Allende-class frigate

All four frigates of the class at Tuxpan, 12 June 2009
Class overview
Name	Allende class
Builders	Todd Shipyard, Seattle and San Pedro Lockheed Shipbuilding and Construction Company Avondale Shipyard
Operators	Mexican Navy
In commission	1998–2016
Completed	4
Laid up	3
Retired	1
General characteristics
Type	Multi-purpose anti-submarine frigate
Displacement	3,011 long tons (3,059 t) standard 4,260 long tons (4,328 t) full load
Length	439 ft 6 in (133.96 m)
Beam	46 ft 8 in (14.22 m)
Draught	24 ft 8 in (7.52 m) max
Installed power	2 × Combustion Engineering/Babcock & Wilcox boilers
Propulsion	1 Westinghouse steam turbine 35,000 shp (26,000 kW)
Speed	27 knots (50 km/h; 31 mph)
Range	4,300 nmi (8,000 km; 4,900 mi) at 22 knots (41 km/h; 25 mph)
Complement	288
Sensors and processing systems	SPS-10 or SPS-67 surface search radar SPS-40B air search radar SQS-26 CX hull mounted LF sonar SPG-53F fire control radar TACAN SRN-15A; Mk 114 ASW fire control system Mk 68 gunfire fire control system
Armament	1 × 5 in (127 mm)/54 cal. Mk 42 DP gun; 2 × twin fixed MK 32 Mod. 9 324 mm (13 in) torpedo launchers Mk 25 BPDMS launcher for Sea Sparrow missiles (Allende only)
Aircraft carried	1 MBB Bo 105 helicopter
Aviation facilities	One helicopter hangar and helipad
Notes	Ex-Knox-class US ocean escort frigates

The Allende class is a series of four anti-submarine frigates used by the Mexican Navy. Allende-class frigates are former United States Navy Knox-class-ships which were acquired beginning in 1997. They form the Mexican Gulf Fleet of the Mexican Navy. They are used for anti-submarine and offshore patrol duties. All four ships were taken out of service by 2016 and one was sunk as an artificial reef in 2022. In 2024, it was announced the other three hulls would be donated for use as artificial reefs.