Cockpit Reference Guide

Garmin G1000 Cockpit Reference Guide for the Cessna Nav III
190-00384-11 Rev. A
SECTION 6 – AUTOMATIC
FLIGHT CONTROL
6-12
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.
Figure 6-12 Vertical Path Tracking Mode
Command Bars Indicate Descent to
Maintain Required Vertical Speed
VNV Target
Altitude
Vertical
Deviation
Indicator
Required
Vertical
Speed
Indication
Terminal
Phase of
Flight
GPS is
Selected
Navigation
Source
VNV Target Altitude
Capture Armed
Vertical Path
Tracking Active
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
• Cannotbecomputedforalegtype(suchasahold
or procedure turn)
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