Summary
This document revises an earlier proposed airworthiness directive (AD), applicable to all BAe Systems (Operations) Limited Model BAe 146 and Model Avro 146-RJ series airplanes, that would have superseded an existing AD that currently requires a one-time inspection for "drill marks" and corrosion on the underside of the wing top skin, and corrective actions, if necessary. The proposed AD would have required a one-time inspection for "drill marks" and corrosion, and corrective actions, if necessary, per new procedures. For certain airplanes, the proposed AD would have added a requirement for one-time detailed visual and borescopic inspections of the fuel tank, pump, and stringers for paint debris and inadequacy of the existing protective treatment coating; and corrective actions, if necessary. This new action revises the proposed rule by requiring repetitive inspections for "drill marks" and corrosion on the underside of the wing top skin, and corrective actions, if necessary, until all corrective actions and protective treatment actions are done. The actions specified by this new proposed AD are intended to prevent corrosion from developing on the underside of the top skin of the center wing, which could result in reduced structural integrity of the airplane.