A slightly improved main variant, designated as the TS-8 BII, was produced from 1958 to 1960 by WSK Mielec.

The TS-8 was an all-metal low-wing cantilever monoplane, with metal-covered semi-monocoque fuselage, oval in cross-section.

The crew of two, sat in a tandem enclosed cockpit, with twin controls, the student in front with the instructor in the rear.

The plane had no armament, except for the experimental series TS-8 BI, which had one 12.7mm machine gun and two small bomb pylons.

The TS-8s began to be withdrawn from Polish Air Force service in the mid-1960s, being replaced by PZL TS-11 Iskra jet trainers.