0 Members and 1 Guest are viewing this topic.
It's bloody cold up there and like houses plane windows are double glazed. Now they try to keep the air between the glazing sheets dry but I don't reckon they manage to do that for long when the outside gets so cold. so after some time the windows tend to show a few ice crystals on the inside of the outside pane when they get cold. You may have been lucky or unlucky and got a new one that was replaced becasue something had gone wrong with it and it was pretty good and dry and just didn't get any ice crystals in it at altitude.Lucky cos you got a nice new window and it had been replaced recentlyunlucky the old one had gone wrong and so may go wrong again or the job may not have been done properly anf you might have vanished off into the wide blue yonder when the window popped out!
I would have thought it would be the seals in the double glazing unit failing after a long period of heating up and cooling down between =50°C and +40°C and so expanding and contracting.