The pilot and observer sat in tandem under a long canopy with separate sliding hoods.

A single synchronised UBS 12.7 mm machine gun and wing racks for two 100 kg (220 lb) bombs comprised the aircraft's armament.

[2] This aircraft passed state testing in October 1946, with production beginning at factories in Saratov and Leningrad in 1947.

The new aircraft had reduced fuel capacity and was unsuitable for operations on rough or snow-covered runways, and so was rejected for Soviet service, although a few units were built in Czechoslovakia as the C-11U.

[6] The Yak-11 entered service in 1947, serving as a standard advanced trainer with the Soviet Air Forces and DOSAAF.