[flosstop]

> But how can the pilot figure that out, while flying the aircraft?

The standby instruments were working and falling back to them in the event of a primary flight display failure is part of the training

[starspangled]

The article says this

> Despite the investigation finding Del Pizzo followed the proper procedures and was not derelict in his duties,

But you say he did not follow proper procedure. Is the article wrong about that?