A typical ADS cannon is made of two barrels that can be fired separately. These cannons are usually put on Planet Cracker class ships in a large fixed array called an Asteroid Defense System, or ADS. The primary goal of this system is to automatically track and destroy debris, preventing damaging collisions with the ship. The ADS can be disabled, but not if one or more of the cannons is malfunctioning. However, if it is disabled, the cannons can be manually controlled. When this occurs, the hull integrity is displayed for the person controlling the cannon. Also, the controller must be cautious when firing the cannon because, unlike the ADS, they can potentially overheat the barrels preventing the cannon from functioning until cooled down.