G-class frigate

The G class (Turkish: Gabya sınıfı fırkateyn(ler)) is one of the frigate classes of the Turkish Navy. They are extensively modernized versions of ex-Oliver Hazard Perry-class guided-missile frigates of the US Navy, mainly designed for air defense with a weapons configuration that is optimized for general warfare.

TCG Göksu (F-497) in the Mediterranean Sea on August 21, 2023. The G-class frigates are equipped with the GENESIS combat management system, SMART-S Mk2 3D radar and Mk. 41 VLS, which has been installed in front of the Mk. 13 GMLS.
Class overview
Name	G class
Operators	Turkish Navy
Preceded by	N/A
Succeeded by	Yavuz class
Subclasses	Oliver Hazard Perry class
Built	1979-1981
In commission	1997-present
Planned	8
Completed	8
Active	8
General characteristics
Type	Frigate
Displacement	4,100 long tons (4,166 t) full load
Length	135.6 m (444 ft 11 in)
Beam	13.7 m (44 ft 11 in)
Draught	6.7 m (22 ft 0 in)
Propulsion	2 × GE LM 2500 gas turbines, 41,000 hp (31 MW) 1 propeller and 2 × bow thrusters
Speed	30 knots (56 km/h; 35 mph)
Range	5,000 nmi (9,300 km) at 18 kn (33 km/h)
Complement	222 (19 officers, 203 men)
Sensors and processing systems	Combat Management System: GENESIS (Gemi Entegre Savaş İdare Sistemi)[1] Search radar: SMART-S Mk2[2]
Armament	1 × Mk 15 Phalanx CIWS 1 × Oto Melara 76mm DP gun 8 × Harpoon SSM 40 × SM-1 MR SAM 32 × ESSM launched from Mk-41 VLS[3] (4 ESSM missiles per MK-41 cell through the use of MK25 Quadpack canisters, total of 8 cells)[4] Two triple Mark 32 Anti-submarine warfare torpedo tubes with Mark 46 or Mark 50 anti-submarine warfare torpedoes
Aircraft carried	1 × S-70B Seahawk or AB-212 (ASW/ASuW/EW)

Modernization

The G-class frigates have undergone a major modernization program which included the retrofitting of a Turkish digital combat management system named GENESIS (Gemi Entegre Savaş İdare Sistemi).^[5] The system was designed and implemented jointly by the Turkish Navy and HAVELSAN, a Turkish electronic hardware systems and software company.^[6] The first GENESIS upgraded ship was delivered in 2007, and the last delivery is scheduled for 2011.^[7][8]

The GENESIS advanced combat management system includes the following characteristics and abilities:^[9]

• A modern and reliable system
• High performance
• Open architecture
• Capacity of tracking more than 1,000 tactical targets
• Modern digital sensor data fusion
• Automatic threat evaluation
• Weapon engagement opportunities
• Link-16/22 system integration

The modernization program also includes:

• The addition of an 8-cell Mk-41 VLS for Evolved Sea Sparrow, including the upgrade of the Mk-92 fire control system by Lockheed Martin^[10]
• The retrofitting of a new advanced SMART-S Mk2 3D air search radar^[2] to replace AN/SPS-49
• The addition of a new long range sonar^[11][12]

The Mk-41 vertical launching system (VLS) has been fitted in front of the Mk.13 launcher, similar to their installation on the Adelaide-class frigates of the Royal Australian Navy, which are Australian-built derivatives of the Oliver Hazard Perry-class frigates. TCG Gediz became the first ship in the class to receive the Mk 41 VLS installation.^[3]

The "short hull" ex-Perry class frigates that are currently being operated by the Turkish Navy were modified with the ASIST landing platform system at the Istanbul Naval Shipyard, so that they can accommodate the S-70B Seahawk helicopter.

Ships

• TCG Gaziantep (F 490) ex-USS Clifton Sprague (FFG-16)
• TCG Giresun (F 491) ex-USS Antrim (FFG-20)
• TCG Gemlik (F 492) ex-USS Flatley (FFG-21)
• TCG Gelibolu (F 493) ex-USS Reid (FFG-30)
• TCG Gökçeada (F 494) ex-USS Mahlon S. Tisdale (FFG-27)
• TCG Gediz (F 495) ex-USS John A. Moore (FFG-19)
• TCG Gökova (F 496) ex-USS Samuel Eliot Morison (FFG-13)
• TCG Göksu (F 497) ex-USS Estocin (FFG-15)

In addition, the ex-USS Duncan (FFG-10) was sold to the Turkish Navy as a parts hulk.

See also

• List of major surface ships of the Turkish Navy