Ahmad Yani-class frigate

The Ahmad Yani class of six general-purpose frigates were acquired by the Indonesian Navy in the 1980s. They were originally built in the Netherlands for the Royal Netherlands Navy as the Van Speijk-class frigate which were licence-built versions of the British Leander-class frigate.

Operational history
In 1992, KRI Ki Hajar Dewantara, along with KRI Yos Sudarso and KRI Teluk Banten intercepted the Portuguese ship Lusitania Expresso in East Timor. Col. Widodo, deputy assistant of the Indonesian Navy´s Eastern Fleet, told Radio Republik Indonesia from aboard the Indonesian warship KRI Yos Sudarso that the ferry entered Indonesian waters at 5:28 a.m. local time on March 11, 1992. At 6:07, the Lusitania Expresso had traveled 2 to 3 nmi into Indonesian territory and Captain Luis Dos Santos (Lusitania Expresso's captain) was ordered to leave immediately. Col. Widodo said the Portuguese ship captain obeyed the order and turned his ship around and headed back to sea.

Modernisation
All six frigates have had their steam turbine power plants replaced with marine diesel engines.

The frigates of the Ahmad Yani class are due to be replaced by the Martadinata-class frigates (SIGMA PKR 10514); the first of which, Raden Eddy Martadinata (331), was commissioned on 7 April 2017.