AIRCRAFT

A bird knocking-off rod of a bird knocking-off device is disposed outside a jet engine, in front of an air inlet of the jet engine and capable of rotating with a rotation area that is larger than an opening area of the air inlet of the jet engine. The rotary drive unit contains a rotary drive source and is capable of rotationally driving the bird knocking-off rod independently of rotation of the jet engine. Thus, bird strike against aircraft can be prevented.