Jet Fuel does not "Jell". Ever. Nor does it reach its freezing point until it reaches -47C (-52.6F) in the case of JetA-1 or -40C (-40F) in the case of JetA. Any water in the fuel will, of course, freeze at the freezing point of water. To keep ice crystals from entering fuel lines and filters various methods are employed. Fuel filter heaters usually utilizing fuel/engine oil heat exchangers is one method to keep ice crystals out of the filters. Use of anti-icing agents such as prist is a standard procedure although in some cases the prist is not added to the fuel until it is being pumped into the aircraft fuel tanks. To prevent the fuel from cooling to its freezing point hydraulic lines are sometimes routed through the aircraft fuel tanks. "Fuel Temp Low" caution lights are also standard so the crew can take steps to increase the fuel temp. Fly lower, faster, transfer fuel between tanks, etc. I only know of one airline crash that occurred due to fuel line ice. Rolls Royce got the blame for that one and had to redesign the fuel filter heaters. It was a B777 operated by British Airways. GE and Pratt/Whitney engines didn't have a problem.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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