Tren thuc te may bay roi la co nhieu nguyen nhat va chi vi truc trac ky thuat khong thoi ma con do loi phi cong hay dieu kien thoi tiet va tham chi chim cung co the gay ra tai nan cho may bay hoac chien dau co! va cung vi the co khi loi do nguoi hay chim hoac la ky thuat hoac la thoi tiet va khong chung co pha hoai cung co the xay ra v.v .