.  
localizer can be intercepted in HDG SEL, LNAV, or CWS R
YA613 - YA809, YC411 - YK104

.
SINGLE CH annunciates in A/P Status Display after localizer capture

.  
for single autopilot approach, SINGLE CH remains annunciated for entire approach

.  
for dual autopilot approach, SINGLE CH annunciation extinguishes when second autopilot engages and FLARE armed is annunciated

.
glideslope capture occurs at 2/5 dot below glideslope

.
APP switch light extinguishes after localizer and glideslope capture.

After localizer and glideslope capture, APP mode can be disengaged by:
.
pushing a TO/GA switch

.
disengaging autopilot(s) and turning off both F/D switches

.
retuning the VHF NAV receiver. While engaged in the APP mode:

.  
the A autopilot and Captain’s F/D use information from Captain’s Course
Selector and No. 1 VHF NAV receiver

.  
the B autopilot and First Officer’s F/D use information from First
Officer’s Course Selector and No. 2 VHF NAV receiver

.  
different courses and/or frequencies for the two VHF NAV receivers can
cause disagreement between Captain’s and First Officer’s F/D displays
and affect A/P operation.

Copyright . The Boeing Company. See title page for details.

Automatic Flight -Controls and Indicators 737 Flight Crew Operations Manual

Autopilot / Flight Director
Pushing a CMD or CWS switch engages related A/P in CMD or CWS and illuminates switch lights. A/P can operate in CMD, CWS, or a combination of CMD and CWS.
YC411 -YK104
CMD  CMD 

CWS  CWS 

YA613 - YC154

Command Engage (CMD ENGAGE) Switch (A or B):
Push –
.
engages A/P

.
enables all command modes

.
displays CMD in A/P status display

.  
pushing an engage switch for second A/P, while not in approach mode, engages second A/P and disengages first A/P

.
enables CWS operation

.
CWS engages if:

.
pitch or roll mode not selected

.
pitch or roll mode deselected

Copyright . The Boeing Company. See title page for details.
4.10.18   June 1, 2005

Automatic Flight -Controls and Indicators 737 Flight Crew Operations Manual
.
pitch or roll mode manually overridden with control column force.

.
CWS engaged displays:

.
CWS P and/or CWS R in A/P status display

.
blank in pitch and/or roll mode FMA

.  
when approaching a selected altitude in CWS P, the pitch mode engages
in ALT ACQ and ALT HOLD when reaching selected altitude

.  
when approaching a selected radio course in CWS R with VOR/LOC or
approach mode armed, VOR/LOC engages when course is intercepted

.  
if pitch is manually overridden while in ALT HOLD and control force is
released within 250 feet of selected altitude, A/P pitch mode engages in
ALT ACQ and returns to selected altitude in ALT HOLD mode.

Note:  During F/D only operation while pitch or roll commands are more than 1/2 scale from center, pushing a CMD A or B switch engages the A/P in CWS for pitch and/or roll and the related F/D bar(s) retract.

Control Wheel Steering Engage (CWS ENGAGE) Switch (A or B):
Push –
.
engages A/P

.  
engages pitch and roll modes in CWS. Other pitch and roll modes not
enabled

.
displays CWS P and CWS R in A/P status display

.
CMD not displayed in A/P status display

.  
F/Ds, if ON, display guidance commands and FD annunciates in A/P
status display. A/P does not follow commands while in CWS

.
A/P pitch and roll controlled by pilot with control wheel pressure

.  
when control pressure released, A/P holds existing attitude. If aileron
pressure released with 6 degrees or less bank, the A/P rolls wings level
and holds existing heading. Heading hold feature inhibited:

.
below 1500 feet RA with gear down

.
after LOC capture in APP mode

.
after VOR capture with TAS 250 knots or less.

Autopilot Disengage (DISENGAGE) Bar
Pull down –
.
exposes yellow background

.
disengages both A/Ps

.
prevents A/P engagement.

Lift up –
.
conceals yellow background

.
enables A/P engagement.
　
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