Safety device for aircraft

A safety device for an aircraft that prevents an explosion of a fuel tank storing an aviation fuel, the safety device comprising:

• a flame arrester provided within an inside of the aircraft and arranged near an end of a ventilation passage on an outer side of the aircraft, as a part of the ventilation passage allowing an inside of the fuel tank and an outside of the aircraft to communicate with each other, to prevent a flame propagation into the fuel tank from the outside of the aircraft through the ventilation passage, the outer side of the aircraft separating the inside and the outside of the aircraft;
• and
• a heat transfer reducing part provided within the inside of the aircraft and positioned on an outer peripheral part of the ventilation passage to prevent heat transfer to the fuel in the fuel tank from the flame,
• wherein the heat transfer reducing part is positioned a first distance from the outside of the aircraft, the flame arrester is positioned a second distance from the outside of the aircraft, and wherein the first distance is smaller than the second distance.