JET A-1 is a kerosine grade of aviation fuel suitable for most turbine-engined aicraft. It is the most common jet fuel grade available worldwide. Can be used in aircraft gas turbine engines, auxiliary power units and aero-derived ground/marine based turbine engines, for which the engine manufacturer has approved this grade of fuel. JET A-1 has requirements of two major jet fuel specifications – ASTM D1655 and DEF STAN 91-91 (NATO Code F-35). Flash point minimum value is 38°C and freezing point is -47°C.  

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This grade is the low lead version of Avgas 100. Low lead is a relative term. There is still up to 0.56 g/litre of lead in Avgas 100LL. This grade is listed in the same specifications as Avgas 100, namely ASTM D 910 and UK DEF STAN 91-90. Avgas 100LL is dyed blue. Can be used in aircraft spark-ignition piston engines, for which the engine manufacturer has approved this grade of fuel.

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