"PaulaJay1" wrote in message ...

A single 430 should not be used with the Idea that a VOR will always be
available if the GPS goes south. I had the display in my 430 fail which made
the COMPLETE unit inop.( unless you knew where the com was and could count the
clicks :-) )

That redundancy concern is different from the legal issues. It's perfectly legal
to fly (subject to the ground facilities needed) with a single NAVCOM. It can
just as easily go TU leaving you with no nav or com.

The regulations just say that if you are going to use GPS that your alternate requirements
have to be met without using GPS. They're figuring satellite geometry failure (GPS system)
not the reliablity of the box installed.