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Flight testing of the first prototype began in 1931, with the second prototype following in 1932, competing in that year's International Air Meeting in Warsaw and the 1932 Salon de l'Aeronautique at Paris.
Between 22-31 July 1932 he took part in the 3rd International Air Meeting in Zurich (or "Alpen rally"), flying a prototype fighter PZL P.11, and he came second (the first place of the Yugoslavian pilot was debated, because of using additions for fuel).