The ZT58SKT Automotive Passenger Stair is a heightened auto passenger stair, installed with the special chassis.It can be used for airplanes with doorsill height between 2300mm and 5800mm.The ZT58CKT Automotive Passenger Stairs can be used for airplanes with doorsill height between 2400mm and 5800mm.The stair is a telescopic stairway type and its height may be adjusted step-by-step allowing the passengers to embark and disembark in total comfort.