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Flight Management System (FMS) for the Agusta AW139/AB139 Helicopter
FROM Waypoint -- The FROM waypoint is the first waypoint on the
D
first page of the flight plan. The FROM waypoint is displayed in
amber. Before takeoff, the FROM waypoint is normally the selected
origin airport or runway. Under normal flight conditions, the FROM
waypoint is the last waypoint sequenced and actual time passing is
displayed. In flight, the FROM waypoint is permitted to be changed.
Since changing the FROM waypoint impacts the current active leg
and can result in an aircraft maneuver, a confirmation step is
included.
TO Waypoint -- The TO waypoint is the second waypoint on the first
D
page of the flight plan. The TO waypoint is displayed in magenta.
The TO waypoint is the waypoint steering the aircraft along a course
defined between the FROM and TO waypoints. When the leg
sequences, the TO waypoint becomes the FROM waypoint. The TO
waypoint is permitted to be changed. Since changing the TO
waypoint impacts the current active leg and can result in an aircraft
maneuver, a confirmation step is included.
Leg Sequencing -- During flight, the active flight plan automatically
D
sequences so the first leg of the active flight plan is the active leg
referenced to the guidance parameters. Normally, the FMS
sequences before the waypoint for an inside turn when the aircraft
is on or close to on course. When the aircraft is not on course, the
normal sequence occurs no later than a point abeam of the
waypoint. Some waypoints have unique sequence criteria. For
example, a holding fix is a flyover waypoint. The holding fix must be
overflown before entering or exiting holding. Some waypoints in SID
and STAR procedures also have unique sequence criteria. The FMS
is programmed to automatically comply with these requirements.
There are situations where the sequence criteria cannot be satisfied
by the FMS. Under these conditions, the pilot must conduct the
sequence manually to aid the FMS. The pilot is required to modify
the active flight plan and can consist of one of the following:
— The FROM waypoint is permitted to be changed to force a
sequence. Line select the waypoint to be sequenced into the
scratchpad changes the FROM waypoint. Then, make the
waypoint the FROM waypoint on the ACTIVE FLT PLAN page
by selecting 1L. The FMS can then look through the flight plan
to find the same waypoint. All waypoints between are deleted
from the ACTIVE FLT PLAN. Leg definitions contained in the
flight plan are preserved using the described method.
A28- - 1146- - 181
REV 3 Mar 2009
Honeywell International Inc. Do not copy without express permission of Honeywell.
Flight Plan
7-5
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