On Tue, 18 Oct 2005 08:37:43 -0700, wrote:

My take is that once a transponder acts up like that, it's time to have it
bench checked. With a light aircraft panel mount, the owner could certainly
remove the unit and take it to the avionics shop.

Doesn't removing the transponder from the tray disconnect it from the
static system and thus require a re certification under 91.411(2)
before it can be used IFR in controlled airspace?