This self-propelled passengers stair provides access under the best possible conditions of safety and comfort for passengers of narrow, medium and wide body aircraft with a door sill height between 2.20 and 5.80 m. 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. The extruded-aluminium steps have a highly efficient non-slip surface, offering additional safety, anodised handrails and bright stairway lighting. All driving and aircraft approach operations are carried out from the cabin, which, thanks to its all-round glazing, provides perfect visibility of aircraft. These operations are carried out under the best conditions of safety and comfort.