Avionics Wiring Harness: A Tutorial

[tdldedcd]

Eric, thanks for all the posts you have done in regards to wiring. It has been extremely helpful to myself and many others. I have another one for you. I have 2 Ray Allen control sticks with trims switches. I need to bring them together with the panel mounted trim switch and then back to the GA28. What is the best way to bring these wires together? Do I need to utilize a mixer?

Thanks again for all your help.

[Eric Page]

I have 2 Ray Allen control sticks with trims switches. I need to bring them together with the panel mounted trim switch and then back to the GA28. What is the best way to bring these wires together? Do I need to utilize a mixer?

I presume you mean GSA28, Garmin's autopilot servo. The GA28 appears to be a marine GPS antenna...

Just to clarify, are we talking about flaperon trim via the GSA28 servo, or elevator trim via the Kitfox-supplied DC linear actuator?

If you mean elevator trim, then how/why is the GSA28 servo involved?

Set me straight on those questions and I'm sure we can get your trim sorted out!

[Eric Page]

OK, after sleeping on this, I've decided that I might be misunderstanding the way Garmin handles trim.

Does the Garmin autopilot accomplish pitch trim using only the elevator servo (i.e. no control of the Kitfox stabilizer actuator)?

Or, does the Garmin pitch servo do two things: 1. control the elevator; and, 2. pass trim commands to the stabilizer actuator from either the instrument panel control head or the trim switches?

I guess I'm just thoroughly confused!

What I really need to know is, where are the signals from your trim switches going, and does the receiver want to see 12V or ground from the switches to command the trim motor to run?

Also, what are the current limits of whatever Garmin device is directly driving the Kitfox actuator?