HN39:
What I don't understand (can anybody help?) that the heating of the Thales pitots does apparently not prevent icing of the drains?
I think the problem with these pitot probes is not icing of the drainage path but pollution by either corrosion or dust reducing drainage efficiency or perhaps a design which satisfies current certification tests but still cannot drain fast enough the water or melted ice ingested in some high Total Water Content clouds.
DJ