@RotaCyclic
Or you could follow my link, 2nd from top, and find a possible solution which doesn't involved heaters or software. And it's cheap. In fact here's the text in full so no-one has to follow a link.
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If the Boeing 777 was indeed brought down at Heathrow by ice in its fuel (13 September, p 23), it would not be the first. One night in 1948 or 1949 four Royal Navy Attacker FB2 aircraft "fell out of the sky" at Royal Naval Air Station Milltown in Aberdeenshire, UK. Each had almost total loss of power in its single Rolls-Royce Nene 102 engine. In the morning we could find nothing wrong, apart from water in their low-pressure fuel filters when they were drained - about the same amount in each. They all started without trouble and were ground-run successfully. We concluded that the filters had iced up to the extent that the fuel flow had been severely impeded, but that overnight the ice had melted and the problem vanished.
Careful investigation seemed to exonerate home base fuelling arrangements from being the source of the water, so we had to look elsewhere. Much of the fuel in the Attacker was carried in an exposed, virtually uninsulated, ventral tank. This would suffer severe cooling at altitude.
Aviation fuel at room temperature contains dissolved water. We thought this might have come out of solution and formed ice on the filters. From then on it was standard procedure to add a small amount of methanol as antifreeze when refuelling the ventral tank. As far as I know, there were no further problems of this kind.
Since no one was injured and no damage done the press evinced no interest. Possibly by now there are not a lot of us left who remember the incident, but Rolls-Royce may still have the details in their archives.
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