The flight revealed a bevy of deficiencies that grounded the initial prototype for some time. During this lull, Tachikawa moved on constructing another aircraft to the same specifications which produced what would become just the second of two total prototypes for the Ki-77 line. With a crew selected and trained for the adventure ahead, and some of the more major issues ironed out in the aircraft, the flight was formally launched on July 7th, 1943 from an airstrip in Singapore.
As it was, Allied intelligence had been alerted through German communications of the long distance flight and were promptly dispatched to meet the journeying Ki-77. It is believed that the Japanese flight was doomed by their run in with the British who dispatched the unprotected enemy aircraft somewhere over the Indian Ocean. The Tachikawa aircraft carried a crew of eight including three Army officers personnel.
The second Ki-77 was utilized in a record-setting long distance attempt from 1944 onwards which it unofficially managed over Japanese controlled territories prior to the end of the war. At the time of the Japanese surrender in August of 1945, the Ki-77 has survived the Allied bombing campaign and thus taken over by the Americans to which it was transport stateside for inspection during 1946 before being dismantled and scrapped. As such, the Tachikawa Ki-77 fell into aviation history without much fanfare to its name.
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