Garmin G1000 NXi Pilot's Manual page 369

VERTICAL NAVIGATION MODES (VPTH, ALTV)
VNV is disabled when parallel track or Dead Reckoning Mode is active.
NOTE:
The Selected Altitude takes precedence over any other vertical constraints.
NOTE:
Vertical Navigation (VNV) flight control is available for enroute/terminal cruise and descent operations any
time that VNV flight planning is available. Refer to the Flight Management Section for more information on
VNV 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 loaded
from the database) at waypoints in the active flight plan or vertical direct-to. The appropriate VNV flight
control modes are sequenced by the flight director to follow the path defined by the vertical profile. Upon
reaching the last waypoint in the VNV flight plan, the flight director transitions to Altitude Hold Mode and
cancels any armed VNV modes.
v P
erTICal aTh
Vertical Path Tracking Mode is only applicable to aircraft equipped with a VNV Key.
NOTE:
If another vertical mode key is pressed while Vertical Path Tracking Mode is selected, Vertical Path
NOTE:
Tracking Mode reverts to armed.
Pressing the CWS Switch while Vertical Path Tracking Mode is active does not cancel the mode. The
NOTE:
autopilot 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 Tracking
Mode is armed in preparation for descent path capture. 'VPTH' (or '/V' when Glidepath or Glideslope
Mode is concurrently armed) is annunciated in white in addition to previously armed modes. If applicable,
the appropriate altitude capture mode is armed for capture of the next VNV Target Altitude (ALTV) or the
Selected Altitude (ALTS), whichever is greater.
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T M (vPTh)
raCkIng oDe
Figure 7-14 Vertical Path Tracking Armed Annunciations
Garmin G1000 NXi Pilot's Guide for the Cessna Nav III
AUTOMATIC FLIGHT CONTROL SYSTEM
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