So a guy who may not have exercised either license for maybe 20 years is expected to just remember it? Or apply what he reckons it is? Sounds pretty rubbery to me. If you are being certified by CASA, to what standard are they certifying to? Purely the fact that you once held a license? You could have worked in admin your entire career? Not every FSO held an AFIZ (AFIS) rating . That was something you did additional training for. I'd be pretty sure those Airservices guys in PHD aren't just winging it (I know they are not doing CA/GRS, but the end result is the same).