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pitch scale line comes into view, directing a pitch-down command to the pilot.
Likewise, if the airplane pitch angle is excessively low, an upward pointing
chevron superimposed on the -20 degree pitch scale line comes into view,
directing a pitch-up command to the pilot.
Unusual Attitude (UA)
The UA symbology displays when airplane pitch angle exceeds -20 or +35
degrees, or if roll exceeds 55 degrees in either direction. Only symbology
necessary to help recover from the situation is displayed. This unique display will
replace the normal full or decluttered display modes if previously displayed. This
display will also replace a pitch scale compression and chevron display that may
have preceded it.
The UA symbology remains displayed until the airplane pitch angle is between -5
degrees and +10 degrees (relative to horizon) for 5 seconds, and roll angle is less
than 10 degrees for 5 seconds. Once the recovery maneuver is within these limits,
the UA symbology is replaced by the full-symbology mode, regardless of the
mode the HUD was in before encountering the unusual attitude.
The UA symbology includes a zenith symbol centered on the +90 degree pitch
scale line, and a nadir symbol centered on the -90 degree pitch scale line.
Digital Heading
A numerical digital heading value displays current heading below the roll scale
slip/skid indicator. This value corresponds to the heading on the horizon reference
line of the pitch scale.
787 Flight Crew Operations Manual
Flight Instruments, Displays -
Head-Up Display System
Description
10.22.4 Boeing Proprietary
Ground Excessive Deviation – Low Visibility Takeoff (Optional)
The ground excessive deviation symbol indicates localizer deviation during the
takeoff roll. This guidance is displayed when low visibility takeoff guidance has
been selected on the FMC. Once the airplane has deviated beyond a particular
criterion (TBD), a flashing triangle pointing in the direction of the runway
centerline will appear to assist in correcting for the deviation.
For additional information refer to Chapter 4 – Automatic Flight.
Runway Edge Lines
Runway edge lines is a projection of an 8,000 foot long, 200 foot wide runway,
superimposed over the calculated position of the actual runway. The runway edge
lines symbol is composed of the runway edge lines with two tick marks that
correspond to the touchdown aiming point (glideslope intercept point). The
symbol is enabled at a radio altimeter altitude of 300 feet, and removed at 60 feet.
The calculations depend on the selected course for the ILS/GLS/IAN approach, as
well as inputs from pitch, roll, heading, barometric altitude, localizer deviation,
glideslope deviation, and the glideslope angle and elevation from the FMS.
Flight Path Symbol with Guidance Cue
The flight path symbol is derived from the inertial sources, and provides an
indication of where the airplane is going. The flight path angle is indicated by the
position of the center of the flight path circle relative to the pitch scale.
The flight path symbol’s inverted "gull-wing" wing roots are angled downward
30 degrees to the horizontal. In a 30 degree level turn, the upward wing’s wing root
will align with the HUD horizon reference line.
The flight path symbol is only displayed in flight, and has display priority over all
other symbols except the guidance cue. If any portion of another symbol
(excluding guidance cue) is positioned inside the circle of the flight path symbol,
that portion is not displayed.
The flight path symbol appearance can be limited laterally by other symbology
such as speed and altitude tapes, or the display field-of-view. When this occurs,
the flight path symbol is "ghosted", meaning it is displayed with a dashed outline
rather than a solid outline.
The guidance (small circle) cue is associated with the flight path symbol. This
guidance cue represents flight director guidance, and is displayed when the flight
directors are turned on. To track the guidance cue, position the circular body of the
flight path symbol around the guidance cue.
During a windshear alert condition, the guidance cue will transform from hollow
to solid (filled). For information on windshear alerting, refer to Chapter 15 –
Warning Systems.
787 Flight Crew Operations Manual
Flight Instruments, Displays -
Head-Up Display System
Description
Boeing Proprietary 10.22.5
TO/GA Reference Line
In TO/GA mode, flight director vertical guidance is depicted as a horizontal
dashed (pitch target) line across the HUD pitch scale. To comply with this
guidance, place the airplane reference symbol on the TO/GA reference line.
　
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