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EXAMPLE 3 – VOR/DME ARC OVERLAY APPROACH
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 GPS 155XL will still provide
approach navigation guidance through the arc by constantly displaying your distance
and bearing 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 head-
ing 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 094° radial. Thirty nautical miles from the airport, confirm that the GPS
APR switch indicates an ‘ARM’ status.
2. Fly towards the IAF (D094G). The GPS WPT annunciator will flash 15 seconds before you
reach the waypoint.
3. After crossing the IAF, set the GPSSEQ 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’
waypoint is part of the DME arc you are flying.
(continued on next page)
89
SECTION
5
APPROACH NAV
VOR/DME ARC
Example
DO NOT USE FOR NAVIGATION
MISSED APPROACH
CLIMB TO 3000 VIA HEADING
240° AND TOP R-213 TO
ERASE 25 DME AND HOLD.
25
TOP
7
TOP
7
7
TOP
TOP
VORTAC
ONE MINUTE
HOLDING PATTERN
048°
228°
205°
205°
1 MIN
200°
205°
IAF
TOPEKA
R-258
(IAF)
2600
(7)
(IAF)
R-094
3000
205° (7)
Arc
Arc
3000
3000
NoPT
NoPT
ERASE
VOR/DME RWY 21
TOPEKA/
FORBES FIELD(FOE)
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°
155xlb manual 1/12/99 4:06 PM Page 89