Hi,
Thank's for all and you Bestglidespeed...interesting debate and a real good occasion to review some basic...
In addition to all doc's already proposed I'd like to submit this one..which I consider really well made by the French authorities..
Ill try to find it in english..but no success..anyway the pictures are talking by themselves..
http://www.sia.aviation-civile.gouv...._CHAP02_V3.pdf
Don't hesitate for any translation required..
rgds