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Flight Management System (FMS) for the Agusta AW139/AB139 Helicopter
— A direct--to is permitted to be conducted to the desired TO
waypoint.All the waypoints prior to the waypoint are deleted and
the FMS creates a direct leg to the waypoint. This results in a new
path to the waypoint that is different than the previous path
contained in the flight plan.
Some leg sequences indicate the turning direction to the new leg by
displaying an L or an R in reverse video. This notation is used when
either the turn direction is indicated (by a SID, STAR, or approach)
or the new leg requires a large turn (near 180_) to track the new
course.
When the destination waypoint is sequenced, the destination
waypoint is retained by the FMS as the TO waypoint. Bearing,
distance, and required track to the destination waypoint continue to
be computed and displayed.
Discontinuities -- A discontinuity can exist in the flight plan. A
D
discontinuity is a segment in the flight plan with no lateral flight plan
definition. However, a lateral definition must be before and after a
discontinuity.
When changing, discontinuities in the flight plan are kept to the
minimum. There are times when a discontinuity is necessary. The
following rules apply:
— When adding or deleting a single waypoint, no discontinuity is
permitted to be inserted in the flight plan. The flight plan is directly
linked between the waypoints. Deleting several waypoints at a
time does not result in a discontinuity.
— When linking flight plans or inserting a procedure, no
discontinuity can exist when a common waypoint is used.
Without a common waypoint, the inserted flight plan or
procedure is linked at the point of insertion with a discontinuity
at the end. For example, when the last waypoint of a SID is also
a waypoint in the flight plan, the flight plan and procedure are
linked at that waypoint with no discontinuity. When the last
waypoint of a SID is not in the flight plan, there is a discontinuity
between the SID and the flight plan. Some procedures have
embedded discontinuities inserted along with the procedure.
— A SID can only be replaced with another procedure and cannot
be deleted. The linked portions of an arrival are deleted using the
ARRIVAL page. In both cases, the discontinuity depends on the
changed procedure. Linked flight plans or procedures are
deleted under the same operation for deleting waypoints. This
operation does not result in discontinuity.
Flight Plan
7-6
Honeywell International Inc. Do not copy without express permission of Honeywell.
A28- - 1146- - 181
REV 3 Mar 2009
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