BendixKing KLN 89B - Pilots Guide - Manual (Page 181)

5.1.8. EXAMPLE APPROACH: DME ARC
DME arc procedures with the KLN 89B are completely different from
using traditional VOR and DME equipment. Don’t worry though
because DME arc procedures using the KLN 89B are also easier
than using traditional equipment. This is because the KLN 89B pro-
vides left/right guidance around the arc. No more having to watch
distance in one place and radial in another!
When being vectored, a DME arc is really a whole bunch of initial
approach fixes placed one next to each other to form an arc. Very
rarely do you actually fly to the beginning of an arc, especially in a
radar environment. Instead, the flight path of the aircraft generally
intersects the arc at some point. Once the aircraft is near the arc, it is
then possible to turn so that the arc distance is maintained until time
to turn to the inbound fix.
The following example will show how DME arc procedures are flown
using the KLN 89B. This example approach will be to use the VOR
RWY 12 approach to Owatonna, Minnesota, KOWA. The approach
plate for this approach is in figure 5-22. Assume that the aircraft is
approaching from the North and is in a radar environment.
1. ATC assigns the VOR RWY 12
approach. Turn to the APT 8
page for KOWA to select the
approach. You select the VOR 12
approach and the KLN 89B pre-
sents the IAF selection page
(figure 5-21).
2. There are five choices for the IAF. Three of these choices you
can recognize but the other two, D040L and D220L, are unfamil-
iar and not shown on this chart. These two waypoints are the
data base identifiers for the ends of the arc. D040L means DME
arc point, 040 is the radial on which the waypoint lies, and L indi-
cates the distance of the arc. L is the twelfth letter of the alphabet
so the L indicates that this is a 12 DME arc. In a similar manner
D220L can also be decoded. In this example the aircraft is
approaching from the north so the D040L IAF will be selected.
3. The KLN 89B knows that this point is associated with a DME arc.
Once an arc waypoint is chosen, the KLN 89B determines what
radial of the reference VOR the aircraft is presently located on. A
waypoint is created that is located at the intersection of the pre-
sent radial and the DME arc. This waypoint is the first waypoint in
the list of waypoints presented on the APT 8 page before loading
Approaches and SID/STARs
5-22
Approaches and SID/STARs
Chapter 5
APT VOR NDB INT USR ACT NAV FPL CAL SET OTH
íê.ñnm| VOR 12 KOWA
KOWA | IAF 1 ALMAY
# Leg| 2 D040L
*CRSR*| 4 MKT
Figure 5-21