Method for assembling a fuselage portion of an aircraft, and notably a nose of the aircraft

A method for assembling a fuselage portion of an aircraft, comprising at least a sequence of steps of:

• a succession of assembly steps comprising assembling a plurality of fuselage components of the fuselage portion of the aircraft to form a fuselage body;
• a mounting step comprising introducing, into the fuselage body thus formed, a floor module having at least a predetermined width;
• and
• a fastening step comprising fastening the floor module to the fuselage body;
• wherein the fuselage body is a deformed state prior to the fastening of the floor module to the fuselage body;
• wherein the fastening of the floor module to the fuselage body deforms the fuselage body from the deformed state into a final shape of the fuselage body and the assembled fuselage portion is obtained;
• and
• wherein deformation of the fuselage body from the deformed state into the final shape is obtained through introduction of the floor module into the fuselage body during the mounting step and through fastening of the floor module to the fuselage body without any other shaping action.