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bar. When the degradation is no longer present the flight director commands
immediately return to view.
ILS Signal Interference Monitor
The autopilot flight director system (AFDS) can detect significant ILS signal
interference due to service vehicles or aircraft. If localizer or glideslope signal
interference is detected, the autopilot disregards the ILS signal and remains
engaged in an attitude stabilizing mode based on inertial data. Most ILS signal
interferences last only a short period of time, so there is no annunciation other than
erratic movement of the ILS raw data during the time the interference is present.
If the condition persists, the annunciations described above for Autopilot and
Flight Director Mode Degradation are provided.
Flight Director Display
The flight director steering indications are normally displayed any time the related
flight director switch is ON.
The steering indications are also displayed when the related flight director switch
is OFF and a TO/GA switch is pushed, if airspeed is greater than 80 knots and the
flaps are not retracted. In this case, the flight director display can be removed by
cycling the respective flight director switch on and then off.
787 Flight Crew Operations Manual
Automatic Flight -
System Description
4.20.4 Boeing Proprietary
A flight director mode failure, in either pitch or roll, causes the respective steering
bars to disappear. The stall and overspeed protection functions will also cause the
pitch flight director bar to disappear.
Autopilot Flight Director System Schematic
AFDS Status Annunciation
The following AFDS status annunciations are displayed just above the PFD and
HUD attitude display:
• FLT DIR (the flight director is ON and the autopilots are not engaged)
• A/P (the autopilots are engaged)
• LAND 3 (three autopilots are engaged and operating normally for an
automatic landing)
FMS
CDUs
ACEs
FLIGHT CONTROL SURFACES
AFDS
PFCs
PRELIMINARY
DOWN
UP
30
VS/FPA HOLD APP
LOC/FAC
A/P
HOLD
LNAV
A/T FLCH
CLB/CON
A/P
A/T ARM
L R
OFF
IAS MACH
IAS
UL
200
250
A/P DISENGAGE
XFR
UL RL
HDG 200
200
AUTO
5
BANK
LIMIT
HDG TRK V/S FPA
V/S
ALTITUDE
17000
12000
+2000
VNAV
OFF
ON
F/D
OFF
ON
F/D
SEL
AUTO 1000
XFR XFR
UL
Fly–by–Wire
Flight Control
System
(Chapter 9)
A/Ps
787 Flight Crew Operations Manual
Automatic Flight -
System Description
Boeing Proprietary 4.20.5
• LAND 2 (AFDS redundancy is reduced; in some cases, only two
autopilots are available)
• NO AUTOLAND (the AFDS is unable to make an automatic landing).
With a LAND 3 indication, the autopilot system level of redundancy is such that
a single fault cannot prevent the autopilot system from making an automatic
landing (fail operational).
With a LAND 2 indication, the level of redundancy is such that a single fault
cannot cause a significant deviation from the flight path (fail passive).
An EICAS message is displayed for any fault which limits the capability of the
automatic landing system. Aural alerts for EICAS messages not affecting safety
of flight are inhibited until after touchdown. Changes in autoland status below 200
feet, other than a transition to NO AUTOLAND status, are inhibited.
AFDS Flight Mode Annunciations
The flight mode annunciations are displayed just above the PFD and HUD AFDS
status annunciations. The mode annunciations, from left to right, are:
• autothrottle
• roll
• pitch.
Engaged or captured modes are shown at the top of the flight mode annunciator
boxes in large green letters. Armed modes (except for TO/GA in the air) are shown
in smaller letters (white on the PFD) at the bottom of the flight mode annunciator
boxes. Degradations of a specific mode while the autopilot is engaged are
annunciated by an line (amber on the PFD) drawn through the mode
annunciations. A green box is drawn around the mode annunciation for 10 seconds
when a mode first becomes active, and when the line through a degraded mode is
removed.
Autothrottle Modes
The autothrottle modes are:
• THR – The autothrottle applies thrust to maintain the vertical speed
required by the pitch mode.
• THR REF – Thrust is set to the selected thrust limit displayed on EICAS.
• IDLE – Displayed while the autothrottle moves the thrust levers to idle;
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787机组操作手册Flight Crew Operations Manual 2(3)
