Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Raytheon Model BAe 125-1000A and Model Hawker 1000 series airplanes. This proposal would require various modifications to increase the size of certain existing pressure venting areas and to add additional venting areas. This proposal is prompted by results of a design review of the requirements for certification of the cabin pressurization system. The actions specified by the proposed 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.