This avionics device intended to be on board an aircraft is configured to implement an avionics function and to control the display, by at least one receiving device, of data associated with the avionics function, the avionics function including one or several avionics commands able to be displayed on the receiving device and selected by a user.The avionics device comprises a module for generating a data message, and a module for sending said message to the receiving device.The generating module is configured to generate a usage domain message containing a list of avionics command(s) available for the corresponding avionics function, and the sending module is configured to send the usage domain message to the receiving device, to display the availability of the only command(s) included in said list.