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* The airplane captures and holds the heading set on the MCP.
Deselect HDG SEL
You deselect HDG SEL when you select another roll mode. You
can also deselect HDG SEL if you push the HDG SEL mode
selector switch when the switch light is on.
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General
The VOR mode supplies automatic beam capture and guidance
through the on-course and over-station-sensor phases for
cruise and approach control.
To use the VOR mode, the VOR receiver must be set to the VOR
frequency. The pilot uses one of the course selectors on the
MCP to select the desired course. The course shows on the
course display. The bank angle limit is also set on the MCP.
Push the VOR LOC mode selector switch to select the VOR
mode. If the VOR mode engages, the VOR LOC mode selector
switch lights to show it can also be deselected.
These are the four submodes of the VOR mode:
* Arm
* Capture
* On-course (OC)
* Over-station-sensor (OSS).
Arm Submode
When you push the VOR LOC mode selector switch, the mode is
the VOR arm submode. When the VOR is in the arm submode,
VOR/LOC shows in small white letters on the second line of the
roll position of the FMA. The FCC stays in this submode until the
airplane satisfies the capture logic.
In this submode, the FCC uses this data to calculate the capture
point which is where the airplane should start the turn to be on
course:
* Beam deviation
* True airspeed
* Course error
* Selected bank angle limit
* Closure rate.
The FCC uses this data to calculate the closure rate:
* True airspeed
* Course error
* DME distance.
If DME distance is not available, the FCC uses the rate of
change of the beam deviation to calculate the closure rate.
Capture Submode
When the airplane reaches the capture point, the VOR mode
changes to the capture submode. The FCC makes sure that
these conditions are valid for at least 3 seconds before the
capture mode is active:
* VOR LOC mode selector switch is engaged
* Course selector was not moved
* Beam deviation is less than 22 degrees
* VOR receiver is valid.
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If the FCC could not calculate the capture point, but the beam
deviation is less than 0.5 degrees, the VOR mode changes to
the capture submode. Also if the FCC could not calculate the
capture point, but the beam deviation is less than 2 degrees for
10 seconds, the VOR mode changes to the capture submode.
The airplane will not bank more than the selected bank angle
limit. The maximum roll rate is 4.0 degrees per second.
When the VOR is in the capture submode, VOR/LOC shows in
large green letters on the first line of the roll position of the
FMA. The FCC stays in this submode until the airplane satisfies
the on-course logic.
On-Course Submode
These conditions inhibit the on-course submode:
* VOR not in the capture submode
* Bank angle is more than 7 degrees
* The over-station-sensor (OSS) is in effect.
The VOR on-course submode is active when these conditions
occur for at least 5 seconds:
* Beam deviation is less than 1 degree
* Course error is less than 18 degrees.
The VOR on-course submode is also active when the deviation
beam rate of change is less than 0.15 degrees per second for at
least 10 seconds.
The airplane will not bank more than 8 degrees. The maximum
roll rate is 1.3 degrees per second.
When the VOR is in the on-course submode, VOR/LOC shows in
large green letters on the first line of the roll position of the
FMA. The FCC stays in this submode until the airplane satisfies
the OSS logic.
If the crew selects a new VOR course while in the on-course
submode, the FCC goes back to the VOR capture submode.
Over-Station-Sensor Submode
The OSS logic monitors the VOR deviation beam signal for
　
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