We hear a lot of things about the reasons who led the pilots to disconnect 2 ADR :
1) that the aircraft was AOA indicators equipped and it is one of its related emergency procedures who led them to think about that ; or
2) that it's rather the "Unreliable Airspeed" procedure who...
No EVA source however:
From another topic about the subject, it was said they switched off all 3 ADR i.s.o. 2, if equipped with 'BUSS' that will display the BackUp SpeedScale and AoA pointer.
if they re-select any or all ADR it will revert to the 'normal' speed display while alternate law (without AoA protection) remains.
In a
reaction Thales submitted the aircraft involved was not Thales AoA vanes equipped and they where not responsible for the
conical plate.
So Goodrich 0816ED vanes must have been installed....
Conical plates are physically different (Thales has flat circular cutout while Goodrich has a countersunk and lemon shaped cutout).....
Did they fitted 'thales' plates on goodrich vanes? conical plate on top of original flat plate?