{| |} The SET 3 was a military trainer aircraft developed in Romania in the late 1920s. It was a conventional single-bay biplane with unstaggered wings of equal span. It was equipped with fixed tailskid undercarriage, and the pilot and instructor sat in tandem, open cockpits. The design was submitted to the Romanian Air Force for consideration, and elicited sufficient interest to result in an order for two prototypes to be placed. Upon delivery, one of the aircraft was used for flight tests, while the other was tested on the ground. After nearly a year, an order for 10 aircraft was placed, which were delivered to the air force's pilot training school at Tecuci. The new trainer soon found recognition, flown by SET chief test pilot Gheorghe Stefanescu to first place in the aerobatics competi