We had our transponder require some work and the A & P added a placard
as "transponder inop" until we got it back. As long as you stay clear of
B & C you should be OK.

I'm curious as to why you wouldn't just have the inspection done? I
don't think it is that expensive to do. We ended up buying a
remanufactured unit for about $400. So the battery in yours has lasted
10 years or is it dead?

Jon Kraus
'79 Mooney 201
4443H @ TYQ

Matt wrote:
Looking over my 152's logs, it appears the transponder has not been
inspected since the altitude encoder was installed, about 10 years ago. Is
it legal (not necessarily smart) to pull the circuit breaker, placard the
transponder as inoperative, and continue to fly until I get it inspected at
the next annual? I would be staying clear of class B and C.

FYI, the mode C is working fine.

Thanks for all comments.

Matt