The RTAF-4 was developed from the
de Havilland Canada DHC-1 Chipmunk that were used by the
Royal Thai Air Force. Production began in February 1971 and the prototype made its first flight on 25 September 1972. The plane, with redesigned cockpit and tail sections, had a payload of 345 kg and its maximum gross weight for aerobatics was 1,044 kg. 12 aircraft were produced, that entered into service in 1974, four of which were used as trainers for the Civil Aviation Department of the Thai Air Force. One unit has been preserved at the
Royal Thai Air Force Museum,
Don Mueang,
Bangkok. ==Operators==