Abstract: The cargo door assembly (17) of the present invention is located in the aft end of an aircraft fuselage (11) and comprises a cargo ramp (19) and cargo door (21) with a hinged pressure bulkhead (23) together with operating linkage and locks coordinated for sequential operation whereby access to the pressurized aircraft interior (15) is possible for on and off loading of cargo while the aircraft is in flight or on the ground. The structural components of the door assembly (17) are entirely of the plug-type design and when closed, locking and sealing are effected in a manner to prevent premature and inadvertent depressurization of the interior.