Mobile step tower with a platform of SPA type is designed for maintenance and refuelling of aircraft. It has a drawbar for transport with the help of an aerodrome tractor. The weight of the ladder also allows moving it manually. It is equipped with a soft edge to avoid damage to the vehicle.
Reflective elements can be added, parts of the structure can be painted in orange colour. The aerial platform ladder is a collapsible structure consisting of four support legs, struts and frames for stiffness, a stairway and a platform with edges and guardrails on three sides. The ladder supports have sturdy crossbeams. The ladder is equipped with 4 wheels with screw jacks for moving and fixing in a certain position.
The two front wheels are steered by a steering trapeze from the drawbar. The drawbar is fixed in vertical position.
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