Approximately 25 percent of the airframe is made of carbon - fibre composites while aluminium and steel alloys are used for the rest of the structure .
Carbon - fibre composites are primarily used on control surfaces and the tail assembly .
Approximately 25 percent of the airframe is made of carbon - fibre composites , which are primarily used on control surfaces and the tail assembly , while aluminium and steel alloys are used for the rest of the structure .