Abstract: Taking the carbon fibre epoxy composite fuselage wall plate and its derivative structure as the research object, its flame burn-through resistance was studied through macro tests. The effects of thermal insulation and sound insulation cotton on the burn-through resistance of composite structures were compared and analysed, and the applicability of existing airworthiness provisions and compliance verification methods was discussed. The results show that the composite material and its derivative structure have good flame burn - through resistance, and can meet the compliance criteria proposed by the current burn - through resistance airworthiness verification method. The thermal insulation and sound insulation cotton can improve the thermal insulation capability of the composite wallboard. For the flammability and smoke toxicity of composite structures, necessary amendments should be done to existing provisions.

Key words: carbon fibre epoxy composite material, fire resistance and airworthiness, anti - burn through, thermogravimetric analysis