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190-00498-07 Rev. A
Garmin G1000 Pilot’s Guide for Cessna Nav III
443
AUTOMATIC FLIGHT CONTROL SYSTEM
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICES INDEX
Priortodescentpathinterception,the SelectedAltitudemustbesetbelowthe current aircraftaltitude
byatleast75feet.FortheightdirectortotransitionfromAltitudeHoldtoVerticalPathTrackingMode,
acknowledgmentisrequiredwithin5minutesofdescentpathinterceptionby:
•PressingtheVNV Key
•AdjustingtheSelectedAltitude
If acknowledgment is not received within 1 minute of descent path interception, the white ‘VPTH’
annunciationstartstoash.Flashingcontinuesuntilacknowledgedorthedescentpathisintercepted.If
thedescentisnotconrmedbythetimeofinterception,VerticalPathTrackingModeremainsarmedandthe
descent is not captured.
Inconjunctionwiththe“TOD[topofdescent]within1minute”annunciationintheNavigationStatusBox
andthe“VerticalTrack”voicemessage,VNVindications(VNVTargetAltitude,verticaldeviation,andvertical
speedrequired)appearonthePFDinmagenta(Figure7-11).
Figure 7-11 Vertical Path Capture
VNV Target
Altitude
Selected
Altitude Below
VNV Target
Vertical
Deviation
Indicator
Required
Vertical
Speed Bug
Vertical Path Tracking
Armed, (Flashing Indicates
Acknowledgment Required)
Altitude Hold
Mode Active
Terminal
Phase
of Flight
GPS is
Selected
Navigation
Source