G1000 Reference Guide - SkyHoppers

SECTION 6 – AUTOMATICFLIGHT CONTROLVertical Navigation Modes (VPTH, ALTV)NOTE: Pressing the CWS Button while VerticalPath Tracking Mode is active does not cancelthe mode. The autopilot guides the aircraft backto the descent path upon release of the CWSButton.NOTE: VNAV flight director pitch modes areavailable only in conjunction with GPS rollmodes.When a vertical profile (VNAV flight plan) is active andthe VNV Key is pressed, Vertical Path Tracking Mode isarmed in preparation for descent path capture. ‘VPTH’ (or‘/V’ when Glidepath or Glideslope Mode is concurrentlyarmed) is annunciated in white in addition to previouslyarmed modes. If applicable, the appropriate altitudecapture mode is armed for capture of the next VNAVTarget Altitude (ALTV) or the Selected Altitude (ALTS),whichever is greater.NOTE: The Selected Altitude takes precedenceover any other vertical constraints.Vertical Navigation (VNAV) flight control is availablefor enroute/terminal cruise and descent operations whenVNAV has been enabled and a VNAV flight plan (with atleast one vertical waypoint) or direct-to with a verticalconstraint has been activated. Refer to the GPS NavigationSection for more information on VNAV flight plans. Theflight director may be armed for VNAV at any time, but notarget altitudes are captured during a climb.The Command Bars provide vertical profile guidancebased on specified altitudes (entered manually or loadedfrom the database) at waypoints in the active flight planor vertical direct-to. The appropriate VNAV flight controlmodes are sequenced by the flight director to follow thepath defined by the vertical profile. Upon reaching thelast waypoint in the VNAV flight plan, the flight directortransitions to Altitude Hold Mode and cancels any armedVNAV modes.Vertical Path Tracking Mode (VPTH)Figure 6-10 Vertical Path Tracking Armed AnnunciationsPrior to descent path interception, the Selected Altitudemust be set below the current aircraft altitude by at least75 ft. For the flight director to transition from AltitudeHold to Vertical Path Tracking Mode, acknowledgment isrequired within five minutes of descent path capture by:• Pressing the VNV Key• Adjusting the Selected AltitudeIf acknowledgment is not received within one minute ofdescent path interception, the white ‘VPTH’ annunciationand the VNV Key annunciator light start to flash. Flashingcontinues until acknowledged or the descent path isintercepted. If the descent is not confirmed by the time ofinterception, Vertical Path Tracking Mode remains armedand the descent is not captured.NOTE: If another pitch mode key is pressed whileVertical Path Tracking Mode is selected, VerticalPath Tracking Mode reverts to armed.6-10Garmin G1000 Cockpit Reference Guide for the Cessna Nav III190-00384-07 Rev. A