The Attack class was ordered in 1964 to operate in Australian waters as patrol boats (based on lessons learned through using the Ton class minesweepers on patrols of Borneo during the Indonesia-Malaysia Confrontation, and to replace a variety of old patrol, search-and-rescue, and general-purpose craft. Initially, nine were ordered for the RAN, with another five for Papua New Guinea's Australian-run coastal security force, although another six ships were ordered to bring the class to twenty vessels. The patrol boats had a displacement of 100 tons at standard load and 146 tons at full load, were in length overall, had a beam of, and draughts of at standard load, and at full load. Propulsion machinery consisted of two 16-cylinder Paxman YJCM diesel engines, which supplied to the two propellers. The vessels could achieve a top speed of, and had a range of at. The ship's company consisted of three officers and sixteen sailors. Main armament was a bow-mounted Bofors 40 mm gun, supplemented by two.50 calibreM2 Browningmachine guns and various small arms. The ships were designed with as many commercial components as possible: the Attacks were to operate in remote regions of Australia and New Guinea, and a town's hardware store would be more accessible than home base in a mechanical emergency. Acute was laid down by Evans Deakin and Company at Brisbane, launched on 26 August 1967, and commissioned on 26 April 1968.
Operational history
Acute was predominantly used for training of Royal Australian Navy Reserve personnel at Fremantle, Western Australia. From November 1978 until the 1980s, Acute was attached to the Permanent Naval Force, and was assigned to the newly completed base at. Before the Two Ocean Policy was completely implemented, the patrol boat was for several years the only warship assigned to Western Australia, and responsible for patrolling an area extending from Albany to Broome. Whilst on a training cruise in May 1983, Acute apprehended two Taiwanese fishing boats engaged in illegal fishing. This was the first such operation involving RANR personnel. Acutepaid off on 6 May 1983. She was transferred to the Indonesian Navy and renamed Silea. The patrol boat was listed in Jane's Fighting Ships as still operational in 2011.
