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-   -   Garmin G3X ahars hard failure (https://vansairforce.net/community/showthread.php?t=146943)

guims 04-06-2017 01:35 AM

Walt, what is you meaning regarding first time posters?

My RV was professionally built and we took delivery in Nov 2014. I have about 80 hours on it and the plane has flow 350hours. The external GPs is the 650.
It has been flawless up until now.

Steve at Garmin has been extremely helpful and the builders have gone through the avionics. We did a software update. We also had a GPS reception problem at the same time, so have now installed a 3rd GPS antenna.

Auburntsts 04-06-2017 05:40 AM

Quote:

Originally Posted by Walt (Post 1158839)
Second, in a properly installed system with dual screens and dual ADAHRS (each screen has a built n GPS receiver and back up data lines to each ADAHRS) the chances of this happening to both systems simultaneously seems almost impossible unless perhaps you got hit by an EMP pulse!

I'm seriously thinking about adding a second ADHRS to my G3X system. I have the older GSU 73 and flying this past weekend in some pretty sporty turbulence, I lost my attitude indication (no red X but it went into alignment mode which it couldn't complete due to the turbulence) for most of a 50 min flight (I was creeping along at Va). Now I was VFR and I still had air data and magnetometer (so partial panel plus I have a standalone backup PFD), but I still wasn't happy and had I been in IMC less happier still.

dspender 04-06-2017 06:49 AM

Sure its a hardware issue and not remedial with a software update?

Bill.Peyton 04-06-2017 03:46 PM

It sounds like the GSU73 may be mounted on a surface that has too much flex and vibration. I have both a GSU73 and GSU25 and have never seen a hardware failure in 650+ hours. I do suggest dual ahars if using your aircraft in IMC.

MK77 04-06-2017 04:12 PM

Intermittent OAT
 
I had a GSU25 issue where the OAT was intermittent. It would show up some days and other days it would have a big red X through it. Seemed highly unlikely to be a problem with the system so I checked my wiring numerous times. I measured the proper resistance values across the pins every time. I consulted with Garmin and although they were also skeptical at first (I don't blame them, I'm sure 95% of the time it IS a builder / wiring issue) they eventually sent me a replacement through Steinair and the issue went away. OAT comes up every time I switch on the system now! I was very happy with Team X help to troubleshoot the issue and the resolution of sending out a new GSU25 which solved the problem.


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