The Zmaj Fizir FN (Hydro or Hidro is the floatplane version) was designed for primary (initial) training of pilots. The Fizir FN had exceptional low-speed stability, a desirable trait for a training aircraft being also reliable and easy to maintain. The primary operator was the pre-WWII Yugoslav Royal Air Force but it was also widely used as a sport aircraft. This is one of only two surviving examples.

First flown in 1929, the Fizir FN was a successful Yugoslav training aircraft of which about 200 examples were built. During WWII production at the Zmaj factory in Axis-controlled Zemun, near Belgrade, continued for the Croatian air force. Some ten undelivered aircraft, including this one, were captured by Tito's forces in 1944. 9009 was used by the Yugoslav air force until 1947 and then by the national aero club as YU-CAY until around 1960. Prewar Yugoslav markings are carried.