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• Fly G/P and FAC, for NDB.
• Fly G/P and LOC, for ILS if G/S is selected OFF.
• Fly G/P and LOC, for IGS if G/S is selected OFF.
• Fly G/P and LOC, for LOC.
• Fly G/P and LOC, for LDA if G/S is selected OFF.
• Fly G/P and LOC, for SDF if G/S is selected OFF.
• Fly G/P and B/CRS, for BAC.
For any of the three approach types, pushing the APP switch arms the pitch and
roll modes after an approach procedure selection is made in the FMC.
Pushing the LOC/FAC switch arms the AFDS to capture and maintain an
approach lateral flight path to a runway using an ILS localizer beam or a lateral
path provided by the FMC. Descent on the localizer or final approach course can
be accomplished using VNAV, V/S, FLCH, or FPA pitch modes. The LOC or FAC
mode cannot capture if the intercept angle exceeds 120 degrees.
With a command speed of VREF+5 knots and landing flaps, there is sufficient
wind and gust protection available with the autothrottle activated. The autothrottle
adjusts thrust quickly when the airspeed decreases below the command speed. The
autothrottle decreases thrust slowly when the airspeed is more than the command
speed. In turbulence, the result is that the thrust average is higher than necessary
to keep the command speed. This causes the speed average to be more than the
command speed.
787 Flight Crew Operations Manual
Automatic Flight -
System Description
Boeing Proprietary 4.20.15
Runway Alignment
Runway alignment is a submode of the approach mode. With crosswinds, the crab
angle is reduced at touchdown. Runway alignment also compensates for a single
engine approach.
For crosswinds requiring more than 10 degrees of crab angle, initial runway
alignment occurs at 500 feet AGL. A sideslip of 5 degrees is established to reduce
the crab angle. This configuration is maintained to 200 feet AGL, where a second
sideslip alignment increases the sideslip, up to 5 degrees total, to further reduce
the crab angle. This configuration is maintained until touchdown. The airplane
lands with a minimum of a 5 degree crab angle.
For crosswinds requiring a crab angle of between 5 and 10 degrees, an initial
alignment occurs at 500 feet AGL, followed by a second alignment at 200 feet
AGL. The initial alignment initiates a sideslip to reduce the crab angle to 5
degrees. This configuration is maintained to 200 feet AGL, where a second
sideslip alignment increases the sideslip to further reduce the touchdown crab
angle.
For crosswinds requiring a crab angle of less than 5 degrees, no runway alignment
occurs until 200 feet AGL, where a sideslip is introduced to align the airplane with
the runway.
If an engine fails prior to the approach, the AFDS introduces an after rudder
engagement sideslip at 500 feet AGL. This establishes a wings level
configuration. If an engine fails during the approach, the wings level configuration
is established when the engine failure is detected.
In the event of moderate or strong crosswinds from the side opposite the failed
engine, no wings level sideslip is commanded, since the airplane is already banked
into the wind.
Flare
The flare mode brings the airplane to a smooth automatic landing touchdown. The
flare mode is not intended for single autopilot or flight director only operation.
Flare is armed when LAND 3 or LAND 2 is annunciated on the PFDs and HUDs.
At approximately 50 feet radio altitude, the autopilots start the flare maneuver.
FLARE replaces the pitch flight mode annunciation.
During flare:
• between 25 and 50 feet radio altitude, the autothrottle begins retarding the
thrust levers to idle
• the PFD and HUD autothrottle annunciation changes from SPD to IDLE
• at touchdown, the FLARE annunciation is no longer displayed, and the
nose is lowered to the runway.
787 Flight Crew Operations Manual
Automatic Flight -
System Description
4.20.16 Boeing Proprietary
Rollout
Rollout provides localizer centerline rollout guidance. Rollout is armed when
LAND 3 or LAND 2 is annunciated on the PFD and HUDs.
At less than two feet radio altitude, rollout engages. ROLLOUT replaces the roll
mode annunciation.
The autopilot controls the rudder and nose wheel steering to keep the airplane on
the localizer centerline.
During rollout, the autothrottle IDLE mode remains activated until the autothrottle
is disconnected.
Rollout guidance continues until the autopilots are disengaged.
787 Flight Crew Operations Manual
Automatic Flight -
System Description
Boeing Proprietary 4.20.17
Automatic Flight Approach Profile (ILS)
SPD LOC FLARE
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787机组操作手册Flight Crew Operations Manual 2(8)
