HMAS Adelaide (FFG 01) was the lead ship of the of guided missile frigates built for the Royal Australian Navy (RAN), based on the United States Navy's s. She was built in the United States and commissioned into the RAN in 1980.

During her career, Adelaide was part of Australian responses or contributions to the 1987 Fijian coups d'état, the Iraq invasion of Kuwait, the Indonesian riots of May 1998, the INTERFET peacekeeping taskforce, the War in Afghanistan, and the United States-led invasion of Iraq. In 1997, the frigate rescued two competitors in the 1996–97 Vendée Globe solo, round-the-world yacht race. In 2001, a boat carrying suspected illegal immigrants was intercepted by Adelaide; the events of this interception became the centre of the Children overboard affair.

In 2008, Adelaide was the second ship of the class to be decommissioned, in order to offset the cost of an upgrade to the other four vessels. This ship was to be sunk off Avoca Beach, New South Wales as a dive wreck on 27 March 2010, until an appeal to the Administrative Appeals Tribunal by protest groups led to a postponement of the scuttling until additional cleanup work was completed. Despite further attempts to delay or cancel the scuttling, Adelaide was sunk off Avoca on 13 April 2011.

Design and construction

Following the cancellation of the Australian light destroyer project in 1973, the British Type 42 destroyer and the American were identified as alternatives to replace the cancelled light destroyers and the s.Jones, in Stevens, The Royal Australian Navy, p. 220 Although the Oliver Hazard Perry class was still at the design stage, the difficulty of fitting the Type 42 with the SM-1 missile, and the success of the acquisition (a derivative of the American ) compared to equivalent British designs led the Australian government to approve the purchase of two US-built Oliver Hazard Perry-class frigates (including Adelaide) in 1976.Frame, Pacific Partners, pp. 102, 162 A third was ordered in 1977, followed by a fourth, with all four ships integrated into the USN's shipbuilding program.Frame, Pacific Partners, p. 162MacDougall, Australians at war, p. 345Hooton, Perking-up the Perry class A further two ships were ordered in 1980, and were constructed in Australia.

As designed, the ship had a full load displacement of 3,605 tons, a length overall of , a beam of , and a draught of .Moore (ed.), Jane's Fighting Ships 1977–78 , p. 25 Early in the ship's career, she was modified from the Oliver Hazard Perry Flight I design to Flight III, requiring a lengthening of the helicopter deck for the RAST helicopter recovery system, increasing the displacement to 4,100 tons and pushing the overall length to . Propulsion machinery consisted of two General Electric LM2500 gas turbines, which provided a combined to the single propeller shaft.Sharpe (ed.), Jane's Fighting Ships 1998–99, p. 26 Top speed was , with a range of at . Two electric auxiliary propulsors were used for close manoeuvring, with a top speed of . The standard ship's company was 184, including 15 officers, but excluding the flight crew for the embarked helicopters.

The original armament for the ship consisted of a Mark 13 missile launcher configured to fire RIM-66 Standard and RGM-84 Harpoon missiles, supplemented by an OTO Melara gun and a Vulcan Phalanx point-defence system. For anti-submarine warfare, two Mark 32 torpedo tube sets were fitted; originally firing the Mark 44 torpedo, the Adelaides later carried the Mark 46 torpedoes. Up to six machine guns were carried for close-in defence, and beginning in 2005, two M2HB .50 calibre machine guns in Mini Typhoon mounts were installed when needed for Persian Gulf deployments.Scott, Enhanced small-calibre systems offer shipborne stopping power The sensor suite included an AN/SPS-49 air search radar, AN/SPS-55 surface search and navigation radar, SPG-60 fire control radar connected to a Mark 92 fire control system, and an AN/SQS-56 hull-mounted sonar. Two helicopters could be embarked: either two S-70B Seahawk or one Seahawk and one AS350B Squirrel.

Adelaide was laid down to the Oliver Hazard Perry class' Flight I design at Todd Pacific Shipyards at Seattle on 29 July 1977, launched on 21 June 1978 by Lady Ann Synnot (wife of Chief of Naval Staff Admiral Sir Anthony Synnot), and commissioned into the Royal Australian Navy on 15 November 1980.Perryman, Ships Named Adelaide, p. 2 During construction, she was identified with the United States Navy hull number FFG-17. A total of four Adelaide-class ships were constructed by Todd Pacific, with a further two built by Australian shipbuilder AMECON.

Operational history After commissioning, Adelaide and Canberra remained in the United States to work up; during this time both ships were attached to the United States Navy's Destroyer Squadron 9. The frigate ran aground off Seattle in early 1981, during post-commissioning trials, but was freed with only minor damage.

Following the decommissioning of the aircraft carrier in 1982 and the disbandment of fixed-wing aviation squadrons in 1984, the RAN Fleet Air Arm became focused on helicopter operations, but had minimal experience flying helicopters from small ships.Jones, in Stevens, The Royal Australian Navy, p. 247 To remedy this, a Bell Kiowa was embarked aboard Adelaide during 1984. Adelaide was awarded the Gloucester Cup for being the most efficient ship in the RAN during 1984.

In May 1987, Adelaide visited Fiji, and was alongside in Lautoka when the first of the 1987 Fijian coups d'état occurred on 14 May.Jones, in Stevens, The Royal Australian Navy, p. 260 Adelaide and sister ship , alongside in Suva, were instructed to remain off Fiji to aid in any necessary evacuation of Australian citizens; the first component of what became Operation Morris Dance. Adelaide remained on station until at least 29 May, when a phased withdrawal began.

On 3 July 1990, Adelaide became the first Australian warship to visit Tahiti since 1970.Bendle et al., Database of Royal Australian Navy Operations, 1990–2005, p. 6 On 10 August, Adelaide, sister ship , and the replenishment ship were deployed to the Middle East as part of Operation Damask, Australia's participation in the international coalition enforcing sanctions against Iraq following that nation's invasion of Kuwait.Jones, in Stevens, The Royal Australian Navy, p. 261 Adelaide and Darwin remained in the area until 3 December, and was used for surveillance and boarding operations.Jones, in Stevens, The Royal Australian Navy, p. 263 In October 1992, Adelaide home port was changed to , making her the first ship of the class homeported in Western Australia under the Two-Ocean Policy.Perryman, Ships Named Adelaide, p. 3

In January 1997, the yachts of Thierry Dubois and Tony Bullimore (competitors in the 1996–97 Vendée Globe solo, round-the-world yacht race), capsized while attempting to cross the Southern Ocean.Grazebrook, A Drop in the Ocean? Adelaide successfully found and rescued the sailors after seven days of searching by ships and aircraft. During late May and early June, the frigate was deployed to the Philippines, and represented Australia at the Philippines Centenary International Naval Review.Bendle et al., Database of Royal Australian Navy Operations, 1990–2005, p. 28

Between 17 and 27 May 1998, Adelaide was one of four RAN ships placed on standby, in case Australian citizens required evacuation if the Indonesian riots of May 1998 escalated.Bendle et al., Database of Royal Australian Navy Operations, 1990–2005, p. 34 The ships were not used. Starting in September, the frigate accompanied the destroyers and on a cruise through South East Asia.Bendle et al., Database of Royal Australian Navy Operations, 1990–2005, p. 35 During this deployment, the ships were present at a naval review by Indonesian president B. J. Habibie.

In February 1999, Adelaide was awarded the Duke of Gloucester Cup awarded to the most efficient ship in the RAN during the previous year.Adelaide's pair of cups, in Navy News The frigate was deployed to East Timor as part of the Australian-led INTERFET peacekeeping taskforce from 19 September to 19 October.Stevens, Strength Through Diversity, p. 15

On 6 October 2001, Adelaide was the ship which intercepted SIEV 4, the event which sparked the Children overboard affair.Senate Select Committee, A Certain Maritime Incident Under orders to prevent SIEVs from entering Australian waters, Adelaide attempted to warn the craft, carrying over 200 passengers (including children), against crossing from international waters during the night and into 7 October. When the SIEV failed to heed these warnings, Adelaide fired warning shots and initiated a RHIB boarding action, with the boarding party took control of the craft that afternoon. Between this time and when the craft was manoeuvred from Australian territory late the next morning, several attempts were made to sabotage the craft, and some adult passengers jumped or were thrown overboard while others threatened to do so; the fourteen people that entered the water were recovered by the frigate's RHIB and taken back to the SIEV. Adelaide observed the craft as it headed towards Indonesia, and moved in to provide further assistance a few hours later, after systematic sabotage immobilised the small vessel. Adelaide was instructed to take the vessel in tow and head for Christmas Island. The SIEV began to take on water during the afternoon of 8 October, and despite the appearance that the problem had been rectified, the craft sank without warning at 17:00. All aboard were forced into the water, and were rescued by personnel from Adelaide. Reports of the sinking were conflated with information about those who jumped or were thrown overboard the day previous to give the impression that the threat of throwing children overboard had been made or carried out, a story that was later proven false but taken up at the time by the Howard government during the lead-up to the 2001 election to support their campaign promises to tighten border controls and immigration.Senate Select Committee, Executive Summary

From November 2001 to March 2002, Adelaide and the amphibious warfare ship were deployed to the Middle East as part of Operation Slipper, the Australian contribution to the War in Afghanistan.Bendle et al., Database of Royal Australian Navy Operations, 1990–2005, p. 44 The ships also contributed to the continuing enforcement of the Iraq sanctions. Adelaide was deployed on border protection operations on multiple occasions until 2004.