In EFIS, in case of failure in the PFD, where would be PFD shown? In case of failure in the ND, where it would be shown? In case the PFD & ND both fail, where would they be shown?

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  • $\begingroup$ The pilot and copilot PFD's are separate systems, if the pilots PFD fails, the copilot PFD should still be operational. The screens can be switched on either side but if they both failed for some reason the pilot with working displays will probably assume control. $\endgroup$
    – Ron Beyer
    Commented Jan 15, 2017 at 16:04
  • $\begingroup$ Are you asking about failure of the display itself? $\endgroup$
    – TomMcW
    Commented Jan 15, 2017 at 16:30
  • $\begingroup$ Yes, I am asking about in case of one or two of these displays fail what is the situation ?! $\endgroup$
    – Al Yaqdhan
    Commented Jan 15, 2017 at 17:52
  • $\begingroup$ I've seen document on captainpilot.com, which described this for A320 too, but the site is down. $\endgroup$
    – Jan Hudec
    Commented Jul 7, 2017 at 20:57

1 Answer 1


On the Embraer 170/190-series, the normal display layout is as follows:

enter image description here

There is an automatic display reversion logic when one or more panels fail. The following image shows this logic: enter image description here

There is also a manual reversion switch located near each pilot's outboard knee, which controls what is displayed on the panel:

![enter image description here

All images sourced from an Embraer Airplane Operations Manual.

  • $\begingroup$ What will the MFD contains in case of failure ? and can you label the priority of the displays from the Most significant until the Less significant displays ? $\endgroup$
    – Al Yaqdhan
    Commented Jan 15, 2017 at 17:43
  • 2
    $\begingroup$ A failed display will be blank. As you can see by the system logic that the PFD is given the highest priority, then the EICAS, and finally the MFD. $\endgroup$ Commented Jan 15, 2017 at 18:18

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