A locking device which includes a hook and a dual control for locking the hook. The dual control includes a first shaft and a second shaft. The first shaft incorporates a section and is rotationally mobile between a hooked position, in which the section is accommodated in a housing of the hook and an unhooked position, in which the section is outside the housing of the hook. The second shaft incorporates a section and is rotationally mobile between a locked position, in which the section of the second shaft is accommodated in a notch in a flange of the first shaft and an unlocked position, in which the section of the second shaft is outside the notch in the flange of the first shaft.