HMAS Attack (P 90) was the lead vessel of the Attack-class patrol boats operated by the Royal Australian Navy (RAN). Launched on 8 April 1967 and commissioned on 17 November 1967, the ship exemplified a largely commercial design tailored for patrol and support roles in Australia's northern waters. With a length overall of 107.6 feet (32.8 meters), a beam of 20 feet (6.1 meters), and a draught of approximately 6.4 feet (2.0 meters) at standard load, the vessel was built for operational efficiency in remote regions. Constructed by Evans Deakin and Company in Brisbane, Queensland, Attack featured a displacement of approximately 100 tons at standard load and 146 tons at full load. Its propulsion system consisted of two 16-cylinder Paxman YJCM diesel engines delivering 3,460 shaft horsepower, enabling a top speed of 24 knots. The vessel had a range of 1,200 nautical miles at 13 knots, suitable for extended patrols. The crew comprised three officers and sixteen sailors, and armament included a bow-mounted Bofors 40 mm gun, supplemented by two .50-calibre M2 Browning machine guns and small arms. Designed with a focus on operational resilience, Attack incorporated many commercial components to facilitate maintenance in remote areas, reflecting its role in patrolling Australia's northern maritime zones. Its primary missions involved fisheries protection and supporting survey operations, notably assisting the survey ship Moresby. During her 17 years of service with the RAN, Attack operated mainly in northern Australian waters, contributing to maritime security and resource protection. She was decommissioned on 21 February 1985 and transferred to the Indonesian Navy on 24 May 1985, where she was renamed Sikuda. Her service exemplifies the practical, regional-oriented design of the Attack-class patrol boats and their importance in Australia's maritime defense strategy during the Cold War era.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.