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HMS Andromeda (F57)

Type 12I or Leander-class frigate of the Royal Navy and Indian Navy

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Construction

Andromeda was one of three Leander-class frigates ordered on 12 January 1965, the other two being Hermione and Jupiter. She was laid down at HMNB Portsmouth on 25 May 1966, launched on 24 May 1967 and commissioned on 2 December 1968 with the Pennant number F57.

Andromeda was a Batch 3, "Broad-Beamed" Leander, and as such was 372 feet (113.4 m) long overall and 360 feet (109.7 m) at the waterline, with a beam of 43 feet (13.1 m) and a maximum draught of 19 feet (5.8 m). Displacement was 2,500 long tons (2,500 t) standard and 2,962 long tons (3,010 t) full load. Two oil-fired boilers fed steam at 550 pounds per square inch (3,800 kPa) and 850 °F (454 °C) to a pair of double reduction geared steam turbines that in turn drove two propeller shafts, with the machinery rated at 30,000 shaft horsepower (22,000 kW), giving a speed of 28 knots (52 km/h; 32 mph).

A twin 4.5-inch (113 mm) Mark 6 gun mount was fitted forward. A single Sea Cat surface-to-air missile launcher was fitted aft (on the Helicopter hangar roof), while two Oerlikon 20mm cannon provided close-in defence. A Limbo anti-submarine mortar was fitted aft to provide a short-range anti-submarine capability, while a hangar and helicopter deck allowed a single Westland Wasp helicopter to be operated, for longer range anti-submarine and anti-surface operations.

As built, Andromeda was fitted with a large Type 965 long range air search radar on the ship's mainmast, with a Type 993 short range air/surface target indicating radar and Type 978 navigation radar carried on the ship's foremast. An MRS3 fire control system was carried to direct the 4.5-inch guns. The ship had a sonar suite of Type 184 medium range search sonar, Type 162 bottom search and Type 170 attack sonar, together with a Type 199 variable depth sonar (VDS).

Between 1977 and 1980, Andromeda underwent a major reconstruction, in which the ship's armament and sensors were greatly revised. The 4.5 inch gun turret, Sea Cat launcher and Limbo anti submarine mortar were removed, with a sextuple Sea Wolf surface-to-air missile launcher and four Exocet missiles fitted forward. Two triple STWS-1 324-millimetre (12.8 in) torpedo tubes allowed anti-submarine torpedoes to be launched, while the ship's hangar and flight deck were enlarged to allow a Westland Lynx helicopter to be carried instead of the smaller Wasp. A completely new radar outfit was fitted, with a Type 967 air-search radar and a Type 968 low-level air warning and surface search radar fitted back to back on the ship's foremast, and with a Type 1006 navigation radar fitted lower down on the ship's foremast. A Type 2016 long-range search sonar replaced the Type 184 sonar, while the Type 162 bottom search sonar was retained. Displacement increased to 2,790 long tons (2,830 t) standard and 3,300 long tons (3,400 t) full load, while speed dropped to 25 knots (46 km/h; 29 mph).

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