AC 20-53A, Protection of Aircraft Fuel Systems Against Fuel Vapor Ignition Due to Lightning (04/12/1985)

AC 20-53A, Protection of Aircraft Fuel Systems Against Fuel Vapor Ignition Due to Lightning (04/12/1985)., This Advisory Circular provides guidance for a means of showing compliance with regulations for protection against lightning fuel vapor ignition hazards to airplane fuel systems of conventional design as well as for those involving advanced composite structures or other new technologies.