Originally Posted by
vilas
If you are higher than final descent altitude the final descent arrow will not be in blue colour. And FINAL APP will not engage.
If you are higher than final descent point the final descent arrow may not turn blue. And final approach may not engage if final approach criteria are not met IAW FCOM DSC-22_30-80-30-20.
This statement is not necessarily true if we're higher than the final descent altitude.
This in the reason why airbus recommends to arm FINAL APP mode when the TO waypoint is the final descent point. Ref: FCTM
PR NP SOP 120 GUI Approach using final approach guidance.