Hi,
PJ2,
The airplane was fine moments before the loss of airspeed indication
Actually before encountering ice crystal the A/C was working fine, i agree.
After increase of CVR noise and fit with OBSOLETE FR probes we may say she was no longer fine.
The clogging started and eventually affected the Stability of the System.
The bureaucracy (and other factors) was allowing the operation of hundreds of flights with obsolete sensors.
And the pilots being instructed to use "State of the art" band aids. *
I would prefer "State of the art" Systems.
PS
With insufficient crew training (lack of) for the worst case scenario.
(*) I like duct tape, swiss army knife, band aid, and all this emergency stuff.
But i love a good design. When possible, why not to have it?