With a failure of the ECAM LOWER DU, the SD can be temporarily viewed on the UPPER DU by ________.

With a failure of the ECAM LOWER DU, the SD can be temporarily viewed on the UPPER DU by ________.

• A. pressing and holding the desired SD button on the ECAM control panel
• B. moving the ECAM/ND XFR switch
• C. pressing the ECAM SD selector and then releasing
• D. pressing and holding the desired SD button on the ECAM control panel

Answer: (D)

When an ECAM lower display unit fails, you can still keep an eye on important system information by temporarily mirroring the System Display (SD) page on the upper display unit. This is done by pressing and holding the SD pushbutton for the system you want to view on the ECAM control panel. While you hold it, that SD page is shown on the upper DU, giving you real-time access to the selected system without the lower DU functioning. Releasing the button returns the upper DU to its normal content, so it’s a temporary view designed for rapid access during a DU failure. Other actions, like transferring the entire ECAM view with a switch or briefly pressing and releasing the selector, don’t provide the same persistent mirror on the upper DU.

When an ECAM lower display unit fails, you can still keep an eye on important system information by temporarily mirroring the System Display (SD) page on the upper display unit. This is done by pressing and holding the SD pushbutton for the system you want to view on the ECAM control panel. While you hold it, that SD page is shown on the upper DU, giving you real-time access to the selected system without the lower DU functioning. Releasing the button returns the upper DU to its normal content, so it’s a temporary view designed for rapid access during a DU failure. Other actions, like transferring the entire ECAM view with a switch or briefly pressing and releasing the selector, don’t provide the same persistent mirror on the upper DU.