ATC enroute sector validations
A question if I may to answer the curious cat that resides in me.
I know controllers have to validate for each sector they work but I'm also aware that at night a controller will have more than one sector to look after.
I noticed that Reims published a notam stating that at night all of their sectors would be controlled via a single radio frequency. In other ATCC's up to four or more sectors can be bandboxed together.
Does that mean that the controller would have to be fully qualified for every single sector or does the night time role hold another form of validation because of the different workload encountered?
Thanks clicker