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While I haven't had a trim runaway due to a stuck button, I have had a trim
runaway due to an inexperienced co-pilot putting their thumb on top of the
MAC grip. I have relays configured to give the pilot's trim control
authority over the co-pilot's control. I also have the trim breaker front
and center, away from the other breakers, clustered with the trim
indicators, just above the engine controls.

The one thing I wish I had done different is to put remote auxiliary trim
switches that get their power from a different source than the trim breaker
(or trim master). Since I used high quality hermetically sealed relays, the
most likely failure would be a stuck trim button. Since you are not going to
notice and react to a runaway trim until a significant amount of "bad" trim
is applied, it would be nice to be able to re-center the trim using the
remote buttons.

A hard over failure due to a malfunction in the motor is unlikely if not
impossible. The motor will fail dead.

Regards
Brent Regan

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Please send your photos and drawings to marvkaye@olsusa.com.
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