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64.18 Turbine Engine Fuel Systems
64.18.2 Describe the distinguishing features of aviation turbine fuel (AVTUR/Jet A1).
AVTUR — Jet A-1
AVTUR (Jet A-1) is a kerosene-based fuel commonly used in turbine engines.
Its main characteristics include:
Appearance
Jet A-1 is normally clear and colourless to pale straw in appearance.
Lower Volatility
Jet A-1 is less volatile than aviation gasoline, meaning it evaporates less readily.
This reduces vapour formation and makes it less susceptible to vapour lock.
Higher Flash Point
Jet A-1 has a minimum flash point of approximately 38°C.
This makes it less readily flammable during normal handling than aviation gasoline, although its vapour can still ignite under suitable conditions.
Low Freezing Point
Jet A-1 has a maximum freezing point of approximately −47°C.
This allows the fuel to remain usable at the low temperatures encountered at altitude.
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