Garmin G1000 Pilot’s Guide for the Beechcraft A36/G36 190-00595-01 Rev. B342AUTOMATIC FLIGHT CONTROL SYSTEMSYSTEMOVERVIEWFLIGHTINSTRUMENTSEISAUDIO PANEL& CNSFLIGHTMANAGEMENTHAZARDAVOIDANCEAFCSADDITIONALFEATURESAPPENDICESINDEXVERTICAL NAVIGATION MODES (VPTH, ALTV)NOTE: VNV is disabled when parallel track or Dead Reckoning Mode is active.NOTE: The Selected Altitude takes precedence over any other vertical constraints.Vertical Navigation (VNV) flight control is available for enroute/terminal cruise and descent operations anytime that VNV flight planning is available. Refer to the Flight Management Section for more information onVNV flight plans. Conditions for availability include, but are not limited to:• The selected navigation source is GPS.• A VNV flight plan (with at least one altitude-constrained waypoint) or vertical direct-to is active.• VNV is enabled (VNV ENBL Softkey pressed on the MFD).• Crosstrack error is valid and within certain limits.• Desired/actual track are valid or track angle error is within certain limits.• The VNV Target Altitude of the active waypoint is no more than 250 ft above the current aircraft altitude.The flight director may be armed for VNV at any time, but no target altitudes are captured during a climb.The Command Bars provide vertical profile guidance based on specified altitudes (entered manually or loadedfrom the database) at waypoints in the active flight plan or vertical direct-to. The appropriate VNV flight controlmodes are sequenced by the flight director to follow the path defined by the vertical profile. Upon reachingthe last waypoint in the VNV flight plan, the flight director transitions to Altitude Hold Mode and cancels anyarmed VNV modes.VERTICAL PATH TRACKING MODE (VPTH)NOTE: If another vertical mode key is pressed while Vertical Path Tracking Mode is selected, Vertical PathTracking Mode reverts to armed.NOTE: Pressing the CWS Switch while Vertical Path Tracking Mode is active does not cancel the mode. Theautopilot guides the aircraft back to the descent path upon release of the CWS Switch.When a vertical profile (VNV flight plan) is active and the VNV Key is pressed, Vertical Path TrackingMode is armed in preparation for descent path capture. ‘VPTH’ (or ‘/V’ when Glidepath or Glideslope Modeis concurrently armed) is annunciated in white in addition to previously armed modes. If applicable, theappropriate altitude capture mode is armed for capture of the next VNV Target Altitude (ALTV) or the SelectedAltitude (ALTS), whichever is greater.Figure 7-10 Vertical Path Tracking Armed Annunciations
