From the BEA preliminary report N°3
Concerning Airbus plane .. it's what I find ...
3 - CONCLUSIONS
3.1 New Findings
° There was an inconsistency between the speeds measured, likely following the blockage of the Pitot probes in an ice crystal environment,
° The airplane’s angle of attack is not directly displayed to the pilots
° By design, when the measured speed values are lower than 60 kt, the 3 angle of attack values become invalid
° The engines functioned normally and always responded to the crew’s inputs
4 - SAFETY RECOMMENDATIONS
Angle of Attack Measurement
° The crew never formally identified the stall situation. Information on angle of attack is not
directly accessible to pilots. The angle of attack in cruise is close to the stall warning trigger
angle of attack in a law other than normal law. Under these conditions, manual handling can
bring the airplane to high angles of attack such as those encountered during the event. It is
essential in order to ensure flight safety to reduce the angle of attack when a stall is
imminent. Only a direct readout of the angle of attack could enable crews to rapidly identify
the aerodynamic situation of the airplane and take the actions that may be required.
Consequently, the BEA recommends:
that EASA and the FAA evaluate the relevance of requiring the presence of an
angle of attack indicator directly accessible to pilots on board airplanes.
My conclusions
Nothing wrong with the Airbus plane
Only one remark about angle of attack not displayed to the pilot ( not special .. as many modern airliners don't have this indication)
Special:
No recommendations (any) about the pitot tubes (nothing to change in the certification .. etc ..) or any recommendation to avoid to fly out of the certification range of pitot tubes
Note that all the chain of AF447 event begin cause the pitot tubes where not able to function correctly during a gap of time due to their usage out of the certification range
So the BEA accepts this situation and therefore also agrees that this event happens again with the risks that entails