The Tachikawa Ki-55 (Allied reporting name Ida) is a Japanese advanced trainer.
The excellent characteristics of the Tachikawa Ki-36 made it potentially ideal as a trainer. This led to the development of the Ki-55. The main differences were the installation of dual controls for the instructor at the rear seat. Unnecessary equipment was removed, such as armament, radio and radio mast, bomb racks and the fuselage side observation windows. The wheel spats would often be removed as well, but not always.
After successful testing of a prototype in September 1939, the type was put into production as the Tachikawa Army Type 99 Advanced Trainer.
In all, 1,389 Ki-55 were constructed before production ended in December 1943 - with Tachikawa having built 1078 and Kawasaki 311.
Both the Ki-55 and the Ki-36 were given the Allied nickname Ida.
Francillon also mentions delivery to the Japanese satellite air force of Cochinchina, the southernmost third part of present Vietnam
Two aircraft have survived.