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The FAA is amending certain airworthiness regulations for fire protection of interior compartments on transport category airplanes. These amendments convert those flammability regulations from detailed, prescriptive test requirements into simpler, performance-based standards. These amendments divide these standards into two categories: those designed to protect the airplane and its occupants from the hazards of in-flight fires, and those designed to protect the airplane and its occupants from the hazards caused by post-crash fires. In addition, these amendments remove test methods from the regulations and allow applicants, in certain cases, to demonstrate compliance either without conducting tests or by providing independent substantiation of the flammability characteristics of a proposed material. This action eliminates unnecessary testing, increases standardization, and improves safety. These amendments include conforming changes to parts 25, 27, 29, 91, 121, 125, and 135.