Control unit for an aircraft capable of hovering or for a flight simulation system of said aircraft , said control unit being programmed to: - receive at input at least one datum associated with equipment and/or kits actually or simulatedly installed on said aircraft and/or with the operating configuration of said equipment and/or kits ; the installation and/or the configuration of said equipment and/or kits causing, in use, a reduction in the maximum actual or simulated forward velocity of said aircraft ; - store a table (TX) defining a correspondence between each said data and a respective value of a first signal (Vmax, Vmax') associated with a value of maximum actual or simulated forward velocity of said aircraft ; - display the lowest of said first signals (Vmax, Vmax'); said control unit comprising: - a processing stage programmed to acquire at input said plurality of data; - a first storage stage wherein said table (TX) is stored and operationally connected to said processing stage ; and - a display stage (50, 51; 50', 51') programmed to command the display of said first signal (Vmax, Vmax') and commanded by said second storage stage ; characterized in that it comprises a second storage stage programmed to store a file containing said equipment and/or kits which are nominally installable in an actual or simulated manner on said aircraft ; and in that it comprises an interface that is used to declare that some of said equipment and/or kits are absent; said second storage stage being operatively connected with said interface . - receive at input at least one datum associated with equipment and/or kits actually or simulatedly installed on said aircraft and/or with the operating configuration of said equipment and/or kits ; the installation and/or the configuration of said equipment and/or kits causing, in use, a reduction in the maximum actual or simulated forward velocity of said aircraft ; - store a table (TX) defining a correspondence between each said data and a respective value of a first signal (Vmax, Vmax') associated with a value of maximum actual or simulated forward velocity of said aircraft ; - display the lowest of said first signals (Vmax, Vmax'); said control unit comprising: - a processing stage programmed to acquire at input said plurality of data; - a first storage stage wherein said table (TX) is stored and operationally connected to said processing stage ; and - a display stage (50, 51; 50', 51') programmed to command the display of said first signal (Vmax, Vmax') and commanded by said second storage stage ; - a processing stage programmed to acquire at input said plurality of data; - a first storage stage wherein said table (TX) is stored and operationally connected to said processing stage ; and - a display stage (50, 51; 50', 51') programmed to command the display of said first signal (Vmax, Vmax') and commanded by said second storage stage ; characterized in that it comprises a second storage stage programmed to store a file containing said equipment and/or kits which are nominally installable in an actual or simulated manner on said aircraft ; and in that it comprises an interface that is used to declare that some of said equipment and/or kits are absent; said second storage stage being operatively connected with said interface . <EOS>