Highfly33,
for the purpose of the discussion you started in your first post above I suggest you should leave the WAT-limits out of it. The purpose of those requirements is to define a weight limitation, which is part of the limitations of the airworthiness certificate of the airplane. The pilot is supposed to respect the weight limit, and has no business with the gradient on which it is based.
The flight path gradient is subject to wind and the AFM performance information usually presents it as as a percentage.
Flight path angle is usually expressed in degrees. The FPA presented on the PFD of a modern airplane is relative to ground, i.e. includes the effect of wind. However, in the well-known expression
"pitch angle = FPA + AoA" it is relative to the airmass.
Last edited by HazelNuts39; 8th Mar 2014 at 10:31.