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Old 02-09-2021, 06:46 AM
Larry DeCamp's Avatar
Larry DeCamp Larry DeCamp is offline
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 1,069
Default Garmin G3x / GSA 28 servo question?

I am installing the ID strap jumpers in the servo Dsub connectors. Garmin says pin 8 is a ground and can be used for both jumpers in the PITCH servo. Just double checking, is this correct ?

Also, I am a newbie to GLASS. If I install these IDstraps now, can I just learn to use the autopilot on G3x TOUCH without having to fight the flight director ? My initial objective is wings level and course tracking. Will the trim function work with Garmin servos only, no third party ie. Ray Allen etc.

I appreciate your patience and advice.
Larry DeCamp
RV-3B flying w/7:1 0320 / carb / Pmags / Catto 3b / digital steam
RV-4 fastback w/ Superior roller 360/AFP/G3X/CPI/Catto3b
Clinton, IN
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Old 02-09-2021, 07:31 AM
BillL BillL is offline
Join Date: Sep 2007
Location: Central IL
Posts: 5,828
Default Definitely electric (auto) trim with new AP's

Originally Posted by dwollen89 View Post
Thanks for the info everyone! Definitely will be getting electric trim. I read the complete thread on the gentleman with the runaway trim on his Rv8. The replies helped to put my mind at ease. I've never had electric trim, but it sounds like it'll be nice to have with the AP.
Good Decision. My early generation G3X panel with AP does not have auto trim, and my 10Friend does. It is really nice. I sometimes notice a jitter in the AP roll servo, a tiny little action but found it was due needing roll trim. I don't have servo roll torque feedback, so have to disconnect AP adjust and reconnect. IMC flight makes that a few extra steps.

You will truly love this once tuned.

Lord Kelvin:
ďI often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.Ē
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Old 02-09-2021, 08:42 AM
Tankerpilot75's Avatar
Tankerpilot75 Tankerpilot75 is offline
Join Date: Jan 2015
Location: Oklahoma City, OK
Posts: 613

I have the TruTrak 385 A/P and was recently given an unused auto trim module by a friend who installed his A/P onto a manually trimmed RV. Had Steinair build a plug and play wiring harness and as soon as it turns warm plan to install it in my airplane.

Really looking forward to the day that I donít interpret which way the autopilot is telling me to trim the airplane to keep it from bucking as I change airspeed and configuration.
Jim Harris, ATP, T38, EC/KC-135A/E/R, 2008 RV7A, 2nd owner, N523RM (2015)
Superior XPIO-360, Hartzel CS prop, Dual GRT Horizon WS, EIS, Garmin 340, 335 w/WAAS gps, Dual 430s (non-WAAS), TruTrak 385 A/P with auto-level & auto-trim, Tosten 6 button Military Grips, FlightBox wired to WS, Dynon D10A w/battery backup, 406 MHz ELT. Custom Interior, New TS Flightline hoses, Great POH!
Retired - Living the dream - going broke!
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Old 02-09-2021, 12:16 PM
BobTurner BobTurner is offline
Join Date: Dec 2011
Location: Livermore, CA
Posts: 7,292

Originally Posted by Larry DeCamp View Post
Will the trim function work with Garmin servos only, no third party ie. Ray Allen etc.

I appreciate your patience and advice.
The servo acts directly on the elevator; the trim motor on the trim tab. The Ďautotrimí sends electrical power to the trim motor, whether itís made by Ray Allen or anyone.
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