737 Flight Crew Operations Manual
Flight Instruments, Displays -
PFD/ND – System Description
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D6-27370-866-EGP 10.21.3
EFIS Control Panels
Two EFIS control panels, located on the glare shield of the center main panel,
control display options, mode, and range for the related pilot’s displays.
If one EFIS control panel fails, the displays can be controlled by the remaining
control panel. Refer to the PFD and ND sections of this chapter for more
information.
Display Select Panel
The display select panel, located on the left and right forward panels, controls the
displays on the inboard, outboard and lower DUs. Normal operation is all selectors
in the NORMAL position. The pilots’ outboard and inboard DUs display primary
flight and navigation data and the upper DU displays primary engine data and fuel
quantity.
If a DU fails, automatic display switching ensures critical information remains
available to the pilots at all times. If the system detects an operational failure on
an outboard DU, the primary flight display automatically moves to the inboard
DU and the failed outboard DU blanks. The OUTBD/INDB selector no longer has
control over that display unit. If the upper DU fails, the engine display
automatically moves to the lower DU.
Manual control of display formats is provided for undetected failures. The
outboard rotary switch on the display select panel controls the formats displayed
on either the outboard or inboard DUs. The inboard rotary switch controls the
display format shown on the lower DU.
September 25, 2009
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