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symbology may differ.
HUD Components
Overhead Unit (OHU)
The OHUs are located above the head of each pilot. The OHU contains an LCD
projector and the optics necessary to display flight data symbology onto the
combiner glass.
The HUD projector is monochromatic (green), so all information displayed on the
HUD combiner is green.
HUD Controls
Symbology and brightness controls are the only dedicated HUD controls.
Manipulation of the FMS, EFIS, and MCP controls determine data output on both
the HUD and PFD.
Symbology Control Switch
Symbology control switches located on the outboard side of each control wheel
allow the pilot to alternate between the two display modes. The switches control
the respective pilot’s side only.
Brightness Control
The brightness control has two modes; manual (MAN) and automatic (AUTO).
The MAN mode is selected by pulling the brightness control knob outward.
Display brightness is then adjusted by rotating the control left or right as desired.
In the AUTO position, a light sensor will detect the amount of ambient light and
automatically adjust the brightness level to maintain a constant display contrast.
787 Flight Crew Operations Manual
Flight Instruments, Displays -
Head-Up Display System
Description
10.22.2 Boeing Proprietary
Combiner
Glass combiner screens are attached above the forward windscreen on a rotating
dual arm assembly. Combiner deployment is accomplished by pushing down, then
forward on the combiner assembly until it reaches a physical stop. A locking
mechanism is used to secure the combiner in the stowed position.
A HUD ALIGN alerting message will display on the combiner screen if it is not
properly aligned with the projector. Ensuring the combiner is positioned at the
stop removes the message.
The HUD system does not have an ON-OFF switch. The projector turns on by
deploying the combiner, and turns off by stowing the combiner.
If there is a sudden and sustained deceleration, the combiner will rotate forward
and lock in a breakaway position. This is to prevent the pilot’s head from
impacting the combiner. To release the combiner, push forward to relieve pressure
on the latch. Then slide the locking lever to the right, releasing the combiner. Then
reposition the combiner to the desired position.
Combiner Display Symbology
The data format and symbology displayed on the HUD closely replicates 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 symbology and
de-cluttered. 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. An exhaustive list
comparing the PFD with the two HUD display modes is located at the end of this
section.
Due to the monochromatic limitation of the HUD display, many alerting functions
that use color (usually amber) symbology on the PFD may use only flashing
symbology on the HUD, or have no distinct HUD alert.
HUD-Unique Symbology
The HUD has some unique symbology not found on the PFD. This section details
those symbols and their function.
787 Flight Crew Operations Manual
Flight Instruments, Displays -
Head-Up Display System
Description
Boeing Proprietary 10.22.3
Pitch Scale Compression and Chevrons
The HUD pitch scale normally displays 5 degree lined increments above and
below the horizon reference line, and conform with the outside world. For
example, as the pilot looks through the HUD, the horizon reference line on the
HUD pitch scale should rest at or near the actual horizon outside the airplane. (At
higher altitudes, the HUD horizon reference line may appear slightly above the
actual horizon due to curvature of the earth).
If the HUD horizon reference line or the flight path symbol cannot be shown on
the display when it conforms with the outside world (excessive pitch up or pitch
down), the pitch scale will compress to make room for these symbols. The pitch
scale then displays 10 degree increments.
When the pitch scale is compressed, chevrons appear directing the pilot to pitch
the airplane back toward the horizon. For example, if the airplane pitch angle is
excessively high, a downward pointing chevron superimposed on the +30 degree
　
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