Garmin G1000 NXi Pilot’s Guide for the Cessna NAV III
190-02177-02 Rev. A
381
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
Figure 7-14 Vertical Path Tracking Armed Annunciations
Prior to descent path interception, the Selected Altitude must be set below the current aircraft altitude
by at least 75 feet. For the flight director to transition from Altitude Hold to Vertical Path Tracking Mode,
acknowledgment is required within five minutes of descent path interception by:
Pressing the
VNV
Key.
Adjusting the Selected Altitude.
If acknowledgment is not received within one minute of descent path interception, the white ‘VPTH’
annunciation starts to flash. Flashing continues until acknowledged or the descent path is intercepted. If
the descent is not confirmed by the time of interception, Vertical Path Tracking Mode remains armed and
the descent is not captured.
In conjunction with the “TOD [top of descent] within 1 minute” annunciation in the PFD Navigation
Status Box and the “Vertical track” voice message, VNV indications (VNV Target Altitude, vertical deviation,
and vertical speed required) appear on the PFDs in magenta.
Figure 7-15 Vertical Path Capture
GPS is Selected
Navigation
Source
Enroute
Phase of
Flight
Required
Vertical
Speed Bug
VNV Target
Altitude
Vertical
Deviation
Indicator
Selected
Altitude
Vertical Path Tracking
Armed (Flashing Indicates
Acknowledgment Required
Altitude Hold
Mode Active