Display Source Selector
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.
Control Panel Selector
The CONTROL PANEL select switch determines which EFIS control panel controls the
pilots’ display functions. With the switch positioned to either BOTH ON 1 or BOTH ON 2, the
selected EFIS control panel provides inputs for both sets of pilot displays. When in the
NORMAL position, a “DISPLAYS CONTROL PANEL” annunciation illuminates below the
altitude indication showing a failure of the associated EFIS control panel.
