The Romanian Army first purchased the P.11 as the P.11b from Poland, and then licensed it. Production began at IAR in Romania in 1936; the machine being produced at the time was equipped with a 610 horsepower 9Krse engine. The Romanian production type is known as P.11F, and 70 were produced. Romania liked the P.11 series, and also produced the advanced P.24; the later IAR-80, etc., were based on the structure of the P.11