IHI started development work on the high bypass ratio turbofan engine in 1998, based on the low bypass ratio engine XF5-1. and the first prototype XF7-1 was tested from 2000 to 2002.
IHI memulai pekerjaan pembangunan mesin turbofan pada rasio bypass tinggi pada tahun 1998, berdasarkan rendah memotong mesin rasio XF5-1. dan prototipe pertama XF7-1 diuji 2000-2002.