Honeywell KLN 900s Pilot's Manual page 160

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 posi-
tion A in figure 6-1. If the aircraft's position is more 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
gradually change to ±1.0 NM over the next 30 seconds
and the external annunciator and the KLN 900's status
line will indicate ARM.
3. Get established on the final approach course.
• NoPT (No Procedure Turn) 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 900 confirms that adequate integrity
monitoring is available to complete the approach.
• RAIM is available at FAF & MAP
If any of these conditions are not met, the KLN 900 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, the external annunciator will indicate ACTV, and the
KLN 900's status line will display APR.
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 900 is in the
approach active mode (ACTV on external
annunciator, APR on the KLN 900's status line).
6. Fly to the Missed Approach Point (position E in
figure 6-1). The KLN 900 will not automatically sequence
to the next waypoint. You must manually change to the
appropriate waypoint according to the situation. By
default, the KLN 900 will nominate the first waypoint of
the published missed approach procedure when D is
pressed, and the active waypoint is the MAP and you
have flown past 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 900 are given in the following sections.
6-3
Rev 2