 In the first three years, while the fleet consisted only of Potez 29/2 biplanes, major aircraft maintenance for Aeroput was performed by aircraft factory Ikarus in Zemun, which had licence for producing a similar plane Potez 25 for the Royal Yugoslav Air Force (JKRV).Engine maintenance was performed at the factory Jasenica AD from Smederevska Palanka, which also produced under licence aircraft engines of the Lorraine brand.Early in 1931, Aeroput acquired a workshop for the repair of the aircraft from the French - Romanian company CIDNA, which was located at Zemun airport and assembly organized with the mechanics of Ikarus and the Air Force, and on that way organized its own technical aircraft maintenance service.