Aircraft air-conditioning system with a reduced risk of icing

An aircraft air-conditioning system, comprising:

• an air-conditioning unit that is connected by a main fresh-air line to a mixer in order to supply the mixer with fresh air at a desired low temperature, and
• a fresh-air branch line that is connected upstream of the mixer to the main fresh-air line, wherein the fresh-air branch line has a flow cross section that is smaller than a flow cross section of the main fresh-air line, and
• a heating device, which is adapted to heat at least one of the main fresh-air line and the fresh-air branch line in a region of connection of the main fresh-air line to the fresh-air branch line, wherein the heating device comprises a line, through which a heat transfer fluid flows, and that the fresh-air branch line in the region of connection of the main fresh-air line to the fresh-air branch line extends through the line, through which the heat transfer fluid flows,
• wherein the main fresh-air line and the fresh-air branch line in the region of connection of the main fresh-air line to the fresh-air branch line are so formed that a main fresh air flow flowing through the main fresh-air line is deflected, while a fresh air branch flow flowing through the fresh-air branch line experiences substantially no deflection, and
• wherein the line, through which the heat transfer fluid flows, opens out into the main fresh-air line in the region of connection of the main fresh-air line to the fresh-air branch line.