Not a good idea to have it freeze you could blow the wing up.

Fly with out water.

More likely to freeze in winter.

Flight level 235 in August was -30oC
http://www.mals.net/bunyan04/pages/Picture%20013.htm the grease starts to
freeze.

Mal

www.mals.net


"JohnWN in Burke, VA" wrote in message
news:41FSd.689$2s.199@lakeread06...
I have only flown as a passenger once in a sailplane, and thus, will ask
the obvious question. Is water blast used in temperatures where it is
likely to freeze? If so, what is done to prevent this?

Thanks ...john