Originally Posted by
outofsynch
What difference would that make? Especially during the day...
That's what I'm asking myself yet that is the requirement I believe although you can select DIM for T/O and APP.
The idea is that integrated standy lighting (batt bus) needs to be selected on to read the standby instruments clearly but in the dark the overhead switch is hard to find so the AD directs that the Dome lights (also batt bus) remain on to facilitate finding the switch.
In practice though we're finding that the glare on the displays from the dome lights is distracting, not to mention a little disturbing on approach. (if the illness doesn't cure you the medicine just might?)
There is an airbus fix coming next year to automate the switching of the standby inst. lights but in the meantime we're stuck with the glare.