Airworthiness Directives; Raytheon Model BAe.125 Series 800A (C-29A and U-125 Military), 1000A, and 1000B Airplanes; Hawker 800 (U-125A Military) Airplanes; and Hawker 800XP and 1000 Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain Raytheon Model BAe.125 series 800A (C-29A and U- 125 military), 1000A, and 1000B airplanes; Hawker 800 (U-125A military) airplanes; and Hawker 800XP and 1000 series airplanes, that requires removal of existing clamps, bedding tapes, and rubber connecting sleeves at the ends of the turbine air discharge duct and the water separator, and replacement of the clamps and rubber connecting sleeves with new, improved components. This AD also requires, for certain airplanes, removal of aluminum bedding strips that are installed under the existing clamps. The actions specified by this AD are intended to prevent the turbine air discharge duct or water separator outlet duct from disconnecting from the cold air unit turbine or from the water separator, resulting in the loss of air supply to maintain adequate cabin pressure. Loss of adequate cabin pressure at high altitude would require emergency procedures, such as use of oxygen, auxiliary pressurization, or emergency descent.