Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Saab Model SAAB 2000 series airplanes. This proposal would require inspection of the two-way check valve on the engine fire extinguishing system for discrepancies, and corrective action, if necessary. This proposal is prompted by issuance of mandatory continued airworthiness information by a foreign civil airworthiness authority. The actions specified by the proposed AD are intended to prevent discrepancies of the check valve, which could result in improper functioning of the engine fire extinguishing system.