Summary
This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain BAe Systems (Operations) Limited Model BAe 146 and Avro 146-RJ series airplanes, that currently requires identifying the part numbers of discharge valves and cabin pressure controllers, and related investigative and corrective actions if necessary. This action would require identifying the part number of an additional cabin pressure controller, and related investigative and corrective actions if necessary. The actions specified by the proposed AD are intended to prevent the installation of incorrect pressurization discharge valves and cabin pressure controllers, which could subject the airframe to excess stress and adversely affect the airframe fatigue life. This action is intended to address the identified unsafe condition.