HMAS Brisbane : Gun Plot Room : State Indicator Units

The mounting bracket consists of a frame welded from L shaped beams. It consists of a rectangular base piece, two pairs of side members to a single cross-piece. An L shaped alloy panel is welded to the top of the mounting. Attached to this panel are three units. Two grey gun state indicator units, labeled MT51 (serial No. 58) and MT52 (serial No. 50) are mounted on the bracket. Both boxes have identical display arrangements ' digital lighting display on the left and numerous coloured lights (yellow, red, green and white), with a single black turn dial in the lower RH corner and two silver flick switches. Both units have a four-pin male socket plug and 14 male socket hole on the RH side of the unit. On the left of the GP gun indicators is a search programmer control panel, serial no. 110. This unit is a grey box with a black face, with a dial at the bottom and white indicator lights at the top. It also has a start/stop button in the lower RH corner and a 48 pin male socket hole on the LHS of the unit.

This component was removed from HMAS Brisbane after the ship was de-commissioned in 2001. The State Indicator Units are located in the Gun Plot Room. It is part of the Mk 68 Mod 4 Gun Fire Control System used to control the ship’s two 5 in. 54 calibre guns. HMAS Brisbane [II] was commissioned into the Royal Australian Navy in December 1967 and was the second vessel of that name to serve in the RAN. Known officially as DDG-41, Brisbane was the third of the RAN's American-built "Charles F. Adams" class guided-missiles destroyers. This class were the first major Australian warships designed and built in America, and were constructed by the Defoe Shipbuilding Co. The original complement of the Brisbane was 20 officers and over 300 sailors. Main armament was two 5-inch/54 calibre guns and anti-submarine torpedoes. The Ikara missile system was subsequently added. In later service the ship was known by the nick-name ‘the Steel Cat’. The HMAS Brisbane saw operational service in two conflicts. During the Vietnam War the ship undertook two tours of duty with the United States Seventh Fleet, in 1969 and again in 1971. The ship’s major task was to provide gunfire support for the land campaign. During the Gulf War (1990-91), Brisbane was one of four Australian warships to serve a tour in Gulf waters. The Brisbane arrived in the Gulf in December 1990 and operated there until March 1991, performing a number of roles. Apart from contributing to the anti-aircraft defences in the carrier screen, the ship also kept watch for mines and ensured that small civilian craft kept well away from the carrier group. Later, during Operation Desert Storm, the Brisbane controlled fighter combat air patrols and tanker aircraft. The ship’s final role was as an escort for US replenishment ships. In 2003 HMAS Brisbane was retired from service in the Royal Australian Navy. The Brisbane was the last steam powered ship in the RAN. HMAS Brisbane was sunk as a recreational dive wreck off the coast of southern Queensland in July 2005.