jamesmason wrote:
pg.19, under Secondary Weapons - "in addition to being inside the attacker's firing arc, the closest point of the target ship's base must fall within the weapon range shown on the card"
I've checked the rulebook again and it is confirmed that for Proton Torpedoes, Concussion Missiles, and Cluster Missiles, these secondary weapons can only be activated if the enemy ships fall under the firing arc of the active ship.
Nevertheless, the only current exception is Ion Cannon Turret where it can fire beyond the firing arc.