Originally Posted by
Friendly Pelican
What I want to know is whether the FMGC takes current primary altimeter QNH into account when calculating the fix and derived profile, or whether the FMGC looks at QNH set in the APP page. (I have my thoughts, but I'd like them confirmed...)
Hello,
No it does not look at the QNH set in the perf page and nor the temperature. That’s why when using Final APP you have a low temperature limitation. It’s critical you set the correct QNH on EFIS as a wrong QNH will put you high or low on profile.
The QNH you insert on the perf page is only used for cabin repressurisation segment.