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.
10.22.4 D615Z003-TBC
Ground Deviation - Low Visibility Takeoff
[Option – HUD low visibility takeoff]
During a low visibility takeoff, ground deviation indications include the ground
reference cue, flight director guidance cue, and ILS/GLS localizer deviation
pointer. This guidance is available when low visibility takeoff guidance has been
selected on the FMC. (Refer to Departures Page
in Chapter 11, Section 40, for
additional information.) These indications become active when the heading of the
airplane is within 2º of the center of the ILS localizer beam or 75 feet of the GLS
localizer centerline. If the airplane then deviates more than seven meters (23 feet)
right or left from the runway centerline, a flashing triangle appears, pointing in the
direction of the runway centerline, to assist in correcting for the deviation.
(Refer to HUD Takeoff
in Chapter 4, Section 20, for additional information.)
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.
During takeoff roll, this line is initially fixed at the top of the display. A flight
director pitch up command is displayed when the TO/GA reference line is
positioned above the airplane reference symbol. A pitch down command is
displayed when the TO/GA reference line is positioned below the airplane
reference symbol.
A TO/GA reference line is displayed when all of the following conditions are true:
• flight director TO/GA mode is active, and
• groundspeed is greater than 65 knots, or pitch command is greater than 10º
Once in flight, the spacing between the TO/GA reference line and the airplane
reference symbol is equal to the spacing between the flight path vector symbol and
the guidance cue.
Flight Path Vector Symbol with Guidance Cue
The flight path vector 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 vector symbol’s "gull wing" wing roots are angled downward 30º
to the horizontal. In a 30º bank angle, the upward wing’s wing root will be parallel
with the HUD horizon and pitch scale lines.
The flight path vector 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 vector
symbol, that portion of the other symbol is not displayed.
February 15, 2010
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