Thank you for your coments. It looks like NONE and LEM do not switch on airfoil anti-ice before take off run, while the rest do.
Knowing the advantanges and disadvantanges of both procedures, I would like to Know about the policy of diferent companies.
My company calls for take off with airfoil anti-ice switch on, when the level off altitude (engine failure procedure) is below cloud base and icing conditions are expected. So if level off altitude is 800 ft AGL and cloud base is 700 feet, we must switch on airfoil A/I prior to take off, in this way we are penalizing our RTOW limited by runway (8.000 pounds) while we are protecting the airplane just between lift-off and 35 feet. Above 35 feet climb requirements and obstacle clearance are compromise but both are independent of runway lenght.
In the scenario set above (Level off 800 and cloud base 700), if we switch on airfoil anti-ice at 800 AGL only RTOW limited by obstacle clearance will be reduced. When taking off from short runways, and flat surrondings, this second procedure allow us to take off much heavier and reach the destination without any stopover.
ANY OTHER VOTE FOR THE POLL? WHAT´S YOUR SOP?
When level off altitude is ABOVE cloud base, airfoil A/I is used in T.O..........
Sorry for the mistake.