Dufo (good name ...sic)
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.
***
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?).
Now that is
really worrying
My ops manual says categorically that
the aircraft must be clear of all forms of frost, ice, slush and snow before take off
except
- thin hoar frost acceptable on fuselage (static vents must be clear)
- frost up to 3mm on underside of wings in area of fuel tanks
- ridging of ice under wing is not acceptable.
Please tell me who you fly for.