Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Saab Model SAAB 340B and Model SAAB 2000 series airplanes. This proposal would require a one- time inspection to determine if certain switches are installed on the fire handle panel of the fire handle assembly; and replacement of the fire handle panel with a new fire handle panel, if necessary. This proposal is prompted by a report indicating that, during manufacture, a batch of defective switches were installed on certain fire handle panels on these airplanes. The actions specified by the proposed AD are intended to ensure the proper switches are installed in the fire handle assembly. A defective switch in the fire handle assembly could prematurely fail and, consequently, prevent the proper operation of the engine fire protection system in the event of a fire.