"As I recall, the wing anti-ice IS there to protect the leading edge - hot air is ported into the leading edge area via a 'spray tube' inside the leading edge of each wing. As a result it becomes ineffective when the leading edge flaps are extended, because the hot air simply gets dumped overboard. "
Notso, guys.....
The air is normally dumped overboard anyway. There is no connection between the cavity into which the hot bleed air is fed for anti-icing and the cavity where the LE Flaps are stowed.
More on the subject...
http://www.pprune.org/forums/showthr...threadid=77557
As far as I can see, the very limited number of slots in the underside of the LE (which vents the WTAI air after it has circulated in very front part of the leading edge) would have little or no effect on the LE Flaps.
http://members.ozemail.com.au/~b744er/WAIDucting.gif
http://members.ozemail.com.au/~b744er/LeadingEdge1a.jpg
http://members.ozemail.com.au/~b744er/WingLE.gif
Hope this helps.
Cheers.
Q.