AUTOMATIC FLIGHT CONTROL SYSTEM

APPROACH MODE (GPS, VAPP, LOC)

NOTE: The selected navigation receiver must have a valid VOR or LOC signal or active GPS course for the flight director to enter Approach Mode.

Approach Mode is activated when the APR Key is pressed. Approach Mode acquires and tracks the selected navigation source (GPS, VOR, or LOC), depending on loaded approach. This mode uses the selected navigation receiver deviation and desired course inputs to fly the approach. Pressing the APR Key when the CDI is greater than one dot arms the selected approach mode (annunciated in white to the left of the active lateral mode). If the CDI is less than one dot, the LOC is automatically captured when the APR Key is pressed.

VOR Approach Mode (VAPP) provides greater sensitivity for signal tracking than VOR Navigation Mode .

Selecting VOR Approach Mode:

1)Ensure a valid VOR frequency is tuned.

2)Ensure that VOR is the selected navigation source (use the CDI Softkey to cycle through navigation sources if necessary).

3)Press the APR Key.

When GPS Approach Mode is armed, Glidepath Mode is also armed.

Selecting GPS Approach Mode:

1)Ensure a GPS approach is loaded into the active flight plan. The active waypoint must be part of the flight plan (cannot be a direct-to a waypoint not in the flight plan).

2)Ensure that GPS is the selected navigation source (use the CDI Softkey to cycle through navigation sources if necessary).

3)Press the APR Key.

Figure 7-24 Navigation/Approach Mode Armed

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AUTOMATIC FLIGHT CONTROL SYSTEM

LOC Approach Mode allows the autopilot to fly a LOC/ILS approach with a glideslope. When LOC Approach Mode is armed, Glideslope Mode is also armed automatically. LOC captures are inhibited if the difference between aircraft heading and localizer course exceeds 105°.

Selecting LOC Approach Mode:

1)Ensure a valid localizer frequency is tuned.

2)Ensure that LOC is the selected navigation source (use the CDI Softkey to cycle through navigation sources if necessary).

3)Press the APR Key.

Or:

1)Ensure that GPS is the selected navigation source (use the CDI Softkey to cycle through navigation sources if necessary).

2)Ensure a LOC/ILS approach is loaded into the active flight plan.

3)Ensure the corresponding LOC frequency is tuned.

4)Press the APR Key.

If the following occurs, the flight director reverts to Roll Hold Mode (wings rolled level):

•Approach Mode is active and a Vectors-To-Final is activated

•Approach Mode is active and Navigation source is manually switched

•During a LOC/ILS Approach GPS Navigation Mode is active and the FAF is crossed after the automatic navigation source switch from GPS to LOC

CHANGING THE SELECTED COURSE

The Selected Course is controlled using the CRS Knob (while in VOR, LOC, or OBS Mode). Pressing the CWS Button and hand-flying the aircraft does not change the Selected Course while in Approach Mode. The autopilot guides the aircraft back to the Selected Course (or GPS flight plan) when the CWS Button is released.

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AUTOMATIC FLIGHT CONTROL SYSTEM

BACKCOURSE MODE (BC)

NOTE: When making a backcourse approach, set the Selected Course to the localizer front course.

Backcourse Mode captures and tracks a localizer signal in the backcourse direction. The mode may be selected by pressing the BC Key. Backcourse Mode is armed if the CDI is greater than one dot when the mode is selected. If the CDI is less than one dot, the Backcourse Mode is automatically captured when the BC Key is pressed. The flight director creates roll steering commands from the Selected Course and deviation when in Backcourse Mode.

Backcourse	Pitch Hold
Mode Active	Mode Active

LOC2 is

Selected

Navigation

Source

Figure 7-25 Backcourse Mode

CHANGING THE SELECTED COURSE

The Selected Course is controlled using the CRS Knob. Pressing the CWS Button and hand-flying the aircraft does not reset any reference data while in Backcourse Mode. The autopilot guides the aircraft back to the Selected Course when the CWS Button is released.

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