Reference

The Mitsubishi Ki-30 Type 97 (allied code name "Ann") was developed for the Imperial Japanese Army to replace the Kawasaki Ki-3 light bomber (it was a biplane, very obsolete). ... When Japan entered WW II, the Ki-30 was withdrawn from front-line service and used as a trainer aircraft. Mitsubishi produced 618 Ki-30s and 68 were built by Tachikawa.

The Ki-30 was developed in response to a May 1936 Imperial Japanese Army specification to replace the Kawasaki Ki-3 light bomber with a completely indigenously designed and built aircraft. The second prototype's top speed of 423 km/h (263 mph) at 4,000 m (13,130 ft) led the Imperial Japanese Army Air Force to place an order for 16 service trials machines. Japanese Army Air Force Mitsubishi Ki-30 (Allied code name "Ann") bombers flying over the main line on Bataan in 1942. From late 1940, the Ki-30 was in service with the Royal Thai Air Force, and saw combat in January 1941 against the French in French Indochina in the French-Thai War. 24 aircraft were delivered, and were nicknamed Nagoya by the crews.[7] Additional Ki-30s were transferred from Japan in 1942.

Mitsubishi Ki.30 Type 97 ("Ann") This was the first Japanese light bomber to be fitted with a double-row air-cooled radial engine, variable-pitch propeller, internal bomb bay and split flaps. Even so, the Ki-30 (given the Allied codename of "Ann") was not a conspicuous aircraft. It began its operational career in 1938, and while serving in ...