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1. 06:33 PM - Trim Control Selection & Indication (Galin Hernandez)
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| Subject: | Trim Control Selection & Indication |
Back in 2012 when I designed my all glass instrument panel, I thought I had
covered every possible situation you could encounter while flying. I was
proven wrong when I did my first flight with my wife. As we flew along she
rested her hand on the co-pilot joystick, and since both joysticks have
trim control, she accidentally changed the way the airplane was trimmed.
Since I fly actual IMC, this was not part of an acceptable design to me. So
I re-wired the trim circuit and installed a trim selector switch. This way
the trim can only be controlled by the pilot flying while the other trim is
inactive. This setup worked to perfection, until last month.
I was flying with a pilot friend who wanted to do some practice approaches.
He flew the airplane for about 1hr then it was my turn to do some
approaches. But no matter how hard I tried I was fighting the airplane and
could not keep it where I wanted. After about 1/2hr I realized the trim
switch was still set to co-pilot so no matter how much I moved the trim,
nothing was happening. As soon as I turned the switch to pilot, I could
properly trim the airplane and everything fell in to place. I realized that
unless I was looking down at the selector switch I couldn=99t tell wh
o had
control of the trim. The last thing I want to do while flying actual IMC is
to be looking down to check the trim selector switch position. Again this
was not part of an acceptable design to me. So I went back to the drawing
board to come up with an acceptable solution. Here is a link to a .pdf file
that details my "solution"
http://puertoricoflyer.com/Files/Trim%20Indicator%20Installation.pdf
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