Garmin G1000 Reference Manual page 85

c) If Vertical Path Tracking Mode is armed more
than five minutes prior to descent path
capture, acknowledgment is required for the
flight director to transition from Altitude Hold
to Vertical Path Tracking Mode. To proceed
with descent path capture if the white 'VPTH'
annunciation begins flashing,
Press the VNV Key
OR:
Turn the ALT Knob to adjust the Selected
Altitude
If the descent is not confirmed by the
time of interception, Vertical Path Tracking
Mode remains armed and the descent is not
captured.
2) When the top-of-descent (TOD) is reached, the
flight director transitions to Vertical Path Tracking
Mode and begins the descent to the VNAV
Target Altitude. Intention to capture the VNAV
Target Altitude is indicated by the white 'ALTV'
annunciation.
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Figure 6-35 VPTH Descent
Garmin G1000 Cockpit Reference Guide for the Cessna Nav III
3) As the aircraft nears the VNAV Target Altitude, the
flight director transitions to VNAV Target Altitude
Capture Mode, indicated by the green 'ALTV'
annunciation flashing for up to ten seconds.
The green 'ALT' annunciation flashes for up
to ten seconds upon reaching 50 ft from the
VNAV Target Altitude; the autopilot transitions
to Altitude Hold Mode and levels the aircraft at
the vertical waypoint.
Non-path descents can be flown while under VNAV
guidance using Pitch Hold, Vertical Speed, or Flight Level
Change Mode. Flight Level Change Mode is used for this
example.
Non-path descent:
1) Command a non-path descent using Flight Level
Change Mode:
a) Using the ALT Knob, set the Selected Altitude
below the current aircraft altitude to 5,000
ft.
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SECTION 6 – AUTOMATIC
FLIGHT CONTROL
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