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EXAMPLE 3— VOR/DME ARC OVERLAY
Example 3 uses the VOR/DME RWY 21 approach into Topeka/Forbes Field Airport
(KFOE) and illustrates an approach based on a DME arc. Although DME arc
approaches are not based on a direct course, the GNC 300 will still provide approach
navigation guidance through the arc by constantly displaying your distance and bear-
ing from the DME reference navaid on the position page. To fly the arc, monitor the
distance displayed on the position page and manually adjust your heading to maintain
the course along the arc. When flying a DME arc, the GPS SEQ switch must be set to
the HOLD position to ensure proper CDI operation.
1. Select the VOR RW21 approach and select the d094g initial approach fix to fly the left
hand arc from the 094º radial. 30 nm from the airport, confirm that the GPS APR switch
indicates an ‘ARM’ status and enter the current altimeter setting of KFOE when the ‘Need
pres- press NAV’ message appears.
2. Fly to the IAF of the DME arc (d094g). The GPS WPT annunciator will flash 15 seconds
before you reach the waypoint.
3. After crossing the IAF, set the GPS SEQ switch to the HOLD position.
4. Set the desired inbound course (205º) on the CDI/HSI.
5. Press
N
and rotate
O
to display the position page. The position page will display the
DME navaid as the reference waypoint (on the bottom line) as long as your active to way-
point is part of the DME arc you are flying.
(continued on next page...)
87
APPROACH NAVI-
GATION
VOR/DME ARC
DO NOT USE FOR NAVIGATION
MISSED APPROACH
CLIMB TO 3000 VIA HEADING
25
TOP
7
TOP
7
7
T
O
P
TO
P
VORTAC
0
4
8
°
2
2
8
°
205°
205°
1 MIN
200
°
205°
IAF
TOPEKA
R-258
(IAF)
2600
(7)
(IAF)
R
-0
9
4
3000
205° (7)
A
rc
A
rc
3
0
0
0
3
0
0
0
N
oP
T
NoPT
ERASE
VOR/DME RWY 21
TOPEKA/
FORBES FIELD(FOE)
SECTION
6
APPROACH NAV
VOR/DME Arc Example
5 NM 7 NM
MISSED APPROACH
CLIMB TO 3000 VIA HEADING
240° AND TOP R-213 TO
ERASE 25 DME AND HOLD.
3000
2600
200°
12
7
TOP TOP
VORTAC
ONE MINUTE
HOLDING PATTERN
025°
205°
300 7/14/98 8:50 AM Page 87