With a failure of the ECAM UPPER or LOWER DU, the SD can be viewed on one of the NDs by ____________.

With a failure of the ECAM UPPER or LOWER DU, the SD can be viewed on one of the NDs by ____________.

• A. pressing the E/WD button on the ECAM panel
• B. movement of the ECAM/ND XFR switch
• C. rebooting the ECAM system
• D. pressing the SD button on the ND panel

Answer: (B)

When ECAM information needs to be kept available despite a failed ECAM display unit, the system lets you route ECAM data to one of the navigation displays. The ECAM/ND transfer switch is used to shift the ECAM pages from the failed ECAM DUs to an ND, so the System Display can be shown on the ND. This lets you view the ECAM SD (System Display) pages on the ND even with an upper or lower ECAM DU failure, keeping access to critical system information. The other options don’t provide the required transfer path: the E/WD button selects engine/warning content on ECAM, not display routing to the ND; rebooting won’t restore a failed DU; and pressing the SD button on the ND panel isn’t the standard method to route ECAM data when a DU has failed.

When ECAM information needs to be kept available despite a failed ECAM display unit, the system lets you route ECAM data to one of the navigation displays. The ECAM/ND transfer switch is used to shift the ECAM pages from the failed ECAM DUs to an ND, so the System Display can be shown on the ND. This lets you view the ECAM SD (System Display) pages on the ND even with an upper or lower ECAM DU failure, keeping access to critical system information.

The other options don’t provide the required transfer path: the E/WD button selects engine/warning content on ECAM, not display routing to the ND; rebooting won’t restore a failed DU; and pressing the SD button on the ND panel isn’t the standard method to route ECAM data when a DU has failed.