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.
10.22.6 D615Z003-TBC
TCAS Fly-To Symbology
A corrective advisory is displayed on the HUD by a double lined box called the
"fly-to box". The fly-to box is an indication of where the flight path vector symbol
should be positioned in order to obtain vertical separation from traffic, directing
an evasive maneuver.
For additional information, refer to:
•(TCAS HUD Vertical Guidance
, Ch. 15, Sec. 10)
•(TCAS HUD and PFD Vertical Guidance
, Ch. 15, Sec. 20)
Speed Error Tape and Flight Path Acceleration
The speed error tape shows the difference between the indicated airspeed and the
selected airspeed on the mode control panel. Selected airspeed on takeoff is V2,
whereas flight director guidance airspeed is V2 + 15. In order to prevent an
incorrect interpretation of the speed error tape, the symbol is not displayed until
the first flap retraction.
The speed error tape is positioned on the left wing of the flight path vector symbol,
adjacent to the flight path acceleration symbol. If the indicated airspeed is faster
than the selected speed, the speed error tape rises above the wing. If the indicated
airspeed is slower than the selected speed, the speed error tape falls below the
wing. Each 1º of speed error tape length (approximately the diameter of the flight
path vector symbol circle) represents approximately 5 knots of airspeed error. The
tape length is limited to a 15 knot error indication.
The inertial acceleration (or deceleration) of the airplane along the flight path is
indicated by the flight path acceleration symbol " > ". This symbol is an indication
of the total sum of all forces affecting the airplane.
In flight, the flight path acceleration symbol is positioned to the left of the flight
path vector symbol. When flight path acceleration symbol is above the wing of the
flight path vector symbol, the airplane is accelerating. When it is below the flight
path vector symbol wing, the airplane is decelerating. To maintain a steady state
(neither accelerating nor decelerating), the flight path acceleration symbol is
positioned directly to the left of the left flight path vector symbol wing. When the
airplane is not in flight, or the flight path vector symbol is not displayed, then the
flight path acceleration symbol is referenced to the airplane reference symbol.
To avoid confusion in controlling airplane thrust, the flight path acceleration
symbol is removed from the display when a low-level, decreasing performance
windshear is detected below 400 feet AGL.
Glideslope Reference Line
During approach, a horizontal dashed line across the HUD pitch scale depicts the
projected glideslope angle of the active approach. The glideslope angle numerical
value is digitally displayed adjacent to the glideslope reference line.
February 15, 2010
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