A requirement for the fuel tank safety nowadays on modern airliners is the nitrogen generation system, it is to allow the fuel tanks to be less flammable, nitrogen generation system is simply a filter to convert air to nitrogen and push this nitrogen into the Ullage of fuel tanks, nitrogen is safe, inert and less susispitible to temperature change, nitrogen generation system is a basic requirement for SFAR88 led by FAA, we need to make the fuel tanks to be less flammable by the NGS.
