LightTwin driver wrote:
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I don't know of any airline of any size that permits you to take off with snow on upper wing surfaces-tell me if you know different.
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Actually - but not regarding snow specifically - this is from our OM-A:
8.2.4.5 Necessity for de-icing
An aircraft has to be de-iced if:
• the ice coverage is thicker than 3 mm
• white frost or ice forms on the bottom of the wing in the fuel tank area during precipitation during
ground time
• presence of clear ice is observed
So yes, we ARE indeed ALLOWED to go with up to 3mm of ice (but not snow?).