So, one thing I've never done is a test on the Service Ceiling on my RV-10. No real practical reason to do it. I'm just curious so it would just be for grins and giggles (yes I know I'll need O2). My question is from an ATC perspective, how to go about filing and/or asking ATC for a clearance to say FL 200 since theoretically the test would take me into Class A airspace and therefore IFR. I'm based under a Class B shelf so initially I'd be a talking to Approach but I would expect that at some point I'd have to be handed off to Center (not sure the vertical airspace structure in that regard). I don't really want to go anywhere particular for the test--I envision just doing racetracks over our practice area which is out of the way of airways and direct city routings and wouldn't interfere with any flight level traffic, as far as I can tell. Thoughts?