Airworthiness Directives; Raytheon Model DH.125-400A; BH.125-400A and -600A; HS.125-600A and -700A; BAe 125-800A Series Airplanes; and Hawker 800 and Hawker 800 XP Series Airplanes Including Military Variants

This amendment adopts a new airworthiness directive (AD), applicable to certain Raytheon Model DH.125-400A; BH.125-400A and - 600A; HS.125-600A and -700A; BAe 125-800A series airplanes; and Hawker 800 and Hawker 800 XP series airplanes (including military variants C29A, U125, U125A). This amendment requires a one-time inspection to determine if certain high pressure oxygen hose assemblies are installed, and, if installed, replacement of those hose assemblies with new, improved hose assemblies. This amendment is prompted by a report that certain high pressure oxygen hose assemblies are susceptible to leakage due to those hose assemblies not meeting design specifications during manufacturing. The actions specified by this AD are intended to prevent leaks in high pressure oxygen hose assemblies, which, if not detected and corrected, could result in insufficient oxygen available to the passengers or crew if the cabin pressure altitude should rise to a level requiring emergency oxygen.