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190-00498-07 Rev. A
Garmin G1000 Pilot’s Guide for Cessna Nav III
447
AUTOMATIC FLIGHT CONTROL SYSTEM
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICES INDEX
GLIDEPATH MODE (GP) (SBAS ONLY)
NOTE: Pressing the CWS Button while Glidepath Mode is active does not cancel the mode. The autopilot
guides the aircraft back to the glidepath upon release of the CWS Button.
GlidepathModeisavailableonlyininstallationswithGIA63WIAUswhenSBASisavailable.Glidepath
ModeisusedtotracktheSBAS-basedglidepath.WhenGlidepathModeisarmed,‘GP’isannunciatedinwhite
intheAFCSStatusBox.
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.
NOTE: Some RNAV (GPS) approaches provide a vertical descent angle as an aid in flying a stabilized
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.
WARNING: When flying an LNAV approach (with vertical descent angle) with the autopilot coupled, the
aircraft will not level off at the MDA even if the MDA is set in the altitude preselect.
Uponreachingtheglidepath,theightdirectortransitionstoGlidepathModeandbeginstocaptureand
track the glidepath.
Figure 7-15 Glidepath Mode Armed
Once the following conditions have been met, the glidepath can be captured:
•Theactivewaypointisatorafterthenalapproachx(FAF).
•Verticaldeviationisvalid.
•TheCDIisatlessthanfullscaledeviation
•Automaticsequencingofwaypointshasnotbeensuspended(no‘SUSP’annunciationontheHSI)