This standard specifies the test method for evaluating the combustion performance and flame spread characteristics of thermal and acoustic insulation materials under the combined effects of a radiant heat source and flames. The testing described in the standard typically requires specialized flame spread test equipment for thermal and acoustic insulation materials. Its core involves applying a standard heat radiation flux to the sample using an inclined radiant panel, while simultaneously igniting it with an open flame from a propane burner. This simulates and assesses the combustion and flame spread behavior of the material in actual fire scenarios. The method is primarily applicable to aviation thermal and acoustic insulation materials, such as aircraft cargo compartment liners, and is of significant importance for ensuring aviation safety.