Swedish company ASJA bought an RK-26 as a pattern aicraft in 1931, for license production. The Swedish Air Force ordered 25 of these aircraft from ASJA for training purposes. The type was designated as Sk10 and served between 1932 and 1945. Serial 536 was delivered to F5 in December 1934 and transferred to F1 in 1942. It was retired in December 1944 and went to the excellent collection in Malmen. It is said to be the only RK-26 left in the world.

The RK-26 was a German twin-seat biplane trainer designed at the end of the 1920s. In December 1930 an agreement was signed for license production of the aircraft by the Swedish aircraft manufacturing company ASJA as the Flygvapnet was in need of a new trainer. They later ordered 25 aircraft and it was given the designation Sk 10. The plane was in service between 1932 and 1945 but was unpopular, as changes in the design that made the aircraft much heavier than the original, changing the flight characteristics drastically. Of the 25 delivered aircraft, 18 were w/o and this is the only survivor.