Definitely outside my experience. As I recall, we could push the trim switch
fore and aft to run the trim motor, and push down on it to disengage the
autopilot.

Looking at your picture, I was thinking back to the days when pilots had no
way to exchange experiences at all...now we can send pictures to illustrate
points.

Bob

"tjd" wrote in message
ups.com...
On Sep 28, 7:52 pm, "Bob Gardner" wrote:
My memory isn't what it used to be, and though I flew a lot of planes
with
trim switches I don't remember there being two. I must have a "two
separate
actions" thing going on in my thinking machine.

In the G1000 172SP I flew, the natural thing is for your thumb to move
both switches simultaneously; moving them individually (during
preflight) takes conscious effort. Kind of like a split master
switch, it's much easier to turn both sides on than either one by
itself. You can see the arrangement pretty well in this pictu

http://www.aeroclub-tsl.gr/files/depanel.jpg

Like I said, I'm not sure how often a stuck switch is the cause of
runaway trim but this design all but eliminates that possibility at
very little cost. Of course it's almost twice as likely for a switch
to fail open and leave you with no electric trim, but I'd much rather
have that happen than having the trim run away and having to fight it
or pull a breaker at an inopportune moment.

todd.