I think that he meant "plain", not "plane".
Liquid Helium is used to achieve very low temperatures -- much lower than the 77 degrees K of liquid Nitrogen. When I was using it, it was as refrigerant liquid in producing even lower temperatures. (We were experimenting with superconductivity at the time.
Enjoy, DoN.
It's in a somewhat modified cargo aircraft- a new kind of commercial surveying system. The helium just keeps the innards very cold.
Best regards, Spehro Pefhany
One possibility is to use a graphite based thread sealant, like:
The threads have to be reasonably good for that to work.
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