The self-propelled passenger stairs mounted on special chassis model SGV180-400D is designed for boarding and unloading of passengers, crew and technical personal access to the AC and to serve various types of aircraft with door sill heights from 1800 to 4000 mm. The self-propelled passenger stairs is equipped with a Perkins model 404D22 diesel engine. The engine has good traction characteristics and is ideally suited for reliable operation of all ramp systems, engine capacity is 2.2 lit., rated power is 49 hp. To control all the functions of the stairs, LOGO! Siemens logic block is installed. The front platform of the ramp is equipped with an ultrasonic proximity sensor and a limit switch allowing safe docking of the ramp with the aircraft. Optional possibility of installation of canopy or fully closed gallery on the upper platform and the ladder is possible. The color upon customer’s request (RAL by request). Optional possibility of the stairs design with electric engine. Possibility of other options installation which are to be discussed to the customer per each order separately.