Honeywell BENDIX/KING KLN 94 Pilot's Manual page 201

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KLN 94 Pilot's Guide
This message provides a reminder that to fly a course reversal the OBS
mode needs to be selected. Note from the approach chart that there is a
NoPT Arrival for this approach if arriving on airway radial 301. If you are
approaching OCN along this airway radial there is no need to perform a
course reversal and you need to ignore this message. The NoPT sector is
not stored in the database so it is not possible for the KLN 94 to know if a
course reversal is required or not; as a result, the KLN 94 will always give
this message whenever an IAF waypoint could be used for a course
reversal. If arriving along the airway radial the KLN 94 will properly
sequence to the FAF to MAP leg and transition to the approach mode
when 2 NM from the OCN IAF/FAF.
If, however, you are approaching from any other direction a course rever-
sal is required and the OBS mode will need to be selected by pressing the
H button. If the OBS mode is not selected before reaching OCN the
KLN 94 will automatically sequence to the missed approach point. This is
not desirable when performing a course reversal so the OBS mode must
be selected before reaching OCN.
NOTE: The KLN 94 will only remind you to select OBS mode if the IAF is
the active waypoint. Therefore if a course reversal is required, make sure
the IAF is the selected waypoint. For
ORS 02 and higher units the holding
pattern will be displayed on the map
(figure 6-42a) if configured to do so
on the SET 7 page. See section
3.11.4.12 for information on display-
ing holding patterns on the map.
5. Upon reaching OCN perform the appropriate holding pattern entry
and set the inbound course on the external CDI or HSI. In this exam-
ple the inbound course is 90°. At this point the KLN 94 works very
similar to a conventional VOR/DME.
6. Once established on the inbound course of 90°, 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. This is indicated by the active waypoint with an "f" suffix
(OCNf).
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 94 to change to the
approach active mode.
Chapter 6 Approaches and DP/STARs
Figure 6-42a
6-25

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