@ Cleared to cross
Why mention the Standby AH? From the swathes of pages about this very distressing accident, I don't see any reference to the MAIN Attitude Indicator on the PFD(s) being U/S ...
ATTITUDE, surely, was the clue they missed - but why? The aircraft seems to have been in trim and flying normally, but perhaps with a bit of turbulence ... I won't go on, but this over-insistence on the Airspeed indications makes me feel that contributors to this (and "the other") forum are making a similar error.
As a long-retired military pilot, I once flew what were then known as "medium range twin-jets" for some years in the ITCZ and had the odd encounter at night with an unsuspected cumulo-bumbulo, so I feel a great deal of sympathy for the two pilots at the controls of 447 that night. My point is really that the thread(s) aren't dealing with the main issue. Aeroplanes aren't like cars, with "just" a speedometer on the dashboard, and you "drive" them differently.