Originally Posted by
fatboy
since you are talking about mode c transponders i also have a question. if your mode c transponder fails enroute to a class b or c airport are you still allowed to enter even if your equipment fails?
Yes... ATC can authorize flight without a working transponder. If it failed in-flight I'm sure they would do it right then. Otherwise, you can call up the approach control and get phone authorization to do it. They will track you on radar as a primary target and have you report your altitude.