787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Automatic Flight -
System Description
Copyright © The Boeing Company. See title page for details.
4.20.12 D615Z003-TBC
• at 400 feet AGL, 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:
• VREF + 80 knots, or
• speed transition associated with origin airport
• 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
[Option – HUD low visibility takeoff]
Using ILS or GLS signals, the low visibility takeoff guidance system provides
lateral guidance on the HUD for takeoff roll and rejected takeoff. Selecting a HUD
TAKEOFF departure in the FMC and turning on either flight director enables the
guidance and sets HUD TO/GA as the engaged FMA roll mode. Once the airplane
approaches the runway center line and airplane heading is within 45º of runway
heading, guidance becomes active and the ground reference cue and localizer
deviation pointer appear. The guidance cue will center on the ground reference cue
once the airplane nose and the centerline of the runway are lined up.
Note: 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:
• Primary Flight Display (PFD)
, Ch. 10, Sec. 10
• Ground Deviation Indications – Low Visibility Takeoff
, Ch. 10, Sec. 12
February 15, 2010
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