With ED2 failure or automatic transfer from ED1, what happens to the EICAS Control Panel?

• A. ECP remains fully functional.
• B. ECP enters standby mode.
• C. ECP defaults to limited pages.
• D. ECP operation is inhibited and the status and synoptic pages are removed. It can be regained by using the MFD reversionary panel or the source selector panel.

Answer: (D)

When ED2 is unavailable or when control has automatically shifted from ED1, the EICAS Control Panel is inhibited. This stops you from using the ECP to select or view EICAS pages, and the status and synoptic pages are removed from the EICAS display. The design keeps you from interacting with a data source that’s no longer the active one, avoiding inconsistent information.

To bring control back, you use the MFD reversionary panel or the source selector panel to re-route EICAS data and re-display the status and synoptic pages. This reinstates access to the essential engine and system information once the display routing is reset.