Garmin G1000 King Air C90GT - Manual (Page 427)

190-00663-01 Rev. A Garmin G1000 Pilot’s Guide for the Beechcraft C90A/GT 413
AUTOMATIC FLIGHT CONTROL SYSTEM
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL
FEA
TURES
APPENDICES
INDEX
VERTICAL 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 any
time that VNV flight planning is available. Refer to the GPS Navigation 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.
VERTICAL PATH TRACKING MODE (VPTH)
NOTE: If another vertical mode key is pressed while Vertical Path Tracking Mode is selected, Vertical Path
Tracking Mode reverts to armed.
NOTE: Pressing the CWS Button while Vertical Path Tracking Mode is active does not cancel the mode. The
autopilot guides the aircraft back to the descent path upon release of the CWS Button.
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.
Figure 7-13 Vertical Path Tracking Armed Annunciations