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This rulemaking would convert those flammability regulations from detailed, prescriptive requirements into simpler, performance-based standards. The final rule would 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, the final rule would remove test methods from the regulations and allows applicants, in certain cases, to demonstrate compliance either without conducting tests or by providing independent substantiation of the flammability characteristics of a proposed material. Based on substantive comments received on the notice of proposed rulemaking (NPRM), the FAA would clarify its position regarding smoke emissions testing, including some changes to the cost-benefit analysis. This rulemaking would offer interested persons an opportunity to comment on changes to that NPRM.