Mandau-class

Indonesia ordered four PSK Mark 5 fast attack craft from Korea Tacoma International in 1975. Designated KCR-PSK, the Mandau class is based on the South Korean PSSM design, which was derived from the United States Navy Asheville-class gunboat. The class succeeded the Kelap Lintah class and was followed by the Clurit and Klewang classes.

The vessels utilize a Combined Diesel or Gas (CODOG) propulsion system driving two shafts. A single gas turbine provides power for high-speed operations, while two diesel engines are used for cruising. The sensor suite includes a surface search radar, fire control radar, and an optronic director. Electronic warfare support is provided by an ECM suite. Armament consists of a main gun mounted forward, a secondary gun aft, and two cannons for close-in defense. The ships were designed to carry anti-ship missiles, though these may be removed as the system reaches obsolescence.

The Indonesian Navy commissioned the ships of the class between 1979 and 1980. Three vessels—Mandau, Badik, and Keris—remain in active service. The vessel Rencong was lost in September 2018. While on patrol near Sorong, West Papua, a fire broke out in the engine room after a gas turbine shutdown. The fire spread to the ammunition room, resulting in the sinking of the vessel. The class has been used for fisheries enforcement since 2015, intercepting foreign fishing boats in Indonesian waters. Operations have been conducted in the Banda Sea, the Maluku Islands, and the Celebes Sea under the Third Fleet Command.