Avidyne IFD540 Manual de Instalação descarregar pdf (Página 56)

2-18 FMS Pages

ENROUTE DESCENTS

A green circular top of descent (TOD) marker and label is drawn

on the map when flying “on-path” along the FMS flight plan, giving

a clear visual cue when it is appropriate to begin the enroute

descent. It is based on the vertical constraint associated with a

down-path waypoint.

To generate the TOD feature:

There must be an altitude constraint defined on at least one

down-path waypoint at least 50’ below present altitude;

There must be a valid GPS MSL Altitude or Baro Altitude;

The aircraft is less than 2nm from the active leg centerline;

Aircraft course is within 45 degrees of Desired Track (DTK).

The TOD function is not available on any waypoint of an

approach past the Final Approach Fix (FAF), or in holds, or

procedures turns.

The FMS uses a default of 500 feet per minute descent rate (or

as edited in the “Preferred Descent Rate” field on the FMS Setup

page).

There is an associated tone (sounds like a door bell) and CAS

countdown message 10 seconds prior to reaching the TOD point.

The “TOD” label may be auto-decluttered from the map

depending on map range and feature density. The TOD depiction

and CAS message are removed from the map immediately after

passing the TOD point.

Top of Descent (TOD) Marker

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Avidyne IFD540 Manual de Instalação Página 56