787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Automatic Flight -
System Description
Copyright © The Boeing Company. See title page for details.
4.20.16 D615Z003-TBC
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 10º of crab angle, runway alignment occurs at
500 feet AGL. A sideslip of 5º is established to reduce the crab angle. This
configuration is maintained until touchdown. The airplane lands with a minimum
of a 5º crab angle.
For crosswinds requiring a crab angle of between 5º and 10º, 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 5º. 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 5º, 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
Rollout
Rollout provides localizer centerline rollout guidance. Rollout is armed when
LAND 3 or LAND 2 is annunciated on the PFD and HUDs.
February 15, 2010
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