787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Automatic Flight -
System Description
Copyright © The Boeing Company. See title page for details.
4.20.20 D615Z003-TBC
Go–Around
TO/GA is armed when flaps are out of UP or glideslope is captured. The thrust
limit changes to GA when flaps are extended out of UP, flaps are extended to
landing position, or glideslope is captured. The thrust limit is locked in GA when
flaps are in landing position or glideslope is captured.
Pushing either TO/GA switch activates a go-around. The mode remains active
even if the airplane touches down while executing the go–around.
[Option – Split cue]
When the flight director switches are not on, pushing either TO/GA switch
displays the flight director bars.
The TO/GA switches are inhibited when on the ground and enabled again when
in the air for a go–around or touch and go.
With the first push of either TO/GA switch:
• the PFDs and HUDs display roll and pitch guidance to fly the go–around
• the autothrottle activates in thrust (THR) mode for a 2,000 FPM climb
• the AFDS increases pitch to hold the selected speed as thrust increases
• if current airspeed remains above the target speed for 5 seconds, the target
airspeed is reset to current airspeed, (to a maximum of the IAS/MACH
window speed plus 25 knots)
• if an LNAV path is available, LNAV automatically arms and engages:
• above 50 feet radio altitude when autopilot is not engaged, or
• above 200 feet radio altitude when autopilot is engaged
Note: During go-around from a LAND 2 or LAND 3 approach, automatic LNAV
engagement causes disconnect of autopilot rudder control, but control is
taken over by primary flight control system.
With the second push of either TO/GA switch:
• the autothrottle activates in the thrust reference (THR REF) mode for full
go–around thrust
TO/GA level–off:
• at the selected altitude, the AFDS pitch mode changes to altitude hold
(ALT)
• if altitude is captured, or if V/S or FPA is engaged, MCP speed is
automatically set to:
• the flap placard speed minus 5 knots
• 250 knots if flaps are up, or
• a speed value entered in the IAS/MACH window after TO/GA was
pushed
• go–around remains the engaged roll mode until LNAV automatically
engages or another mode is selected
February 15, 2010
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