Automatic Flight -Controls and Indicators 737 Flight Crew Operations Manual

Autothrottle (A/T) Engaged Mode
.
N1 (green)

.
GA (green)

.
Retard (green)

.
FMC SPD (green)

Roll Engaged Mode
.
HDG SEL (green)

.
VOR/LOC (green)

Roll Armed Mode
. VOR/LOC (white)

Pitch Engaged Mode
.
TO/GA (green)

.
V/S (green)

.
MCP SPD (green)

.
ALT ACQ (green)

.
ALT HOLD (green)

Mode Highlight Change Symbol
.
MCP SPD (green)

.
THR HLD (green)

.
ARM (white)

.
LNAV (green)

.  
G/S (green)

.  
FLARE (green)

.
VNAV SPD (green)

.
VNAV PTH (green)

A mode change highlight symbol (rectangle) is drawn around each pitch, roll, CWS, A/P status, and thrust engaged mode annunciation for a period of 10
seconds after each engagement.

CWS Roll Engaged
.CWS R (amber)

Autopilot Status
.  
CMD (green) YA613 - YA809, YC411, YC413

.
SINGLE CH (amber)

CWS Pitch Engaged
.CWS P (amber)
. FD (green)
Copyright . The Boeing Company. See title page for details.
Automatic Flight -Controls and Indicators 737 Flight Crew Operations Manual

Pitch Armed Mode
.
G/S (white) . G/S V/S (white)

.
V/S (white) .FLARE (white)

Copyright . The Boeing Company. See title page for details.
4.10.28  March 28, 2005

737 Flight Crew Operations Manual

General
The automatic flight system (AFS) consists of the autopilot flight director system (AFDS) and the autothrottle (A/T). The flight management computer (FMC) provides N1 limits and target N1 for the A/T and command airspeeds for the A/T and AFDS.
The AFDS and A/T are controlled using the AFDS mode control panel (MCP) and the FMC. Normally, the AFDS and A/T are controlled automatically by the FMC to fly an optimized lateral and vertical flight path through climb, cruise and descent.
AFS mode status is displayed on the flight mode annunciation on each pilot’s primary display.
Autopilot Flight Director System (AFDS)
The AFDS is a dual system consisting of two individual flight control computers

(FCCs) and a single mode control panel.
The two FCCs are identified as A and B. For A/P operation, they send control
commands to their respective pitch and roll hydraulic servos, which operate the
flight controls through two separate hydraulic systems.

For F/D operation, each FCC positions the F/D command bars on the respective
attitude indicator.

MCP Mode Selector Switches
The mode selector switches are pushed to select desired command modes for the AFDS and A/T. The switch illuminates to indicate mode selection and that the mode can be deselected by pushing the switch again. While a mode is active, deselection can be automatically inhibited and is indicated by the switch being extinguished.
When engagement of a mode would conflict with current AFS operation, pushing the mode selector switch has no effect. All AFDS modes can be disengaged either by selecting another command mode or by disengaging the A/P and turning the F/Ds off.
Copyright . The Boeing Company. See title page for details.
Automatic Flight -System Description 737 Flight Crew Operations Manual

Autopilot Engagement Criteria
Each A/P can be engaged by pushing a separate CMD or CWS engage switch. A/P engagement in CMD or CWS is inhibited unless both of the following pilot–controlled conditions are met:
.  
no force is being applied to the control wheel

.
the STAB TRIM AUTOPILOT cutout switch is at NORMAL. Only one A/P can be engaged at a given time unless the approach (APP) mode is engaged. Approach mode allows both A/Ps to be engaged at the same time. Dual

A/P operation provides control through landing flare and touchdown or an automatic go–around.
In single A/P operation, full automatic flare and touchdown capability and A/P go–around capability are not available.
Autopilot Disengagement
The A/P automatically disengages when any of the following occurs:
.  
pushing either A/P disengage switch
YA626, YA686, YA721 - YA803, YC153, YC411, YC413

.  
pushing either Takeoff/Go–around (TO/GA) switch with a single A/P
engaged in CWS or CMD below 2000 feet RA unless flaps are up or G/S
not engaged.

YA613, YA687, YA809, YC154, YD651 - YK104

.  
pushing either Takeoff/Go-around (TO/GA) switch with a single A/P
engaged in CWS or CMD above 2000 feet RA with flaps not up or G/S
　
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