UTI MiG 15 / ST-2

The need to train pilots to fly at night or in adverse weather conditions led to several engineering modifications of the UTI MiG-15. The most noteworthy upgrading was the installation of the OSP-48 instrument landing system; to make room, the NR-23 cannon was removed and the capacity of fuel tank no. 1 was reduced. The instrument panel was completed with a KI-11 additional compass, and the cockpit pressuriza­tion system was fitted with a filter. On the other hand, the outlet port for spent links and cartridge cases from the UBK-E machine gun was changed to prevent it from jamming when firing. A newer gunsight, the ASP-3N (the same one used in the MiG-15), replaced the ASP-1 of the ST prototype. These modifications marked the birth of the ST-2.

After certification tests at the GK Nil WS, the ST-2 became the new master aircraft on the UTI MiG-15 production line.