![]() ![]() The APUs' ability to start depends on the viscosity of the jet fuel at such low temperatures. During these periods, the fuel's temperature drops down to ambient temperature. These APUs can be inactive for long periods (15 hours or more) at flying height. This is especially relevant for so-called Auxiliary Power Units (APUs), which are small gas turbines that need to start up on command. In order for jet fuel to endure long cold soak periods at temperatures believed to be -40☌ or lower, knowing the viscosity of jet fuel at such low temperatures becomes increasingly important. Aviation gasoline: Also known as AVGAS, only for use with piston or Wankel engines.Low volatility kerosene: Gives good thermal stability and contains only a low amount of highly volatile components like toluene or benzene.High flash point kerosene: Provides more fire security because of a min.Wide-cut fuels must fulfill a density specification, but not all of them must fulfill viscosity specifications. Wide-cut fuels: These are a mixture of kerosene and gasoline and can be used in an extended temperature range.It must fulfill viscosity specifications. Kerosene - Jet A-1 is the most common type in civil aviation, JP-8 is the military equivalent, TS-1 has improved low-temperature properties.The following aviation fuel types are available: Depending on their specific use they additionally contain additives. They consist mainly of hydrocarbons (paraffins, cycloparaffins, naphthenes, aromatics and olefins, whereby paraffins and cycloparaffins are the main components. Aviation fuels in general are fuels suitable for use in aircrafts powered by turbojet, turboprop or piston engines. ![]()
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