While rare, there have been reports of a software error bringing down multiple displays simultaneously. My vote is for a completely independent, including software, back-up.
With 2 screens, dual ADAHRS's and back-up power and serial buses, I think the chance of a dual failure is EXTREMELY remote.
With 2 screens, dual ADAHRS's and back-up power and serial buses, I think the chance of a dual failure is EXTREMELY remote.
That's what I thought until I read this:
http://dynonavionics.com/cgi-bin/yabb2/YaBB.pl?num=1445144163
While I wouldn't expect this to happen much, it does happen and I plan to have a backup AI (probably the Dynon D2) at a minimum. I'd hate to be climbing or descending through clouds when the displays decided to reboot!
Does this apply equally to Garmin? Note the above is a Dynon issue.
How about ForeFlight with Stratus 2S as a backup? And, adding a second or third display increases your odds of a failure by 100 or 200%.
Glad to see this topic. I am leaning toward the second g3x once I prove that I can install the one I'm working on now and I like it.
My question and concern re the dual g3x is, for a software upgrade, is it going to instantly be installed on both displays and therefore remove the redundant property? Or will it be possible to install on only one display at a time so that if there is a problem you still have one that should work? I am assuming, like with the dynon example, that an upgrade has a bug that creates a problem.
The uncertified systems we use in experimental airplanes don't go through the rigorous DO-178 software verification process, and we hope they are developed and tested by responsible organizations.
In a more complex system the odds of having SOMETHING fail are greater, but in a properly designed system, your odds of having a failure that affects the safe outcome of the flight are much, much less.And, adding a second or third display increases your odds of a failure by 100 or 200%.