Originally Posted by airtren
.... are the variables/parameters determining the values of the Stall Warning Threshold function and thus the shape of the curve valid, for the entire time (X) axle in the graph?
As I said, in a given configuration SWT depends only on Mach. I have explained in a recent post how Mach etc. are calculated. The calculated speeds are the speeds that the airplane physically has in the simulation, and do not reflect any erroneous or 'invalid' speed that the systems may have 'thought' the airplane had. You have to consult the BEA Note for those. The SWT shown on the graph is valid for the 'simulation' Mach.
It is not entirely clear how the system calculates SWT in the event of erroneous or invalid airspeed. BEA#2 says that the system then sets it at the low speed value of 10 degrees. But several UAS incidents show that that does not occur. Maybe we just need to have better understanding of 'erroneous' and 'invalid'. For the NCD condition it doesn't matter where SWT is, or does it?