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T-155 Fırtına (Fırtına meaning Storm in Turkish) is the Turkish variant of the South Korean K-9 howitzer, a 155mm self-propelled howitzer.

The T-155 Fırtına is mostly based the subsystems of the K-9; such as the German designed MTU-881 KA 500 power pack, the South Korean designed 155/52 caliber gun system and the ammunition feeding mechanism; all of which are also produced under licence in Turkey.

Even though the T-155 looks similar to the K-9, the Turkish howitzer has considerable differences in its turret design, navigation system and electronical systems (such as the radio and fire control system) which were developed in Turkey. However, as per the license agreement with Samsung Techwin, the Turkish Army is obligated to buy all ammunition for the T-155 from Korea. The first 36 T-155s were directly built in South Korea, while the next batch of 300 were licensed for production in Turkey. The total cost of purchase for the Turkish government was 1 trillion won (1 Billion USD).

T-155 Fırtına has a maximum firing range of 30 to 56 km, depending on the type of ammunition. It can reach a top speed of 66 km/h and has an operational range of 480 km.

The T-155 are built in Adapazarı, 1st Maintenance Command of the Turkish Army. Production rate of the T-155 is 24 units per year. From 2001 to December 2006, 72 units have been delivered to the Turkish Army. A total of 350 T-155 Fırtına will be produced