HMS Active (F171)

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HMS Active
Career (UK) RN Ensign
Name: HMS HMS Active (F171)
Operator: Royal Navy
Builder: Vosper Thornycroft
Laid down: 23 July 1971
Launched: 23 November 1972
Commissioned: 19 July 1977
Decommissioned: 23 September 1994
Motto: Festina lente
("Hasten slowly")
Fate: Sold to Pakistan on 23 September 1994
Career (Pakistan) Pakistan Naval Jack
Name: PNS Shah Jahan
Operator: Pakistan Navy
Acquired: 23 September 1994
Fate: Active in service as of 2008
General characteristics
Class and type: Type 21 frigate
Displacement: 3,250 tons full load
Length: 384 ft (117 m)
Beam: 41 ft 9 in (12.7 m)
Draught: 19 ft 6 in (5.9 m)
Propulsion:

COGOG:
2 × Rolls-Royce Olympus gas turbines

2 × Rolls-Royce Tyne RM1A gas turbines for cruising
Speed: 32 knots (59 km/h)
Range: 4,000 nautical miles at 17 knots (7,400 km at 31 km/h)
1,200 nautical miles at 30 knots (2,220 km at 56 km/h)
Complement: 177
Armament: RN:
1 × 4.5 inch (114 mm) Mark 8 naval gun
2 × Oerlikon 20 mm cannon
4 × MM38 Exocet missiles
1 × quadruple Sea Cat SAMs
2 × triple ASW torpedo tubes
2 × Corvus chaff launchers
1 × Type 182 towed decoy
Pakistan:
1 × 4.5 inch (114 mm) Mark 8 naval gun
2 × Oerlikon 20 mm cannon
1 × LY-60N missile launcher
2 × triple ASW torpedo tubes
2 × Mark 36 SRBOC chaff launchers
1 × Type 182 towed decoy
Aircraft carried: 1 × Westland Wasp helicopter, later refitted for 1 × Lynx

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.

Shah Jahan remains in service with the Pakistan Navy.

[edit] See also

Bristol Group

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