Operational History
The first aircraft were produced in a factory in Tbilisi in October 1949. In late 1949 they entered Soviet air force service, and were also ordered for export in 1949-50. The Yak-23 was quickly replaced in the Soviet service with the more complicated swept-wing MiG-15, which offered superior performance. In all, only 310 Yak-23 aircraft were built before production ended in 1950. Apart from the fighter there were two trainer versions of the Yak-23 which were built in small numbers. The Yak-23UTI two-seat trainer which appears to have had the unusual arrangement of having the instructor sat in front of the student, and the Yak-23DC trainer which was produced in Rumania.
Small numbers of Yak-23 were exported to Czechoslovakia (20 from 1949, named S-101), Bulgaria (from 1949), Poland (about 100, from 1950), Romania (62, from 1951) and probably Albania. Poland and Czechoslovakia acquired license of Yak-23, but didn't start production in favour of the MiG-15. Yak-23s were withdrawn by the late 1950s. They were not used in combat (there are reports of US pilots encountering Yak-23s during the Korean War, but their presence in North Korea is not confirmed).
Read more about this topic: Yakovlev Yak-23
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