First thanks to everybody for your contributions. I have asked the question not because I don't know the JAR 25-333 or the FAR but because of this strange position of points A1 and A2, sure I am teaching the basic(Vs and n) but it is my job of instructor to answer as deeply as possible to any question from my students when they request an explanation. Sorry, it is not my philosophy to give the minimum: I have been a civil crew member during 25 years and I respect my ex-colleagues and my junior colleagues: the ground school is not only helping youngs to pass an exam, it is also providing foundations for a whole long professional career and the following phase of instruction (type rating/simulator) reveals quite often a too weak instruction. Coming back to the question, I understand that - until another better explanation-points A1 and A2 correspond to a lighter weight at which the described manoeuver is done.
Thanks to everybody
