System and method for cooling a thermally loaded device on board an aircraft

System (10) for cooling a thermally loaded device on board an aircraft, comprising

• a distribution line (12) which is in communication with an installation space (14) of the thermally loaded device,
• a coolant supply line (20) which is in communication with a coolant source,
• a heat removal line (28) which is in communication with a source of pressure below atmospheric pressure, and
• a shut-off control device (34) which is adapted so as, in a first position, to separate the distribution line (12) from the coolant supply line (20) and connect the distribution line (12) to the heat removal line (28) and, in a second position, to connect the distribution line (12) to the coolant supply line (20) and separate the distribution line (12) from the heat removal line (28), characterized in that the coolant supply line (20) is connected to a region of a ram-air channel (22) to which a pressure above atmospheric pressure is applied, and in that the heat removal line (28) is connected to a region of the ram-air channel (22) to which a pressure below atmospheric pressure is applied.