Airworthiness Directives; BAe Systems (Operations) Limited Model BAe 146 and Model Avro 146-RJ Series Airplanes

This amendment supersedes an existing airworthiness directive (AD), applicable to all BAe Systems (Operations) Limited Model BAe 146 and Model Avro 146-RJ series airplanes, 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. For certain airplanes, this amendment requires repetitive inspections for "drill marks" or corrosion on the underside of the wing top skin, and corrective actions, if necessary, until all corrective actions and protective treatment actions are done. For certain airplanes, this amendment adds a requirement for one-time detailed 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 amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this 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.