| DISPLAYS Source PanelDuring normal operation, with the display SOURCE Selector
Switch in the AUTO position, DEU1 supplies data to the Captain outboard, Captain inboard
and upper DUs while DEU2 supplies data to the First Officer outboard, First Officer
inboard and lower DUs. If a DEU fails, the remaining DEU automatically supplies data to
all six displays. A single DEU failure will continue to supply each pilot with flight
instrument information from independent sources. Each DEU receives data from both ADIRUs.
The display SOURCE Selector, used on the ground for maintenance purposes, allows manual selection of either DEU1 or DEU2 for all six display units. If the displays are automatically or manually switched to a single DEU source, a "DSPLY SOURCE" annunciation illuminates on both pilot's primary flight display.
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