I don't get why people don't understand staggered roll outs....
Here's a scenario:
- Captain A: I see communications have failed. What does your manual say to do?
- Co-pilot B: It says to do ABC.
- A: Hmm. Mine says XYZ is the procedure.
- B: That's peculiar, let's have a long technical discussion.
In this case, checking the EFB on the ground may have been safer than resolving conflicting versions in the air.