Yeah,
In the airbus special ops, the pictorial descent profile explains as such aircraft must be at or below FL 180 within t +5 mins, and may maintain this level (max) until t +12 (oxy depletes at t + 12++) then descent to FL 140.
why the initial descent must be at or below FL 180 not higher ?
will there be any complication if maintain higher (eg: human factor, oxy on demand).
If no, can I safely say aircraft may maintain as high as possible as long as at the end of t +12 (oxy deplete) aircraft must be at FL 140?
