Procedures when adjacent control unit failed
I have a question, if you are the approach controller, suddenly approach radar failued, you can't do any operation on it, and if ACC take over the approach control, it is not that practical, because ACC controllers know little about approach. So does the same to the approach controllers when ACC radar failure.
So my question is if you have some related regulation or rules about this?
I was told that there is a kind of space called "radar advisory service airspace" (I do not know if this translation is correct) in USA, can somebody give me some detail about this kind of airspace?
Many thanks