Self-propelled telescopic passenger stairs model TSP 4520D and TSP 5822D of Italian manufacturer with diesel engine 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 2000 mm to 4520 mm for TSP 4520D and 2200 mm to 5800 mm for TSP 5822D. The telescopic passenger stairs is mounted on special chassis of the manufacturer and has 4x2 wheel base. The extension of the ladder is made by hydraulic cylinder raising, which is located below the lower ladder. The inclination of the ladder is made by two tilt hydraulic cylinders. The stairs is equipped with a Perkins 404D22 diesel engine. Optional possibility of installation of canopy or fully closed gallery on the upper platform and the ladder is possible. Optional possibility of the stairs design with electric engine. The color upon customer’s request (RAL by request). Other additional options are possible and are to be discussed to the customer per each order separately.