Aircrafts have continued to fly on aviation fuels, kerosene fuel or a wide-cut fuel blended from heavy naphtha and kerosene, burned in the gas turbine combustor for many years. Because the jet aircraft is a weight-limited vechicle, a high premium is assigned to hydrocarbon fuels with a large amount of property. With aircraft fuels, the global nature of jet operations has mandated that fuel quality be closed controlled in every part of the world. Fuel properties are largely determined by the nature of the crued from which it is derived and the procedures that it is refined and distributed, It is important for refiners and distributors to know about the relationships between the properties and quality tests for aviation gas turbine fuels. Specifications for aviation fuels priscribe test limits must be met by the refiner who manufactures fuel are described in detail. Tests on receipt at airport depots and tests on delivery to the aircraft are mentioned in brief.