Process for anti-collision of presentation of information in a viewfinder head high for aircraft

The invention relates to a method of managing a collision avoidance system for an aircraft, said system comprising collision detecting means with a threat and at least one display device head-up. Symbology has two display modes dedicated to collision detection which are: on the one hand an "Action" mode: a potential collision is detected by the system, the symbology comprises at least one symbol representing the limits of the disengagement path of the aircraft to avoid a collision and enabling the pilot to engage his avoidance maneuver, and also a "Control" mode: this mode is displayed when the avoidance maneuver is engaged and avoided the collision, the symbology comprises at least the symbol representative of the limits of the aircraft disengagement path and a top view showing the air space around the aircraft and comprising at least one representation of the threat.