ADR Switching
ADR Switching:
From my experience, I've noticed the information isn't presented instantaneously but rather 'scrolls' to the particular value.
At least this is what I've noticed with normal working ADRs, when using the ADR switch on the 320 family.
Now for their situation, having the AIR DATA switch placed to 'CAPT on 3' after the captain entered the cockpit, would revert the PF's altimetry information back to ADR2 - which, if in the (highly unlikely but possible?) event that one or both the F/O Static Ports were blocked - I imagine would start 'scrolling' UP indicating a climb (to the original altitude at the time of blockage). This of course would be highly confusing, especially coupled with the lack of V/S information on the PF side, and would certainly hinder their progress in recovering the situation.
(Once again - we do not have the ADIRU 2 information as it is not recorded by the FDR. Unfortunately I think that information would be the key to understanding the PF's actions).
Anyone have more experience with this ADR switching 'scrolling' aspect?