Garmin G1000 NXi Pilot's Manual page 375

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
C
hangIng The
If the navigation source is VOR or localizer or OBS Mode has been enabled when using GPS, the Selected
Course is controlled using the CRS Knob corresponding to the selected flight director (CRS1 for the pilot
side, CRS2 for the copilot side).
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.
GLIDEPATH MODE (GP) (SBAS ONLY)
Pressing the CWS Switch while Glidepath Mode is active does not cancel the mode. The autopilot
NOTE:
guides the aircraft back to the glidepath upon release of the CWS Switch.
Glidepath Mode is available only when SBAS is available. Glidepath Mode is used to track the SBAS-based
glidepath. When Glidepath Mode is armed, 'GP' is annunciated in white in the AFCS Status Box.
Selecting Glidepath Mode (SBAS Only):
1) Ensure a GPS approach with vertical guidance or vertical descent angle (LPV, LNAV/VNAV, LNAV +V) 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.
Some RNAV (GPS) approaches provide a vertical descent angle as an aid in flying a stabilized
NOTE:
approach. These approaches are NOT considered Approaches with Vertical Guidance (APV). Approaches
that are annunciated on the HSI as LNAV or LNAV+V should be flown to an MDA, until visual with the
landing surface, even though vertical glidepath (GP) information may be provided.
When flying an LNAV approach (with vertical descent angle) with the autopilot coupled, the
WARNING:
aircraft will not level off at the MDA even if the MDA is set in the altitude preselect.
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Garmin G1000 NXi Pilot's Guide for the Cessna Nav III
AUTOMATIC FLIGHT CONTROL SYSTEM
361