With a cabin entrance door that can be converted into a “stairstep,” the new U. S. Army Bell “Airacuda”, multi-place twin-engine fighting plane, does away with the need for extra stepladder equipment for entering and leaving the cabin. The door, opened by sliding it downward on tracks, fits flush with the fuselage when closed. Built into the door are three “trap-door” leaves hinged at the top, which are folded back by pressing a lever to form the steps.