It may take some doing but sometimes you can. I was able to talk the
Sacramento FSDO into approving (in concept) a co-pilot located non TSO
-AI. The agreement was that I would never apply for 135 and that the
instrument would be labeled "VFR only". However, before installation
Sporty's came out with reallly cheap TSO'd AIs so I never did the
install.

-Robert


Dico wrote:
Hello,

I'm wondering if its legal to put a 2nd artificial horizon in the plane
as a backup if it is not certified? We may want to put one in the
plane as a backup... but just wanted to know if we need a certified
unit or not.

Thanks,

-dr