On display at Gifu-Kakamigahara Air and Space Museum. Japan's National Aerospace Laboratory converted a C-1 for STOL tests and to reduce the noise footprint. Four newly-built FJR710/600S turbofans were mounted on top and ahead of the wings to generate lift using the Coandă effect by upper surface blowing (USB) through vortex generators onto the flaps. The sole Asuka or 'flying bird' was retired in March 1989 after 97 flights and 167 flight hours, achieving 509m for takeoff and 449m for landing.