Snow on wings

From: (W. Hodgins)
Organization: Axess Communications, Montreal, Canada
Date:         09 May 96 12:50:19 
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Some time ago I was a passenger on a DC-9 flight out of Toronto in
January as I recall. Looking out the window, I noticed a fair amount
of snow on the was not removed and the aircraft took off
with snow blowing off the wings as speed increased.
I used to fly light aircraft in the early 70's and if I recall
correctly we were supposed to ensure that nothing, not even frost,
should be allowed to accumulate on the wings.
What is the criteria for large an accumulation of light snow
normally acceptable ?