The fourth-generation aircraft is used as an attack weapon. The voyage needs to be guaranteed. In addition to the air-to-air demand, the basic design is absolutely set for air superiority, and the amount of bomb is sacrificed in exchange for maneuverability and voyage. This is because the light four generations of the body is difficult to use as a formal multi-role aircraft while taking into account the air and land missions, but the small country power is not enough to support the two air-to-ground fighters, even if it is pure air, the amount of bombs is also Very limited, so the modular design, so that the fighter can be turned into air or opposite, but not like the all-in-one multi-function machine, (in addition to the bomb) can be multi-functional without changing any configuration Therefore, FCK-2 is not called "multi-purpose warfare" but "modular fighter"Not called "multipurpose warfare" but "modular fighter"