Publication date:** 1997-04-10
- **Effective date:** 1997-05-15
- **FAA docket:** Docket No. 94-NM-196-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Airbus Model A310 and A300-600 series airplanes, that requires a functional flow test and leak test to verify if the pressure reducing valve in the cargo fire extinguishing system is in a serviceable condition, and replacement of any faulty valve with a new valve prior to extended range twin-engine operations of the airplane. This amendment is prompted by a report that, during a scheduled maintenance check, an inoperative pressure reducing valve was found in the cargo fire extinguishing system. The actions specified by this AD are intended to ensure that a faulty pressure reducing valve is not installed, which could result in reduced fire protection of the cargo compartment of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1997/04/10/97-9011/airworthiness-directives-airbus-model-a310-and-a300-600-series-airplanes)
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