Václav Lim in his Formula Easter Avia AE3 in 1982.
 

A Czechoslovakian F3 car is an unlikely thought and a Czechoslovakian F3 car built by a bus manufacturer even more so, but in 1970 and 1972 it nearly happened when Avia tried constructing a chassis for the formula. The company, based in Prague, manufacture buses and heavy goods vehicles including Renault trucks built under licence and a racing project under the control of company engineer Václav Lim was initiated.

It would seem that the problem of obtaining the specialist components required for such a venture precluded any hope of success. Lim continued to build cars for Formula Easter (1.3-litre production-based engines) driving himself winning numerous races and as well as three national championships.