Plane was built for landing on unprepared fields and its STOL characteristics include leading edge fixed slats, flaps and drooping ailerons. The cockpit is equipped with two flight controls. The right front and rear seats in the older version of the plane were able to accommodate two stretchers. The aircraft had floats to land on water, but they could have been exchanged for snow skis. 130 UTVA-66 aircraft were manufactured. The last aircraft were withdrawn from military service in 1999.