.  
engaging LVL CHG or VNAV climb modes automatically engages the
A/T N1 mode

.  
engaging LVL CHG or VNAV descent modes automatically engages the
A/T in RETARD and then ARM when thrust is at idle

.  
if not in a VNAV mode, engagement of ALT ACQ or ALT HOLD
automatically engages the A/T in the MCP SPD mode; otherwise the A/T
remains in FMC SPD

.  
engagement of G/S capture automatically engages the A/T in the MCP
SPD mode

.  
alpha floor automatically engages the A/T when armed.

Autothrottle Disengagement
Any of the following conditions or actions disengages the A/T:
.  
moving the A/T Arm switch to OFF

.  
pushing either A/T Disengage switch

.  
an A/T system fault is detected

.  
two seconds have elapsed since landing touchdown
YA613 - YC154

.  
thrust levers become separated more than 10 degrees during a dual

channel approach after FLARE armed is annunciated
YC411 - YK104

.  
thrust levers become separated more than 10 degrees
YA613 - YC154

.  
significant thrust difference along with control wheel roll input of 10
degrees or more, and flap position up through 10.

Copyright . The Boeing Company. See title page for details.
4.20.8   September 29, 2005

Automatic Flight -System Description 737 Flight Crew Operations Manual
YC411 - YK104
.  significant thrust difference along with control wheel roll input of 10
degrees or more at any point throughout the entire flight envelope. A/T disengagement is followed by A/T Arm switch releasing to OFF and flashing red A/T Disengage lights. The A/T Disengage lights do not illuminate when the A/T automatically disengages after landing touchdown.
Automatic Flight Operations
The phases of flight for automatic flight operations are:
.  
Takeoff and climb . Approach and landing

.  
Enroute . Go–around

Automatic Flight Takeoff and Climb
Takeoff is a flight director only function of the TO/GA mode. Flight director pitch
and roll commands are displayed and the autothrottle maintains takeoff N1 thrust
limit as selected from the FMC. The autopilot may be engaged after takeoff.

YA686, YA687
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.

YA613, YA626, YA721 - YK104
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
HDG SEL as 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.

YA686, YA687
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.

Copyright . The Boeing Company. See title page for details.
Automatic Flight -System Description 737 Flight Crew Operations Manual

YA613, YA626, YA721 - YK104 During takeoff, prior to 60 KIAS:
.  
the pitch command is 10 degrees nose down

.  
the roll command is HDG SEL

.  
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 HDG SEL 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.
　
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