BendixKing KLN 90B - Manual (Page 151)

6-3
General Procedure for Non-Precision Approaches
Non-precision approaches will all have the general flow of
events as follows. Refer to figure 6-1.
1. Select and load the approach into the flight plan.
This can be done at almost any time but must be com-
pleted before reaching the Final Approach Fix and should
be done as soon as possible. This corresponds to point
A in figure 6-1. If the aircraft is greater than 30 NM from
the airport, then the CDI scale factor will remain at the
default ±5 NM full scale deflection.
2. Transition to the approach arm mode. This will
occur automatically when the aircraft is within 30 NM of
the airport and there is an approach loaded into the flight
plan (position B in figure 6-1). The CDI scale factor will
change to ±1.0 NM over the next 30 seconds and the
external annunciator will indicate ARM.
3. Get established on the final approach course.
• NoPT arrival route
• Radar vectors (requires OBS mode)
• Procedure turn or holding pattern (requires
OBS mode)
• DME arc
4. Transition to the approach active mode. This
mode change is automatic and occurs at position C in
figure 6-1 when:
• the aircraft is 2 NM from the FAF and the
approach mode is armed
• the LEG mode is selected
• the aircraft is heading towards the FAF
• the FAF or a co-located IAF/FAF is the active
waypoint
• the KLN 90B confirms that adequate integrity
monitoring is available to complete the approach.
• RAIM is available at FAF & MAP
Rev 1
If any of these conditions are not met, the KLN 90B will
not transition to the approach active mode and a missed
approach will be required if the conditions do not change
before reaching the FAF. If all of these conditions are
met then the CDI scale factor will start to change to ±0.3
NM and the external annunciator will indicate ACTV.
5. At the FAF (position D in figure 6-1) the CDI scale
factor will be at ±0.3 NM and will remain at this scale fac-
tor until you manually cancel the approach mode by either
pressing the external GPS APR button to change to the
ARM mode, by initiating a direct to operation or by
changing to OBS mode.
WARNING: It is not approved to conduct the final
portion of the approach unless the KLN 90B is in the
approach active mode (ACTV on external
annunciator).
6. Fly to the Missed Approach Point. (position E in
figure 6-1). The KLN 90B will not automatically sequence
to the next waypoint. You must manually change to the
appropriate waypoint according to the situation. By
default, the KLN 90B will nominate the first waypoint of
the published missed approach procedure when
D is
pressed and the active waypoint is the MAP (rule number
4 in section 3.8).
7. If necessary conduct the missed approach
procedure. Remember to always refer to the paper chart
when conducting a missed approach. The OBS mode is
usually needed at some point during a missed approach
and is always required to fly the holding pattern (position
F
in figure 6-1).
The details of the above operations as well as several
examples of how to conduct non-precision approaches
using the KLN 90B are given in the following sections.