Airworthiness Directives; Raytheon Model BAe 125-1000A and Model Hawker 1000 Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to all Raytheon Model BAe 125-1000A and Model Hawker 1000 series airplanes, that requires various modifications to increase the size of certain existing pressure venting areas and to add additional venting areas. This amendment is prompted by results of a design review of the requirements for certification of the cabin pressurization system. The actions specified by this AD are intended to prevent inadequate venting of cabin pressure in the event of rapid decompression, which could cause failure or deformation of certain structural members, and consequent reduced controllability of the airplane.