A cage for a control valve trim assembly includes a cage body having an opening at one end and a wall extending from the opening, a plurality of cage openings disposed in the wall, and a pressure relief mechanism disposed in the cage wall. The system also includes a control system configured to receive the vehicle position, heading, and at least one of roll and pitch, and configured to generate a steering command to a vehicle steering system. In the method the motion information of the transport appliance is determined with two channels, and if the determined motion informations deviate from each other by more than the set limit value, an emergency stop is executed. This circular flange has one or more trimmer line exit openings on the circumference.