Garmin G1000 Reference Manual page 74

SECTION 6 – AUTOMATIC
FLIGHT CONTROL
When a descent leg is captured (Figure 6-12), Vertical
Path Tracking becomes active and tracks the descent pro-
file. An altitude capture mode ('ALTS' or 'ALTV') is armed
as appropriate.
GPS is
Selected
Navigation
Source
Automatic Pitch Hold Reversion
Several situations can occur while Vertical Path
Tracking Mode is active which cause the flight director to
revert to Pitch Hold Mode. Vertical Path Tracking and the
appropriate altitude capture modes are armed for possible
descent profile recapture if the vertical deviation:
• Exceeds 200 ft during an overspeed condition
• Experiences a discontinuity exceeding 200 ft due to
a flight plan change
• Becomes invalid due to excessive cross-track error,
track angle error
6-12
Vertical Path
Tracking Active
Command Bars Indicate Descent to
Terminal
Maintain Required Vertical Speed
Phase of
Flight
Figure 6-12 Vertical Path Tracking Mode
Garmin G1000 Cockpit Reference Guide for the Cessna Nav III
• Cannot be computed for a leg type (such as a hold
or procedure turn)
VNV Target Altitude
Capture Armed
Vertical
Deviation
Indicator
The following circumstances cause mode reversion
without arming Vertical Path Tracking Mode:
• Navigation source manually changed from GPS
• CNCL VNV Softkey selected on the Active Flight
Plan Page (MFD)
• All remaining vertical waypoints deleted from the
flight plan
• Displays entering Reversionary Mode
VNV Target
Altitude
Required
Vertical
Speed
Indication
190-00384-09 Rev. A