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In page Ikarus Orkan:

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The prototype was completed in April 1940, and the first flight was planned to be in the same month. However, due to the additional trimming, the maiden flight was made at Zemun airport on 24 June 1940. When landing, it was damaged and, due to the war in Europe, its repair took longer and it was not able to restart testings until March 1941. Flights began on 19 March 1941 and 13 flights were made by 5 April. The aircraft showed good results is to meet the expectations are set project task. Serial production did not start because of the Invasion of Yugoslavia by Germany and Italy on 6 April.