Garmin G1000 Manual page 529

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 1 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 7-13).
190-00709-05 Rev. D
GPS is Selected Enroute
Navigation Phase of
Source Flight
Figure 7-13 Vertical Path Capture
Garmin G1000 Pilot's Guide for the Socata TBM 850/900
AUTOMATIC FLIGHT CONTROL SYSTEM
Vertical Path Tracking
Altitude Hold Armed, (Flashing Indicates
Mode Active Acknowledgment Required)
Vertical
Deviation
Indicator
VNV Target
Altitude
Required
Vertical
Speed Bug
515