This message provides a reminder that to fly a
course reversal, the OBS mode needs to be selected.
If the aircraft is approaching the IAF from an area
where there is no need to perform a course reversal,
ignore the message. A NoPT arrival sector is not
stored in the database, so it is not possible for the KLN
90B to know that the course reversal is not required.
Therefore, the KLN 90B will always give the message
whenever a waypoint could be used for a course
reversal. If the aircraft is approaching from a NoPT
arrival sector, remain in the LEG mode. The KLN 90B
will properly sequence to the FAF to MAP leg and
transition to the approach mode when 2 nm from the
If approaching from a direction that requires a
course reversal, the OBS mode will need to be
selected. If the OBS mode is not selected before
reaching the IAF/FAF, the KLN 90B will automatically
sequence to the missed approach point. This is not
desirable if a course reversal is to be done.
The KLN 90B will only provide the reminder
to select OBS if the IAF is the active
4. If a course reversal is required, perform
the appropriate procedure and set the
inbound course on the HSI upon reaching
the IAF. At this point, the KLN 90B works
very similar to a conventional VOR/DME.
5. Once established on the inbound course,
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 the same waypoint.
It is mandatory that the unit be in the 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
2 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.
(1) When the aircraft is 2 nm from the FAF,
the KLN 90B will verify that proper integrity is
available. If integrity monitoring is available for the
approach, 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.
(2) Upon reaching the FAF, the KLN 90B will
automatically sequence to the MAP.
(3) A step down fix may not be included in
the list if waypoints are provided in the database.
Identify this point by using the along track distances
given in the profile view of the approach plate. In the
leg mode, the distance given by the KLN 90B is the
distance to the next point (in this case, the MAP), not
the distance from the last point (the FAF).
(4) The KLN 90B will provide waypoint
alerting as the missed approach point is approached.
This is shown on the Super NAV 5 page as a flashing
active waypoint identifier, as well as the external
flashing waypoint annunciator. If the auto scale factor
was chosen for the Super NAV 5 page, the airport
diagram will be visible when the aircraft is within 5 nm
of the airport. More detail is shown as the aircraft gets
to within 1 nm of the airport.
(5) If a missed approach is required, the KLN
90B will not automatically sequence past the missed
approach point. To perform the published missed
approach procedure, press the D button to bring up
the Direct To page. The default waypoint will be the
first waypoint of the published missed approach
procedure. Confirm this waypoint as the DIRECT TO
waypoint and press the ENT button.
approach are different from the published
procedure, it is always possible to select a
different direct to waypoint than the default
DIRECT TO waypoint.
(6) Prior to reaching the first point, if holding
is required, select the OBS mode to stop waypoint
sequencing and define the inbound course for the
holding pattern by setting the proper course on the
HSI. If the OBS mode is not selected before the
aircraft is within 4 nm of the holding point, the KLN
90B presents a message as a reminder to select the