Raisable undercarriage, in particular for a heavy transport aircraft

An aircraft raisable undercarriage comprising a hinged leg and bracing means associated with the hinged leg, the hinged leg being composed of a shock-absorbing main strut having a hinge about which it is hinged to the structure of an aircraft, said hinge defining a hinge axis which is perpendicular to the longitudinal midplane of the aircraft, and of a shock-absorbing rod at the end of which a longitudinal beam is hinged that is equipped with a plurality of pairs of wheels, wherein:

• the undercarriage is of the leg-shortening type, having a shock absorber composed mainly of a sliding rod and a plunging rod, and also of a hinged system connecting the plunging rod to the shock-absorbing main strut, the hinged system being controlled by a link fixed to the aircraft structure so as to pull the shock absorber up when the leg is being raised, and so as to push the shock absorber down when the leg is being lowered;
• and
• the bracing means are organized in the form of a foldable brace which is disposed in front of the leg so that the undercarriage is raised longitudinally and forwards, said brace having a top arm hinged to the aircraft structure and a bottom arm hinged to the bottom end of the sliding rod, and said brace further being organized so that, in the undercarriage down position and with the shock absorber extended, the lowered leg slopes towards the front of the aircraft, and the direction of the alignment formed by the brace is substantially orthogonal to the axis of the leg.