Re: Snow on wings

From:         Dave Lawson <dave.lawson@alliedsignal.com>
Organization: AlliedSignal Aerospace Canada
Date:         02 Jun 96 23:01:50 
References:   1
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W. Hodgins wrote:
>
> 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 wings...it was not removed and the aircraft took off
> with snow blowing off the wings as speed increased.

The key here is the concept of contaminants 'adhering' to the surface.
If the pilot can ascertain that the contaminant (in this case snow) is
not adhering, then they are allowed to depart without being de-icied.