曝光臺 注意防騙 網曝天貓店富美金盛家居專營店坑蒙拐騙欺詐消費者

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. Likewise, 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
• ground speed is greater than 65 knots, or pitch command is greater than
10 degrees.
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 symbol and the
guidance cue.
Glideslope Reference Line
During approach, a horizontal dashed line across the HUD pitch scale depicts the
glideslipe (angle) of the active approach. The glideslope angle numerical value is
digitally displayed adjacent to the glideslope reference line.
Flight director guidance automatically places the guidance cue on the glideslope
reference line. Maintaining the flight path symbol around the guidance cue results
in the airplane decending on the glideslope at the desired angle.
During visual approaches, a precise descent angle to the runway is maintained by
overlaying the glideslope reference line on the runway touchdown zone. Then
maintain the flight path symbol on the glideslope reference line.
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 symbol represents the margin available before stick shaker will occur.
When the AOA limit symbol is positioned on the flight path symbol (boxed ends
set on the flight path 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.
787 Flight Crew Operations Manual
Flight Instruments, Displays -
Head-Up Display System
Description
10.22.6 Boeing Proprietary
The AOA limit symbol is displayed during any of the following:
• angle of attack is within 5 degrees of stick shaker, or
• stick shaker is active, or
• windshear alerting with (solid) guidance cue displayed.
Slip/Skid Indicators (SSI)
The Slip/Skid symbology consists of two symbols:
• roll scale slip/skid indicator (SSI), 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 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.
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.
TCAS operation is described in Chapter 15, Warning Systems.
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 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. Likewise, if the
indicated airspeed is slower than the selected speed, the speed error tape falls
below the wing. Each one-degree of speed error tape length (approximately the
diameter of the flight path 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.
787 Flight Crew Operations Manual
Flight Instruments, Displays -
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：787機組操作手冊Flight Crew Operations Manual 2(107)