This avionic calculator, intended to be loaded on board an aircraft, the avionic calculator includes a protective casing and at least one module from among an information processing module able to execute at least one software application, an input/output management module and an electric power supply management module, each module being positioned inside the casing. The avionic calculator further includes a routing module positioned inside the casing, the routing module including several communication ports and being configured for transmitting at least one message from an input communication port to an output communication port.