Patent ID: 7584823

Claim:
A ladder positioned between a first hatch made in a floor of an upper level of an aircraft and a second hatch made in a floor of a lower level of said aircraft, the first hatch and the second hatch being at least partially face-to-face with each other, a bottom end of the ladder being mounted in rotation on the floor of the lower level and a top end of the ladder being unattached and capable of alternately abutting a first side and a second side opposite the first hatch so that the ladder has a first stable position and a second stable position, wherein the top end of the ladder is provided with a safety device, the safety device being fixedly formed firstly to one side of the first hatch and secondly to the top end of the ladder in such a way that the safety device is activated when the ladder is in its second stable position and blocks an opening of the first hatch so as to avoid a fall from the upper level to the lower level, the safety device having a first edge fixed to the first side of the first hatch and a second edge of the net being fixed to the top end of the ladder.