Cockpit Reference Guide

Garmin G1000 Cockpit Reference Guide for the Cessna Nav III
190-00384-08 Rev. A
SECTION 6 – AUTOMATIC
FLIGHT CONTROL
6-13
VNAV flight control is selected. If the VS or FLC Key
is pressed while Vertical Path Tracking Mode is selected,
Vertical Path Tracking Mode reverts to armed along with
the appropriate altitude capture mode to allow profile re-
capture.
Figure 6-13 Flight Level Change VNAV Non-Path Descent
To prevent immediate profile re-capture, the following
must be satisfied:
• At least ten seconds have passed since the non-path
transition was initiated
• Vertical deviation from the profile has exceeded 250
ft, but is now less than 200 ft
Pressing the
VNV Key twice re-arms Vertical Path
Tracking for immediate profile re-capture.
VNAV Target Altitude Capture Mode (ALTV)
NOTE: Armed VNAV Target Altitude and Selected
Altitude capture modes are mutually exclusive.
However, Selected Altitude Capture Mode is
armed implicitly (not annunciated) whenever
VNAV Target Altitude Capture Mode is armed.
This ensures the Selected Altitude is not violated
during a change from VNAV Target Altitude
Capture to Selected Altitude Capture Mode close
to Selected Altitude interception.
VNAV Target Altitude Capture is analogous to Selected
Altitude Capture Mode and is armed automatically
after the VNV Key is pressed and the next VNAV Target
Altitude is to be intercepted before the Selected Altitude.
The annunciation ‘ALTV’ indicates that the VNAV Target
Altitude is to be captured. VNAV Target Altitudes are
shown in the active flight plan or vertical direct-to, and
can be entered manually or loaded from a database (see
the Navigation section for details). At the same time as
“TOD within 1 minute” is annunciated in the Navigation
Data Box, the VNAV Target Altitude is displayed above the
Vertical Speed Indicator (see Figure 6-12). VNAV Target
Altitudes can be modified until VNAV Target Altitude
Capture Mode becomes active.
As the aircraft nears the VNAV Target Altitude, the
flight director automatically transitions to VNAV Target
Altitude Capture Mode with Altitude Hold Mode armed.
This automatic transition is indicated by the green ‘ALTV’
annunciation flashing for up to ten seconds and the
appearance of the white ‘ALT” annunciation. The VNAV
Target Altitude is shown as the Altitude Reference beside
the ‘ALTV’ annunciation.
At 50 ft from the VNAV Target Altitude, the flight
director automatically transitions from VNAV Target
Altitude Capture to Altitude Hold Mode and tracks the
level leg. As Altitude Hold Mode becomes active, the
white ‘ALT’ annunciation moves to the active pitch mode
field and flashes green for ten seconds to indicate the
automatic transition. The flight director automatically
arms Vertical Path Tracking, allowing upcoming descent
legs to be captured and subsequently tracked.
Flash up to 10 sec, Indicating Automatic Transition
Altitude Reference (In This
Case, Equal To VNAV
Altitude Target)
Figure 6-14 VNAV Altitude Capture
Changing the VNAV Target Altitude
NOTE: Pressing the CWS Button while in VNAV
Target Altitude Capture Mode does not cancel
the mode.