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6-11
4. If a course reversal is required, then upon reaching
TXO perform the appropriate holding pattern entry and
set the inbound course on the external CDI or HSI. In this
example the inbound course is 241°. At this point the
KLN 90B works very similar to a conventional VOR/DME.
5. Once established on the inbound course of 241°,
switch back to the Leg mode. When Leg mode is selected
the FAF is automatically made the active waypoint when
the IAF and the FAF are at the same waypoint.
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 will make 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.
6. When the aircraft is 2 NM from the FAF, the KLN 90B
will verify that the proper integrity is available. If integrity
monitoring is available for the approach, then the
KLN 90B will change to the Approach Active mode. This
will be annunciated on the external approach status
annunciator as well as on the KLN 90B. The CDI scale
factor will also start to change from ±1.0 NM to ±0.3 NM.
7. Upon reaching TXO, the KLN 90B will automatically
sequence to RW22, the missed approach point.
8. The fix at 8 DME from TXO along the final approach
course is not included in the waypoints that come from
the database. Since the distance that the KLN 90B is giv-
ing you is distance TO the MAP, you will need to mentally
figure out when the aircraft has reached this point. This is
done by looking at the along track distances given in the
plan view of the approach. In this case the fix is 4.1 NM
from RW22. Upon reaching this distance you can
descend to the MDA for this approach.
Rev 1
If a missed approach is required for this approach, then
the following steps would be required.
9. The published missed approach procedure for this
approach is to make a climbing left turn to 5700 feet and
proceed direct to the TXO VOR. In this case TXO will be
the default direct to waypoint when D is pressed. This
is the desired waypoint so press E to confirm the way-
point and proceed direct to the VOR.
NOTE: If ATC gives you instructions for a missed
approach that is different from the published missed
approach procedure, it is always possible for you to select
a different direct to waypoint than the default direct to
waypoint.
10. As the aircraft approaches TXO you will need to
select OBS mode to stop waypoint sequencing and
define the inbound course for the holding pattern. If you
do not select the OBS mode before the aircraft is within 4
NM of the holding point, then the KLN 90B presents a
message reminding you to select the OBS mode.
NOTE: If another attempt at the approach is desired
after holding, it is necessary to manually change the
active waypoint. When the FAF and the missed approach
holding point are at the same place then the KLN 90B will
automatically change the active waypoint to the FAF
when you change from OBS to LEG. Make sure to make
this change as soon as possible to ensure the approach
active mode becomes the active mode.