An aircraft system carrier element includes a basic body made of a sound- and heat-insulating material, in which are formed an air conditioning duct, which is connectable to an aircraft air conditioning system and provided for supplying an aircraft compartment, and a line duct for receiving lines that are provided for supplying the aircraft compartment. The basic body includes a rear wall and a line duct cover that is fastened detachably to the rear wall. The detachable fastening of the line duct cover enables easy access to the lines for maintenance purposes, when necessary, while also protecting the lines against environmental effects in normal operation.