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approach mode is very similar to the VOR cruise mode. When in
the VOR approach sequence, the beam deviation and course
error signal gains are smaller than when in the cruise mode.
The VOR mode changes to approach when these conditions
occur:
* True airspeed is less than 250 knots
* Radio altitude is below 1500 feet
* Landing gear is down.
LOC Approach Mode
When in the localizer mode, the ILS receiver supplies lateral
guidance to capture and track the localizer beam. The flight
crew uses the localizer only approach when glideslope is not
available or they use a different vertical path for descent.
G/S Approach Mode
When in the glideslope mode, the ILS receiver supplies vertical
guidance to capture and track the glideslope beam. To get into
the G/S mode you have to push the APP mode selector switch.
CWS Approach
You can use roll CWS for an approach. The heading hold
submode does not operate but the attitude hold submode does.
The roll CWS approach mode occurs when any of these
conditions are present:
* The F/D is in LOC engaged mode and the A/P is in CWS
* VOR engaged below 250 knots and A/P in CWS
* Gear is down below 1500 feet and A/P is in CWS or in CMD
with no modes selected.
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General
The flight crew can use the VOR LOC mode selector switch on
the MCP to select a localizer only approach. The flight crew
uses the localizer only approach when glideslope is not
available or when they use a different vertical path for descent.
An ILS frequency must be set into the navigation control panel
and the ILS course set on the MCP.
The flight crew can use another roll mode to fly the airplane to
the localizer. In this example, the flight crew uses the heading
select mode.
The LOC mode has these three submodes:
* Localizer arm
* Localizer capture
* Localizer on course.
Localizer Arm
The LOC mode arms when these conditions are valid:
* The crew selects an ILS frequency
* A/P is engaged in roll CWS, HDG SEL or LNAV mode
* The crew pushes the VOR LOC mode selector switch.
The VOR LOC mode selector switch on the MCP arms only the
localizer mode. The CDS shows VOR/LOC in white letters. The
VOR LOC mode switch light comes on.
Localizer Capture
The FCC determines the capture point of the localizer beam
from this data:
* Airplane track angle
* Airplane speed
* Localizer deviation
* ILS course error
* Airplane distance to runway.
When the airplane reaches the capture point, the active roll
mode changes to VOR/LOC. The FMA shows VOR/LOC in green
letters. When in the VOR capture mode, the bank angle limit is
30 degrees and the roll rate limit is 7 degrees per second.
Localizer On Course
Localizer on course occurs when these conditions are valid:
* Localizer deviation is less than 0.8 degrees
* Beam rate is less than 0.045 degrees/second
* Bank angle is less than 6 degrees.
Localizer on course also occurs for these conditions:
* The localizer was in the capture mode for more than 135
seconds
* The localizer deviation is less than 0.8 degrees.
The FCC starts to make crosswind corrections.
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General
To select the glideslope as the approach pitch mode, the crew
must push the APP mode selector switch. These are the
glideslope submodes:
* Glideslope arm
* Glideslope capture.
Glideslope Arm
The glideslope mode arms when these conditions are valid:
* The crew selects an ILS frequency
　
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