Dual vs. Single EFIS

[rleffler]

Originally Posted by iamtheari

I guess I should have asked for single, dual, or triple... Another thing I am still rolling around in my head is whether to have a backup flight instrument. For example, the Garmin G5 works as a display if the G3X system goes down, and it can also act as a backup ADAHRS for the G3X displays if the main ADAHRS goes down. So the secondary poll here is whether to burn panel real estate on a backup instrument or to have a dual-screen EFIS with dual ADAHRS. A guy can have too many backups at some point.

Two EFIS in IMC provides some redundancy, but if one adahrs goes bad, which one is correct. That?s why you need a third device for tie breaker. The G5 serves the tie breaker role very well.

I personally find having a PFD and MFD in front of me, as well as another email 3? EFIS as a tie breaker advantageous. Especially if you want to view charts and plates at the same time.

[maniago]

I'm in the camp that Bob mentioned above (my panel pic is posted earlier in this thread). I have dual adahars, but wanted a steam horizon to break any tie. When I went to look at new and used ones, the price was a killer so I went with a GRT minix for less - internal GPS, internal adahars, internal BU battery, backup AP, BU engine gauges HSI etc etc in a 3" space - not as small as the G5, but more features. In reality I dont need any of the steam gauges now since those are all on the Mini, but ah well, build the plane you want, not what others say you should....