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6.1.7 Example Approach: On-Airport Navaid
Another common type of approach is an approach that is
based on an on-airport navaid. These could be either
VOR or NDB approaches. An example of this type of
approach is the VOR RWY 24 approach to Bowman
airport in Louisville, Kentucky (Figure 6-21). The airport
identifier for this airport is KLOU.
For this example assume that the aircraft is approaching
KLOU from the Nabb VOR.
1.After passing the Nabb VOR, you are told to expect
the VOR 24 approach at KLOU. You load the approach
using the procedure described in section 6.1.1.
2.When the distance from the present position to the
destination airport reaches 30 NM, the KLN 90B will auto-
matically arm the approach mode. The CDI scale factor
will transition to ±1.0 NM and the KLN 90B will provide
more sensitive integrity monitoring.You also press
Ato
update the barometric information.
3.When the aircraft is 4 NM from the BQM VOR, the
KLN 90B will give a message reminding you to select the
OBS mode. The OBS mode is required for the procedure
turn. In this case, don’t select the OBS mode until after
the KLN 90B has sequenced past BQM-i and made
FF24-f the active waypoint. (This will keep you from hav-
ing to manually activate FF24-f while in the OBS mode.)
After passing BQM, select the outbound course of 068°
on the external CDI or HSI.
4.With the OBS mode selected and FF24 as the active
waypoint, it is possible to fly the procedure turn. Allow
enough distance past FF24 to complete the procedure
turn and still be 2 NM away before reaching the FAF.
After completing the heading portion of the procedure
turn, change the selected course to the inbound course of
248°on the external CDI or HSI.
5.Once established on the inbound course the Leg
mode will again need to be selected so that proper
approach operation and waypoint sequencing will occur.
NOTE: It is mandatory that the unit be in LEG mode with
the FAF as the active waypoint before crossing the FAF
to activate the approach active mode and change to ±0.3
NM scale factor. The CDI scale factor changes from ±1.0
NM to ±0.3 NM over the two miles to the FAF. Delaying
the switch from OBS to Leg mode compresses the scale
factor change. This makes the transition more abrupt. If
the switch from OBS to Leg is delayed too long it will not
be possible for the KLN 90B to change to the approach
active mode.
Rev 1
1.1 oq
BQMì |
âä068 |
107 uv
.01NM=|
òô068^|
†ü071^|2 FF24î
FF24
BQM
24
06
Figure 6-22
Figure 6-21