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Localizer and Glideslope Armed
After setting the localizer frequency and course, pushing the APP switch selects the APP mode. The APP switch illuminates and VOR/LOC and G/S annunciate armed. The APP mode permits selecting the second A/P to engage in CMD. This arms the second A/P for automatic engagement after LOC and G/S capture and when descent below 1500 RA occurs.
The localizer can be intercepted in the HDG SEL, CWS R or LNAV mode.
Glideslope (G/S) capture is inhibited prior to localizer capture.
Localizer Capture
YC153, YC154 The LOC capture point is variable and depends on intercept angle and rate of closure, but does not occur at less than 1/2 dot. Upon LOC capture, VOR/LOC annunciates captured, the previous roll mode disengages and the airplane turns to track the LOC.
YA613 - YA809, YC411 - YK104 The LOC capture point is variable and depends on intercept angle and rate of closure, but does not occur at less than 1/2 dot. Upon LOC capture, VOR/LOC annunciates captured, SINGLE CH is annunciated for A/P status, the previous roll mode disengages and the airplane turns to track the LOC.
Copyright . The Boeing Company. See title page for details.
Automatic Flight -System Description 737 Flight Crew Operations Manual

Glideslope Capture
Glideslope capture is inhibited prior to localizer capture.
The G/S can be captured from above or below. Capture occurs at 2/5 dot and results in the following:
.  
G/S annunciates captured

.  
previous pitch mode disengages

.  
APP light extinguishes if localizer has also been captured

.  
airplane pitch tracks the G/S

.
GA displayed on thrust mode display (N1 thrust limit). After VOR/LOC and G/S are both captured, the APP mode can be exited by:

.  
pushing a TO/GA switch

.  
disengaging A/P and turning off both F/D switches

.  
retuning a VHF NAV receiver.

After LOC and G/S Capture
Shortly after capturing LOC or G/S and below 1500 feet RA:
.  
the second A/P couples with the flight controls

.  
test of the ILS deviation monitor system is performed and the G/S or LOC
display turns amber and flashes

.  
FLARE armed is annunciated
YA613 - YA809, YC411 - YK104

.  
the SINGLE CH annunciation extinguishes

.  
A/P go–around mode arms but is not annunciated.

The A/Ps disengage and the F/D command bars retract to indicate an invalid ILS signal.
800 Feet Radio Altitude
The second A/P must be engaged in CMD by 800 feet RA to execute a dual channel A/P approach. Otherwise, CMD engagement of the second A/P is inhibited.
400 Feet Radio Altitude
The stabilizer is automatically trimmed an additional amount nose up. If the A/Ps subsequently disengage, forward control column force may be required to hold the desired pitch attitude.
If FLARE is not armed by approximately 350 feet RA, both A/Ps automatically disengage.
Copyright . The Boeing Company. See title page for details.
4.20.14   June 1, 2005

Automatic Flight -System Description 737 Flight Crew Operations Manual
Flare
The A/P flare maneuver starts at approximately 50 feet RA and is completed at touchdown:
.  
FLARE engaged is annunciated and F/D command bars retract

.  
the A/T begins retarding thrust at approximately 27 feet RA so as to reach
idle at touchdown. A/T FMA annunciates RETARD.

.  
the A/T automatically disengages approximately 2 seconds after
touchdown.

.  
the A/P must be manually disengaged after touchdown. Landing rollout is
executed manually after disengaging the A/P.

 

Approach (APP) Mode Single A/P
A single A/P ILS approach can be executed by engaging only one A/P in CMD after pushing the APP mode select switch. Single A/P approach operation is the same as dual, with the following exceptions:
.  
full automatic flare and touchdown capability is not available. FLARE is

not annunciated and stabilizer trim bias is not applied
YA613 - YA809, YC411 - YK104

.  
A/P status of SINGLE CH is annunciated for the entire approach after
localizer capture

.  
an A/P go–around is not available.

Copyright . The Boeing Company. See title page for details.
Automatic Flight -System Description

Automatic Flight Approach Profile
YA613 - YA809, YC411 - YK104

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

Automatic Flight -System Description 737 Flight Crew Operations Manual
YC153, YC154

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