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After lift–off:
• If an engine failure occurs, the pitch command target speed is:
• V2, if airspeed is below V2
• existing speed, if airspeed is between V2 and V2 + 15
• V2 + 15, if airspeed is above V2 + 15.
• If a TO/GA switch is pushed:
• takeoff derates are removed
• the autothrottle activates in THR REF.
787 Flight Crew Operations Manual
Automatic Flight -
System Description
4.20.12 Boeing Proprietary
• At 50 feet radio altitude, LNAV engages, if armed. Roll commands bank
to track the active route.
• At 400 feet above runway elevation, VNAV engages, if armed. Pitch
commands the current airspeed. The autothrottle sets the selected
reference thrust and annunciates THR REF.
• At acceleration height, pitch commands speed to 5 knots below takeoff
flap placard speed. As flaps are retracted, pitch commands an acceleration
to 5 knots below the placard speed of the commanded flap position.
• When flaps are up, pitch commands an acceleration to VNAV climb
speed. VNAV climb speed is the greater of:
• 250 knots, or
• VREF + 80 knots.
• At thrust reduction point (either an altitude or a flap position), the FMC
changes the thrust limit to the armed climb limit (CLB, CLB 1, or CLB 2).
The TO/GA mode is terminated by selecting any other pitch and roll mode;
automatic LNAV/VNAV engage terminates TO/GA mode.
HUD Takeoff (Optional)
The low visibility takeoff guidance system provides lateral guidance on the HUD
for takeoff roll and rejected takeoff using ILS or GLS signals. Selecting a HUD
TAKEOFF departure in the FMC and turning either flight director on sets HUD
TO/GA as the engaged roll mode on the PFD and HUD and enables the guidance.
Guidance becomes active and guidance cue appears on the HUD when the
airplane approaches the runway center line and airplane heading is within 45
degrees of runway heading. The lateral flight director bar on the PFD also moves
with the guidance commands, but is not certified for use during a low visibility
takeoff. For additional information, refer to Chapter 10 - Flight Instruments,
Displays.
787 Flight Crew Operations Manual
Automatic Flight -
System Description
Boeing Proprietary 4.20.13
Automatic Flight Takeoff Profile
Automatic Flight En Route
The autopilot and/or the flight director can be used after takeoff to fly a lateral
navigation track (LNAV) and a vertical navigation track (VNAV) provided by the
FMS. Using LNAV and VNAV ensures the most economical operation.
Other roll modes available are:
Other pitch modes available are:
Profile illustrations show the use of LNAV and VNAV.
• heading hold (HDG HOLD)
• heading select (HDG SEL)
• track hold (TRK HOLD)
• track select (TRK SEL).
• altitude hold (ALT)
• flight level change (FLCH
SPD)
• vertical speed (V/S)
• flight path angle (FPA).
HOLD
A/P
THR REF
THR REF LNAV VNAV SPD
THR REF LNAV VNAV SPD
FLT DIR
FLT DIR
FLT DIR
FLT DIR
HOLD LNAV TO/GA
TO/GA
TO/GA
TO/GA
TO/GA
VNAV
VNAV
VNAV
LNAV
LNAV
A/P engage
400 feet above
50 feet radio
80 knots –
VNAV/LNAV
armed – push
TO/GA
switch(es)
switch push –
A/P engages
runway
elevation –
VNAV engages
and
autothrottle
THR REF
activates.
altitude –
LNAV engages
autothrottle
HOLD activates
787 Flight Crew Operations Manual
Automatic Flight -
System Description
4.20.14 Boeing Proprietary
Automatic Flight Approach and Landing
The AFDS provides autopilot guidance for Instrument Landing System (ILS),
GPS Landing System (GLS) and Integrated Approach Navigation (IAN)
approaches.
ILS approaches are flown in the G/S and LOC modes with the approach path
deviation data from the localizer and glideslope transmitters.
GLS approaches are also flown in the G/S and LOC modes, but the approach path
deviation data is from the Ground Based Augmentation System (GBAS).
IAN approaches can be flown in the G/P and FAC, LOC or B/CRS modes. For the
G/P and FAC modes, the FMC computes a three-dimensional path and sends ILS
look-alike deviations to the autopilots. For the LOC and B/CRS modes, the
localizer provides the deviation information. The IAN function is available for the
following instrument approach types:
• Fly G/P and FAC, for RNV.
• Fly G/P and FAC, for GPS.
• Fly G/P and FAC, for VOR.
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787机组操作手册Flight Crew Operations Manual 2(7)
