Powered by a 12 hp Salmson AD.3 three-cylinder air-cooled radial engine, the maiden flight was made on April 17, 1924, carried out for the Aviation Forces by a German WW I ace (32 victories), Lieutenant E. Thuy. Although heavily underpowered, the aircraft had more or less satisfying flight characteristics, these being slightly improved by shifting the CofG forward.
In the summer of 1924 the aircraft was transferred to Utti military airfield, some 81 mls (130 km) north-east of Helsinki, later at Vehmaa military airfield, some 112 mls (180 km) west of Helsinki, were it was subsequently stored in 1931. Presently the sole AD 3 is preserved at the Finnish Aviation Museum.
Span: 39 ft 0.7 in (11.60 m)
Length: 17 ft 4.6 in (5.30 m)
Wing area: 145.3 sq.ft (13.5 sq.m)
Max T/O weight: 573 lb (260 kg)
Max speed: 66 mph (106 kmh)
Landing speed: 22 mph (35 kmh)
Service ceiling: 13,123 ft (4,000 m)