G1000 Reference Guide - SkyHoppers

SECTION 6 – AUTOMATICFLIGHT CONTROLVertical Path Tracking descent to VNVTarget Altitude:1) Select VNV flight control:a) Press the VNV Key to arm Vertical PathTracking Mode. The white annunciation ‘VPTH’appears.b) Using the ALT Knob, set the Selected Altitudeat least 75 feet below the VNV Target Altitudeof 10,000 feet.c) If Vertical Path Tracking Mode is armed morethan 5 minutes prior to descent path capture,acknowledgment is required for the flightdirector to transition from Altitude Hold toVertical Path Tracking Mode. To proceedwith descent path capture if the white ‘VPTH’annunciation begins flashing, do one of thefollowing:• Press the VNV Key• Turn the ALT Knob to adjust the SelectedAltitudeIf the descent is not confirmed by the time ofinterception, Vertical Path Tracking Mode remainsarmed and the descent is not captured.2) When the top of descent (TOD) is reached, theflight director transitions to Vertical Path TrackingMode and begins the descent to the VNVTarget Altitude. Intention to capture the VNVTarget Altitude is indicated by the white ‘ALTV’annunciation.3) As the aircraft nears the VNV Target Altitude, theflight director transitions to VNV Target AltitudeCapture Mode, indicated by the green ‘ALTV’annunciation flashing for up to 10 seconds.The green ‘ALT’ annunciation flashes for up to10 seconds upon reaching 50 feet from theVNV Target Altitude; the autopilot transitions toAltitude Hold Mode and levels the aircraft at thevertical waypoint.1ALT ModeTOD2Cruise Altitude of 12,000 MSLVPTH Mode3VNAV Target Altitude of 10,000 MSLBODALT ModeSelected Altitude (set below VNAV Target Altitude)3 nmOPSHN190-00384-07 Rev. AFigure 6-35 VPTH DescentGarmin G1000 Cockpit Reference Guide for the Cessna Nav III6-29