787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Flight Instruments, Displays -
Head-Up Display System
Description
Copyright © The Boeing Company. See title page for details.
10.22.2 D615Z003-TBC
Combiner
Glass combiner screens are attached above the forward windscreen on a rotating
dual arm assembly. Combiner release is accomplished by sliding the locking lever
to the right. Push the combiner assembly down and forward allowing the assembly
to snap into position from spring tension. A locking mechanism is used to secure
the combiner in the stowed position. Stow the combiner by lifting the combiner up
and back until the latch engages in the locked position.
An ALIGN HUD alerting message displays on the combiner screen if it is not
properly aligned with the projector. Ensuring the combiner is positioned at the
stop removes the message.
If there is a sudden and sustained deceleration, the combiner rotates forward and
lock in a breakaway position. This prevents the pilot’s head from impacting the
combiner. Release the combiner by pushing forward to relieve pressure on the
latch and slide the locking lever to the right. Then reposition the combiner to the
desired position.
Combiner Display Symbology
The data format and symbology displayed on the HUD closely resembles the
symbology on the PFD, though some differences do exist.
One of the major differences between the HUD and PFD is that the HUD is
capable of displaying two alternate symbology modes: full and decluttered. The
full-symbology mode shares many common elements with the PFD. These
include speed and altitude tapes, lateral and vertical navigation performance
scales, bank angle indicator, and flight mode annunciations (FMA). A partial
compass rose is also at the bottom of the full-symbology HUD display. The
decluttered mode eliminates airspeed and altitude tapes, displaying only digital
values. The partial compass rose is also removed.
Due to the monochromatic limitation of the HUD display, many alerting functions
that use color (usually amber) symbology on the PFD may use flashing, shape
filling/blanking and highlight box symbology on the HUD, or have no distinct
HUD alert.
HUD-Unique Indications and Symbology
The HUD has some unique symbology not found on the PFD. This section details
those symbols and their function.
February 15, 2010
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