The KLN 90B does not take into account
the geometry of the active flight plan when
determining the arc intercept point. This
point is defined solely on the present radial
and the defined arc distance from the
reference VOR. For this reason, it is better
to delay selecting approaches that contain
DME arcs until the aircraft is closer to the
If the present radial from the reference
VOR is outside of the defined arc, the KLN
90B will default to the beginning of the arc.
(3) The KLN 90B recognizes if this point is
associated with a DME arc. Once the arc waypoint is
chosen, the KLN 90B determines on what radial of the
reference VOR is presently located. A waypoint is
created that is located at the intersection of the
present radial and the DME arc. This waypoint is the
first waypoint in the list of waypoints presented on the
APT 8 page before loading the approach into the flight
plan. This waypoint is named in the same convention
(4) With the cursor over LOAD IN FPL, press
the ENT button. The approach will be loaded into the
active flight plan.
(5) After the approach is loaded into the flight
"REDUNDANT WPTS IN FPL - EDIT EN ROUTE
WPTS AS NECESSARY."
Examine the flight plan and, if practical, observe
the Super NAV 5 page to make sure that the sequence
of waypoints does not have any unnecessary legs in it.
(6) The KLN 90B will now provide guidance
to the arc intercept point. The Super NAV 5 page
displays the entire arc on the screen. Refer to Figure
3-70. The portion between the beginning of the arc
and the arc intercept is drawn with a dashed line. The
part that is between the arc intercept point and the end
of the arc is drawn with the normal solid line.
Figure 3-70. DME ARC
(7) In some cases, ATC may provide radar
vectors to the arc. The KLN 90B provides a means to
define a new intercept point based on the current track
of the aircraft over the ground. This can be done from
either the Super NAV 5 page or from the FPL 0 page.
The dashed line on the Super NAV 5 page will help in
determining if the ATC vectors are correct.
1. From the Super NAV 5 page, pull out
the right inner knob to bring up the
2. Turn the right inner knob until the first
waypoint of the arc is displayed. For
approaches, this will have an "i"
appended to the waypoint name. If
the recalculation is to be done from
the FPL 0 page, turn on the left cursor
and move if over the first waypoint of
3. From either page press the clear
button. This will change the waypoint
to read MOVE?. Refer to Figure 3-71.
If it is desired to re-compute the arc
intercept point, press the ENT button.
If a new arc intercept point is not
desired, press the clear button again.
Figure 3-71. DME ARC MOVE?