The Stinar model PS-813PAR is a towable passenger stairway featuring a hydraulically adjustable height system. Stability is ensured by two spindle lift stabilizers mounted on both sides of the frame. Power for the lighting of the stairs, platform, and hydraulic unit is supplied by two 6-volt batteries connected in series, with a 120-VAC battery charger included. The stairway is compatible with aircraft such as the A-319, A-320, B-707, and many others, offering a threshold height range from 2.1 meters to 3.73 meters. The steel tube chassis frame ensures stability, while the stair assemblies are made of aluminum tread plate, providing a non-slip surface. Safety features such as stainless steel handrails and corner stabilization devices ensure secure boarding and deboarding. The stairway is protected against corrosion with an epoxy primer and a polyurethane topcoat.