Abstract: Aviation coolant is a combustible liquid used in aircraft engine and electronic equipment at work. It usually used in the high temperature ambient, the fire hazard of aviation coolant is often neglected in the study of oil fire risk. Therefore, sequences of experiments were conducted to study fire hazard of aviation coolant in this paper. The flash point of coolant was tested by the flash point meter and the hazard was graded. The combustion characteristics of coolant were studied based on the cone calorimeter and the basic fire parameters is obtained. The ignition time of coolant is fitted by Janssens' model and the critical ignition heat flux was obtained. Based on the thermal hazard model proposed by PETRELLA R V et al, X parameter of coolant combustion was obtained and its thermal hazard was classified.

Key words: aviation coolant, fire hazard, flash point, heat release rate, ignition time, combustion characteristic