Anti-submarine warfare
In their ship-borne, anti-submarine role, the HAS.3s could carry two Mark 44 torpedoes or Mark 46 torpedoes (with parachutes) or four Mk.11 Depth Charges in addition to their Plessey dipping Sonar. They could also be fitted with a door-mounted Machine gun and act as a self-contained unit, handling all operations of Anti-submarine warfare(ASW).