Summary
This document revises an earlier proposed airworthiness directive (AD), applicable to certain Saab Model SAAB 340B and SAAB 2000 series airplanes, that would have superseded an existing AD. That AD currently requires various inspections of fluorescent lamps and lampholders in the cabin area for discrepancies; corrections, if necessary; and reinspection of the lamps to ensure correct installation after replacement or reinstallation of the lamps or lampholders. The proposed AD would have added a requirement for replacement of the electronic light ballasts with improved ballasts, which would terminate the reinspections, and would have expanded the applicability of the existing AD. That proposal was prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. This new action revises the proposed rule to require a certain modification in accordance with revised procedures. The actions specified by this new proposed AD are intended to prevent electrical arcing between the fluorescent tube pins and the lampholders, which could burn the surrounding area and lead to smoke and fumes in the passenger compartment or lavatory area.