Due to not enough test flights, knowledge of A330-200 limits and rate limitations of flight envelope is not sufficient.
Loss of speeds gets a critical situation to the aircraft's system design, reconing and protections. So the system reversed to Alternate 2B Law.
At this time we find a total lack for man-machine interface in terms of effective aircraft observability.
In that moment the restitution of human's classic hand and high altitude skills is not possible due to bad selected, bad teached, undertrained concierge-pilots. Don't forget their questions have been throwes off since 1/4 century by airlines, national and former european civil aviation autority.
That situation means that UAS is first an unsolved SYSTEM problem (despite inertial system exists on the aircraft which may not be clogged by ice ?) which will get a human UAS unsolvable problem,
Recording more and more parameters in the black boxes would be useless at preventing next SUCH accident.
Engineers and pilots have first to coordinate on the ground to elaborate transfer from process to SOPs.
We do not know the total conversation (due to BEA decision) and why1, why2, why3, why4, why5, and how the crew pulled to stall.
But, as they are not teached to, AF pilots could not invent "unloading the wing" technic, nor imagine computed but not displayed AoA, to replace the airframe shape in the airflow to recover.
1. None of the three simulations reported in the thread, and very well compilated by TurbineD, can get accreditation from test pilots, as simulators have not enough information. So no available SOPs can be written on these simulator experiences basis.
2. Owain G. takes only the half of the problem as stall is not a speed problem but an AoA problem :i.e. a free faller diving at 300 km/h falls without lift, only drag, but may deplace himself forwards with felt , strong lift, 40° pitch ND, falling 200 km/h changing only a little his arms positions and Cg position.
The deepstall is another case were you have speed and not enough lift.
3. On the other side, the "unloading the wing" technic, that Machinbird pulled like a magician from his large fight piloting science, is used in 0g certified Airbus flights to train astronauts. An that technic combined with official performance calculations reported by Hazelnuts39 show that THAT TECHNIC , and only that technic, could have been used with AoA and training, to overcome the stall with relieble new SOP.
In conclusion, developing these two points, further AF447 may be avoided.
