Re: Snow !
AFAIK the problems with ice building up on an aircraft are
a)Extra drag & loss of lift, especially when trying to take off
b)The chance ice build up will stop the control surfaces (flaps, leading edge extensions, etc) working properly.
In order for ice to form there must be water/water vapour present in the air - at 35,000 feet & -55°C there is much less water vapour than at ground level, so the aircraft is less prone to icing up at high altitude, than it is lower down.
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