"You can go completely off the HSI localiser scale -yet the expanded localiser on the ADI will still stay expanded and all you know is that you are currently more than just one dot off centre. "
Is your F/O also situationally unaware?
Is this typical display behaviour? Do most glass cockpit aircraft types latch the MAP displays in the expanded mode, or do the displays go back to normal if you go out of range of the expanded display? (say, 1.25 dots)
I know there are a few differences when it comes to this sort of thing. As far as I know, the 747-400, for example, only produces an expanded display when the LOC is engaged (so there will be less chance of you going off the ILS beam, once established thereon).
Regards.
Q.