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Operations
DME-ARCs (Arc Assist)
The Apollo NMS provides navigation pages customized for flying
DME arcs. The Arc Assist page shows the identifier and type of
waypoint being used as a reference. The Arc Assist page allows you to
select and change the reference waypoint just as you would any other
waypoint: the distance from that reference waypoint, the radial from
that waypoint, and the desired track at that point on the arc. Actually
there are two Arc Assist pages: one is labeled "Left" and the other
"Right." The only difference is that one shows the desired track for a
left-arc and the other shows the 180 degree opposite desired track for a
right-arc.
1.
NAV
2.
ENT
SEL
3.
The desired track shown on a Arc Assist page is relative to the arc, not
to the flight plan legs. The DME-Arc is always perpendicular to the
present radial and it shows the desired track at the current radial if the
aircraft was on the arc. It is the desired no-wind heading if established
on the arc. If your distance from the reference waypoint is greater or
The Arc Assist page is selected in
navigation mode with the Large knob.
The nearest VOR will display as the
default reference point.
Before you reach the starting waypoint
of a DME Arc, press ENT to accept the
displayed VOR or press SEL and select
the desired waypoint. The selected
waypoint is now used as the center of
the arc.
Turn the Small knob to view the
left-arc or right-arc pages.
Approach Procedures
249
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