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.
D615Z003-TBC 10.22.5
The flight path vector 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 FPV symbol has a dashed outline instead of a solid outline and can
not indicate the airplane’s current drift angle.
The guidance cue (small circle) is associated with the flight path vector symbol.
This cue represents flight director guidance, and is displayed when the flight
directors are turned on. To follow flight director guidance, position the circular
body of the flight path vector symbol around the guidance cue. The guidance cue
appears at 50 feet RA on takeoff. If a low visibility takeoff is selected, the
guidance cue appears at the same time as the flight path vector.
During a windshear alert condition, the guidance cue will change from hollow to
solid (filled). (Refer to Alerts Displayed on the HUD
in Chapter 15, Section 10,
for additional information.)
Angle-of-Attack Limit Symbol
The airplane's angle-of-attack (AOA) limit is depicted on the HUD by the
angle-of-attack limit symbol. The distance between the AOA limit symbol and the
flight path vector symbol represents the margin available before stick shaker
occurs. When the AOA limit symbol is positioned on the flight path vector symbol
(boxed ends set on the flight path vector symbol wings), the airplane is at the stick
shaker angle of attack.
The PFD contains a similar symbol called the pitch limit indicator (PLI).
However, on the PFD, the PLI is displayed relative to the airplane reference
symbol, not to the flight path vector.
The AOA limit symbol is displayed during any of the following:
• angle of attack is within 5º of stick shaker, or
• stick shaker is active, or
• windshear alerting with (solid) guidance cue displayed
Slip/Skid Indicators
The Slip/Skid symbology consists of two symbols:
• roll scale slip/skid indicator is referenced to and rotated with the roll scale
pointer (or referenced to the UA roll scale pointer, whichever is displayed).
• flight path slip/skid indicator referenced to the flight path vector symbol
The flight path slip/skid indicator is only displayed during a takeoff, or a
low-altitude go-around, providing additional yaw reference in the case of an
engine failure. At low altitude, the sensitivity of the slip/skid indicators is
enhanced to provide additional awareness.
February 15, 2010
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