Abstract: The application discloses an aeronautical input/output device (70) for flight task management which comprises a display unit (90) with a housing (97), and a keyboard unit (91) which is adapted to communicate with the display unit (90). The housing (97) comprises a keyboard stowage area (87) for receiving the keyboard unit (91) into the keyboard stowage area (87), and the keyboard unit (91) is detachable from or attachable to the display unit (90). Furthermore, the input/output device (70) comprises a biometric identification means with a biometric sensor (83) and an interface to a database, the database comprising an authorized users list (24). Therein, the biometric sensor (83) is provided on a casing of the aeronautical input/output device. A locking device (85, 98, 99, 101, 103) is provided for detachably fastening the keyboard unit (91) to the display unit (90) and is configured to unlock in response to a predetermined signal of the biometric identification means.