On Dec 24, 8:28 am, Jose wrote:


Which got me thinking - maybe the FAA isn't so crazy after all. If frost can form while the plane is just sitting there, why could it not form while the plane is flying? (yeah, there's some frictional heating, but we could lower the temp a bit more, no?) And if frost isn't such a good thing to have on takeoff, it's probably not so good in flight either.

The frost on your wings was most certainly formed after your landed.
It happened to me a few times on some very clear cold days. I fly a
low wing Grumman and I could see the frost started to form as I slowly
taxi back to the ramp.

If you depart in such condition, it would be a good idea to spray
propylene glycol (RV antifreeze, not the automobile antifreeze) on
your wings and horizontal stablizers before taxi out, after you clear
out all the frost.