Glidepath Mode (Gp) (Sbas Only) - Garmin G900X Pilot's Manual

AUTOMATIC FLIGHT CONTROL SYSTEM

GLIDEPATH MODE (GP) (SBAS ONLY)

Refer to the Aircraft Flight Manual (AFM) to determine whether SBAS functionality is approved.
NOTE:
Pressing the CWS Button 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 Button.
Glidepath Mode is available only in installations with GIA 63W IAUs 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:
1) Ensure a GPS approach with vertical guidance (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).
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 are considered Nonprecision Approaches (NPA) and
are flown to an MDA 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.
Upon reaching the glidepath, the flight director transitions to Glidepath Mode and begins to capture and
track the glidepath.
Once the following conditions have been met, the glidepath can be captured:
• The active waypoint is at or after the final approach fix (FAF)
• Vertical deviation is valid
• The CDI is at less than full scale deviation
• Automatic sequencing of waypoints has not been suspended (no 'SUSP' annunciation on the HSI)
506
Figure 7-15 Glidepath Mode Armed
Garmin G900X Pilot's Guide 190-00726-00 Rev. J