737 Flight Crew Operations Manual
Automatic Flight -
System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
4.20.10 D6-27370-866-EGP
Both F/Ds must be ON to engage the takeoff mode prior to starting the takeoff.
The F/D takeoff mode is engaged by pushing the TO/GA switch on either thrust
lever. The FMAs display FD as the A/P status, TO/GA as the pitch mode, and
blank for the roll mode.
During takeoff, pushing a TO/GA switch engages the autothrottle in the N1 mode.
The A/T annunciation changes from ARM to N1 and thrust levers advance toward
takeoff thrust.
The F/D can also be engaged in the takeoff mode with the F/D switches off. If a
TO/GA switch is pushed after 80 knots below 2000 feet AGL and prior to 150
seconds after lift–off, the F/D command bars automatically appear for both pilots.
During takeoff, prior to 60 KIAS:
• the pitch command is 10 degrees nose down
• the roll command is wings level
• the autothrottle is engaged in the N1 mode
• thrust levers advance until the engines reach takeoff thrust
• the FMAs display N1 for the autothrottle mode, TO/GA for the pitch
mode, and blank for the roll mode.
At 60 knots, the F/D pitch commands 15 degrees nose up.
At 84 knots, the A/T mode annunciates THR HLD.
At LIFT-OFF:
• the pitch command continues at 15 degrees until sufficient climb rate is
acquired. Pitch then commands MCP speed (normally V2) plus 20 knots
• if an engine failure occurs during takeoff, the pitch command target
speed is:
• V2, if airspeed is below V2
• existing speed, if airspeed is between V2 and V2 + 20
• V2 + 20, if airspeed is above V2 + 20
• the roll command maintains wings level.
After LIFT-OFF:
• the A/T remains in THR HLD until 800 feet above field elevation. A/T
annunciation then changes from THR HLD to ARM and reduction to
climb thrust can be made by pushing the N1 switch.
Note: During a reduced thrust takeoff, a second press of the TO/GA switch
below 800 feet above field elevation will change the thrust limit
mode to GA and N1 reference bugs to increase to full GA thrust,
thrust levers will not be in motion. A second press of the TO/GA
switch above 800 feet above field elevation, thrust levers advance
toward full GA thrust.
September 15, 2016
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