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Garmin G1000 Cockpit Reference Guide for the Socata TBM 850
190-00708-00 Rev. A
SECTION 6 – AUTOMATIC
FLIGHT CONTROL
6-11
Pressing the VNV Key
Adjusting the Selected Altitude
If acknowledgment is not received within 1 minute of
descent path interception, the white ‘VPTH’ annunciation
and the
VNV Key annunciator light start 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 6-12).
When a descent leg is captured (i.e., vertical deviation
becomes valid), Vertical Path Tracking becomes active
and tracks the descent profile (Figure 6-13). An altitude
capture mode (‘ALTS’ or ‘ALTV’) is armed as appropriate.
Figure 6-12 Vertical Path Capture
Vertical Path Tracking Armed, (Flashing
Indicates Acknowledgment Required
Altitude Hold Mode Active
VNV Target
Altitude
Vertical Deviation
Indicator
Required Vertical
Speed Bug
GPS is Selected
Navigation Source
Enroute Phase of
Flight
Selected Altitude Below
VNV Target
If the Altimeter’s barometric setting is adjusted
while Vertical Path Tracking is active, the flight director
increases/decreases the descent rate by up to 500 fpm
to re-establish the aircraft on the descent path (without
commanding a climb). Adjusting the altimeter barometric
setting creates discontinuities in VNV vertical deviation,
moving the descent path.
For large adjustments, it may take several minutes
for the aircraft to re-establish on the descent path. If the
change is made while nearing a waypoint with a VNV
Target Altitude, the aircraft may not re-establish on the
descent path in time to meet the vertical constraint.
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