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Flight Management System (FMS) for the Agusta AW139/AB139 Helicopter
DIRECT- - TO
The FMS direct--to function is either lateral or vertical. The left line
select keys are used for lateral direct--to and the right line select keys
are used for vertical direct--to. The FMS also has a direct--to recovery
function.
Lateral Direct- -To -- There are two ways to operate the lateral
D
direct--to after the DIR key is selected:
— When the direct--to waypoint is in the flight plan, pushing the line
select key next to the direct--to waypoint engages the direct--to.
A direct--to course is calculated and the aircraft begins turning to
the waypoint.
— Enter the direct--to waypoint into the scratchpad and line select
the waypoint to the dashed lines (1L on page 1). This completes
the direct--to. This method is required when the direct--to
waypoint is not already in the flight plan and is an option for
waypoints in the flight plan.
Vertical Direct- -To -- A vertical direct--to is operated in a similar
D
manner as the lateral direct--to. A vertical direct--to is executed to an
altitude constraint at a waypoint in the flight plan. The altitude
constraint must be in the flight plan before the vertical direct--to is
executed. Procedure 9--1 describes how to execute a vertical direct--to.
NOTE:
The aircraft does not respond to the vertical direct--to
since vertical navigation (VNAV) is advisory only.
Step
Procedure 9- -1 Vertical Direct- -To
1
Set the altitude selector to the cleared altitude.
2
Confirm that the altitude constraint is entered in the flight
plan.
3
Push the DIR key.
4
Using the right--hand line selects (1R through 5R), push
the line select adjacent to the altitude constraint.
When conducting a vertical direct--to for descent, VNAV calculates
the angle from present position to the altitude constraint. The
top--of--descent (TOD) is placed slightly ahead of the aircraft to
achieve a smooth descent transition. The calculated angle becomes
the path angle for the descent. The calculated angle is limited
between 1_ and 6_. When the actual angle is less than 1_ or greater
than 6_, the FMS begins a descent to intercept the limiting angle of
1_ or 6_.
Direct/Intercept
9-2
Honeywell International Inc. Do not copy without express permission of Honeywell.
A28- - 1146- - 181
REV 3 Mar 2009
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