Abstract: An aircraft having a systems cabinet positioned in an avionics bay to the rear of a landing gear compartment and connected to the fuselage by at least one lower connecting system. The systems cabinet and/or the lower connecting system comprises at least one longitudinal beam, which has a front end connected by a front connection to a wall separating the avionics bay and the landing gear compartment, the front connection comprising a sliding connection sliding in a direction substantially parallel to the longitudinal axis.

Abstract: A connecting device including first and second off-center rings, the second ring being positioned in the first ring. The peripheral outer surface of the first ring is frustoconical and has a smaller cross section oriented in a first direction, and the inner surface of the first ring and the outer surface of the second ring, which surfaces interact with one another, have cross sections which increase between a first cross section and a second cross section that is offset in relation to the first cross section in an opposite direction to the first direction. This arrangement makes it possible to be able to prevent the rotation of the first and second rings once their angular positioning has been adjusted.

Abstract: An assembly method includes a succession of assembly steps of assembling fuselage components of the fuselage portion of the aircraft, for example the nose of the aircraft, to form a fuselage body, a mounting step of introducing, into the fuselage body thus formed, a floor module having at least a predetermined width, and which can be provided with items of equipment, and a fastening step of fastening the fuselage body to the floor module such that the floor module shapes the final shape of the fuselage body and the assembled fuselage portion is obtained, the floor module, which has at least a suitable predetermined width, making it possible, when it is incorporated into the fuselage body, to provide the fuselage body, which is slightly flexible, with its desired and definitive shape corresponding to the desired and definitive shape of the assembled fuselage portion.