SWITCHING Panel

Question 1

What computers feed data to the six display units?

Answer 1

• Three Display Management Computers (DMC)

Question 2

What do each of the DMCs normally supply?

Answer 2

• DMC 1 – Captain PFD, Captain ND, “Upper” ECAM DU (E/WD), and “Lower” ECAM DU (SD)• DMC 2 – First Officer PFD, First Officer ND• DMC 3 – Backup

Question 3

If there are any automatic functions of the DMCs in the event of a failure, explain the automatic logic.

Answer 3

• If DMC 1 fails (or DMC3 if “CAPT 3” was selected), DMC 2 automatically drives the ECAM.

Question 4

What are the indications on the DUs if a DMC has failed?

Answer 4

• “INVALID DATA” will be displayed in the respective EFIS/ECAM display unit.

Question 5

What happens when the upper ECAM display fails?

Answer 5

• The E/WD automatically replaces the SD on the lower ECAM display.

Question 6

If both the E/WD and SD display units fail, how can the E/WD information be displayed?

Answer 6

• By selecting the ECAM/ND XFR switch to CAPT or F/O