IFD500 Series Pilot Guide
3-22 FMS Subsystem
done because the FMS only knows that the direct-to is an
interruption of the currently active leg by proceeding direct to the
new waypoint. The FMS does not know the pilot's intent after the
direct-to, so it places the discontinuity afterward. Once the direct-
to is active, the pilot has time to adjust the downpath flight plan to
reflect the remainder of the clearance. That may be as simple as
removing the discontinuity or it may include deleting and inserting
other legs.
Offpath Direct-To (gap inserted)
When the active leg is part of an arrival or an approach and an
offpath direct-to is performed, the direct-to will be inserted after
the end of the missed approach or after the destination if there is
no associated missed approach. When the active leg is part of a
departure and an offpath direct-to is performed, the direct-to will
be inserted after the last leg of the departure.
Onpath Direct-To
An onpath direct-to causes the specified leg to become active,
but the path is temporarily changed to be direct from the aircraft
position at the time the direct-to was initiated. No discontinuity is
inserted. The FMS assumes that the direct-to was just a shortcut
and that the intent is to resume guidance along the existing flight
plan once the end of the direct-to leg is reached.
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