Avidyne IFD410 FMS/GPS, Руководство пилота

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IFD400 Series Pilot Guide
Navigation 5-37
When a target vertical speed is specified, the IFD will compute
the TOD point using current groundspeed and the desired
descent rate. However, when the aircraft reaches the TOD point
and enroute VNAV is allowed, the IFD will compute the angle
required to reach the desired altitude, then commence with
enroute VNAV using that angle.
Setup Page Descent Rate Selection
VERTICAL DIRECT-TO
Vertical direct-to provides a means to immediately start a descent
to the altitude target associated with a specific flight plan leg. The
IFD will compute the descent angle required to reach the selected
altitude target and immediately commence enroute VNAV using
that angle.
Vertical direct-to is commanded using an LSK on the FMS FPL
page. When the cursor is moved onto any of the altitude
constraint fields on a leg (offset, kind, or altitude) and vertical
direct-to is allowed, then the LSK showing a vertical direct-to
symbol will appear.
Vertical direct-to is allowed only under the following conditions:

Enroute VNAV is allowed

No discontinuities exist between the active leg and the
selected leg

The selected leg does not terminate at or beyond the
FAF on an approach

The selected leg is not defined by a heading