Originally Posted by
B888
This procedure was used by my outfit when we operated Airbus and worked well. However one pitfall ( and this happened on a flight ) is the setting of QNH and forgetting to switch back to STD.
This crew ( PF ) set the QNH but forgot to switch back to STD and was cleared descent to a Flight Level. A Level bust occurred using QNH instead of STD.
We do that at my outfit. We’ll set the QNH while doing the perf app page, about an hour out. What you described shouldn’t happen in an Airbus, as I believe it’ll eventually start flashing at you.
Some people set the destination QNH when climbing through TA on the sid.
Both methods are only technique though.