Dates: 1977 - 1994

HMS Active (F171) was a Type 21 frigate of the Royal Navy. Built by Vosper Thornycroft, Southampton, England, she was completed with Exocet launchers in B position, the first of the class to be so fitted.

Active participated in the Falklands War and by the mid-1980s, in common with the other surviving Type 21s, Active suffered from hull cracking. When the ship was next refitted steel plating was welded along each side of the ship to repair and reinforce the weak points. At the same time modifications were made to reduce hull noise.

Active decommissioned and was sold to Pakistan on 23 September 1994, being renamed Shah Jahan. Exocet was not transferred to Pakistan and Shah Jahan had her obsolete Sea Cat launcher removed. A Chinese LY 60N missile launcher was fitted in place of the Exocet launchers. Signaal DA08 air search radar replaced the Type 992 and SRBOC chaff launchers and 20 mm and 30 mm guns were fitted.

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