Also, as many of you will be aware, lift can be increased by slotting the leading edge of an aerofoil. Slats do this by creating a slot/gap between themselves and the remainder of the wing. The leading edge slot provides additional lift by delaying the upper surface separation until higher angles of attack.
Should flight in icing conditions cause build up in this slot then it negates the purpose.
As for holding in icing conditions, I would prefer to avoid than lengthily test the limits.
Also, the A380 WAI works when slats extended. As with other Airbus and Boeing aircraft previously operated.
Last edited by Rubber Dog; 17th Oct 2016 at 09:51.