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Operations
7.
If the displayed default reference is not the desired
one for the DME Arc, press SEL and use the Large
and Small knobs to select the correct reference
waypoint. Use this page and your aircraft heading to
fly the arc.
8.
NAV
When intercepting and flying DME-ARCs, autopilots
may be used only in the heading mode. Autopilots may
be used to capture the course you select to intercept.
Other Uses for the Arc Assist Function
You can select the reference waypoint for the Arc Assist feature and it
can be used at any time, not just during approach or terminal
operations. This allows the Arc Assist feature to be used for a variety of
uses other than flying DME arcs to intercept an approach course. It can
of course be used to navigate DME arcs that are part of a published
missed approach procedure. It can also be used for difficult operations
such as conducting an over water search. By establishing a user
waypoint at the center of such a search area and selecting that waypoint
as a DME Arc reference point, you can fly circles about that waypoint
at known distances. By gradually increasing the arc distance each time
you pass a specific radial, you can expand the search area. Looking for
something on the water or over featureless terrain is usually quite a
challenge, especially when the winds are variable. The Arc Assist
feature of the Apollo NMS can make this much easier.
Press ENT to choose the displayed
default reference point. In this case, the
OED VOR.
Note
After you intercept your inbound leg,
i.e. your CDI begins to center. Press
NAV to return to NAV Mode.
Reactivate flight plan leg sequencing
by pressing the OBS/HLD button.
Note
Approach Procedures
253
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