Mxsmanic wrote:
Robert M. Gary writes:

The autopilots that have "pitch control" (terminology used to denote
that it does more than hold altitude, it holds VS) usually have trim
control as well. The familiar "Trim, in motion" annunciator that seems
to go off everytime I click the mic to call tower in the G1000
aircraft.

Doesn't trim make its own noise? I've read notes in voice recorder
transcripts that mention "trim wheel moving at autopilot speed,"
although that is in large aircraft. I assume it must make quite a
noise if this gets recorded.

Its an annunciator just like any other. There is one annunciator that
has multiple preprogrammed channels. I believe mine has 40 different
things it can say, although few are hooked up. A signal goes down the
wire to the annunciator and the voice speaks. Its not part of the
autopilot or trim system itself.
Mine often says "Check landing gear" just as I call up tower when on
approach. Its a bit annoying.

-Robert