"xeM" wrote in message
...
Can an AP/IA person legally install and sign off a VFR Nav/Comm radio
in a certified aircraft, given that he has all the needed technical
knowledge needed to do this, or is a 'certified radio shop' required
somewhere in the paperwork process?

A&P/IA is all you need.

How about an IFR installation?

An IFR GPS requires a radio shop.