787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Automatic Flight -
System Description
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 4.20.11
Automatic Flight Operations
Automatic Flight Takeoff and Climb
Takeoff is a flight director only function of the takeoff/go–around (TO/GA) mode.
The autopilot may be engaged after takeoff.
During preflight:
• With the autopilot disengaged and both flight director switches OFF,
engagement of TO/GA roll and pitch mode occurs when the first flight
director switch is positioned ON
• the PFD and HUD displays FLT DIR as the AFDS status and TO/GA as
the pitch and roll flight mode annunciations
• the PFD pitch command is a fixed attitude (about 8º up)
• the PFD roll command is wings level
During takeoff prior to lift–off:
• with speed less than 50 KIAS, pushing a TO/GA switch activates the
autothrottle in the thrust reference (THR REF) mode. The thrust levers
advance to the selected thrust limit. If the autothrottle is not active by 50
knots, it cannot be activated until above 400 feet
• at 80 knots, the autothrottle mode annunciation changes to HOLD
• with speed greater than 80 knots, pushing a TO/GA switch disarms LNAV
and VNAV
At lift–off:
• the pitch command target speed is V2 + 15. If current airspeed remains
above the target speed for 5 seconds, the target airspeed is reset to current
airspeed (limited to a maximum of V2 + 25)
• if an engine failure occurs on the ground, the pitch command target speed
at lift–off is V2 or airspeed at lift–off, whichever is greater
• the roll command maintains ground track
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
• A/T in HOLD, the A/T activates in THR REF
• at 50 feet radio altitude, LNAV engages, if armed. Roll commands bank to
track the active route
August 14, 2009
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