Originally Posted by
Max Angle
As I said in the post above you will not trigger climb mode by setting STD before the ACC altitude, the FMGS will reference QNH altitude below the TA that has been entered in the take-off perf. page.
This was the question I was actually asking! How does it know what the QNH altitude is? Does it go off what’s backset in the baro ref window, if you’ve already set standard? Because we don’t enter QNH anywhere on the MCDU before departure...