This apparatus is used for the determination of the freezing point of aviation fuels in controlled laboratory conditions. The temperature of the fuel in the aircraft tank normally falls during flight depending on aircraft speed, altitude, and flight duration. The freezing point of the fuel must always be lower than the minimum operational tank temperature. This test method covers the determination of the temperature below which solid hydrocarbon crystals may form in aviation turbine fuels (ATF) and aviation gasoline. The fuel temperature at which solid hydrocarbon crystals, formed on cooling, disappear when the temperature of the fuel is allowed to rise under specified conditions of test is recorded as per ASTM D 2386, IP 16 test method.