A checkride is one thing, training a student is another, though I have heard of instructors signing a student off to solo their single seater, after the student had soloed the 2 place plane he was receiving dual in. I'm more interested in a BFR... a friend got his BFR in a single seat Quicksilver GT400, though some people questioned the legality, and I'll be interested in doing the same thing in my plane in a couple of years to avoid paying the rental fee for a 2 seater.

Dana