Originally Posted by
Lear Jockey
always fly in QFE!! Only one question as the FMS is calibrated for QNH altitudes, we (and the other crew) had a EGPWS warning upon turning base or final. Most probably it depends on the altitude at that time and configuration, but I'd say that the EGPWS doesn't realize that we fly QFE obviously
Some kits may not be interested (geometric altitude), some may be confused (QNH baro alt) as you suggest. Be cautious with the advice to ALWAYS use QFE. Sometimes it may not be a technical option. I do not talk about hitting the stops on baro scale (-4/500 @ SOF/EVN) but rather indigenous properties of various aircraft systems (press reg, TCAS-XPDR).