Garmin G1000 Reference Manual page 75

Non-Path Descents
Pitch Hold, Vertical Speed, and Flight Level Change
modes can also be used to fly non-path descents while 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 VNV 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
190-00384-09 Rev. A Garmin G1000 Cockpit Reference Guide for the Cessna Nav III
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
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.
SECTION 6 – AUTOMATIC
FLIGHT CONTROL
Altitude Reference (In This
Case, Equal To VNAV
Altitude Target)
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