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RAC makes a stick grip
with four trim buttons built into the top of it. One of our customers had
one that allowed the nose down button to get stuck underneath the upper housing
if it was pressed any way but exactly straight down. RAC was very
interested in getting it back and replaced it no questions
asked.
Dave Saylor
AirCrafters LLC
140 Aviation Way
Watsonville, CA
831-722-9141
831-750-0284 CL
www.AirCraftersLLC.com
Hi Robert,
My understanding from talking with the RAC guys, who make the trim
components I installed in my Legacy, is that stuck (runaway) trim is
unlikely. (Actually, they said it was impossible, but I find it hard to
use that word.)
The trim servo must receive power to operate. A runaway can only
occur if either the trim switch or the trim relay is stuck in the "on"
position. If that happens, moving the trim switch to the opposite position
should almost certainly cause the switch or relay to open, clearing the
problem. (Wiring faults could also cause runaway trim, but I was careful
to protect the wiring when I installed it and therefore do not consider
this cause to be a realistic possibility during the time I own my
Legacy.)
I've given this some thought and have decided that runaway trim is
possible, but unlikely. I've decided that the additional parts count and
complexity to reduce the chance of an already unlikely runaway
trim isn't justified. I've practiced this and believe I can control
the airplane with full trim if I slow it down, although my arm would get
tired after a while.
Best,
Dennis Johnson
Legacy, 140 hours
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