BendixKing KLN 900 - Pilots Guide - Manual (Page 158)

6-1
In this chapter you will learn how to use the KLN 900 for
non-precision approaches as well as SID/STAR proce-
dures. All of these procedures require that you are com-
fortable with the operation of the unit as presented up to this point. In particular, you need to be comfortable with
flight plan operation (chapter 4) and the OBS mode
(section 5.9).
Rev 2
CHAPTER 6 - LEVEL 4 OPERATION
6.1 NON-PRECISION APPROACH
OPERATIONS
Flying non-precision approaches using the KLN 900 are
not in themselves very difficult. However, it is different
than using traditional equipment such as VORs and
NDBs. With this in mind, make sure that you practice
with the KLN 900 in VFR weather with a check pilot
before attempting to use the KLN 900 in actual IFR condi-
tions.
CAUTION: The KLN 900 obtains approach informa-
tion from the database. Therefore, it is extremely
important that the database is current. The KLN 900
is approved for IFR non-precision approaches only
when the database is current. If you attempt to select
an approach when the database is out-of-date, you
will be given the status-line message: “OUTDATED
DB” in the bottom center portion of the screen as a
reminder.
The following sections assume that your KLN 900 is prop-
erly installed in the aircraft with all of the necessary
accessories to fly non-precision approaches. In most
cases this will mean that the aircraft has external
switch/annunciators to arm the approach mode and an
external annunciator to indicate when a message is active
and when waypoint sequencing is about to occur will also
be installed. In some installations the aircraft will have a
NAV/GPS switch to select which navigation source is dis-
played on the primary HSI or CDI.
The Super NAV 5 page has been specifically designed to
provide most of the functions needed for non-precision
approaches. This page provides an interface that pre-
sents pertinent navigation information, a way to access
the flight plan, and a graphic presentation of the present
position relative to the flight plan waypoints. You will find
this page to be a good friend while performing GPS
based non-precision approaches.
NOTE: There are some approach procedures in the
world that are not suited for the operational characteris-
tics of the KLN 900. These procedures are not included
in the database. Therefore it is not possible to use the
KLN 900 for these approaches. It is good preflight prac-
tice to verify that the KLN 900 contains the anticipated
procedures for each flight.
In addition to the two course modes (Leg and OBS)
described in section 5.9, there are also two approach
modes. These are approach arm and approach active.
The status of the approach mode is indicated both on an
external switch/annunciator and on the status line of the
KLN 900. In most installations the external annunciator
will indicate ARM for the approach arm mode and
approach active will be annunciated by ACTV. One dif-
ference of these modes from the normal enroute mode is
that the integrity monitoring is set to a tighter level.
Another difference between these modes and the enroute
mode is that the CDI scale factor will usually change to
±1.0 NM for approach ARM and will always change to
±0.3 NM when in the approach active mode.
The ARM mode can be selected in two ways. Normally,
the ARM mode is selected automatically by the KLN 900
when the aircraft is within 30 NM of an airport and an
approach is loaded in the flight plan for that airport. It is
possible to arm the approach mode at a distance greater
than 30 NM from the airport by pressing the external GPS
approach switch, but the KLN 900 will not change the CDI
scale factor until the aircraft reaches the 30 NM point. If
the GPS APR external switch is pressed while the
approach mode is armed, then the KLN 900 will disarm
the approach and change back to enroute mode. The
CDI scale factor will also change back to ±5.0 NM. The
approach can be re-armed by simply pressing the GPS
APR switch again.
The APR ACTV mode can only be engaged automatically
by the KLN 900. To cancel the APR ACTV mode press
the external GPS APR switch. This will change the mode
to APR ARM. Once past the Final Approach Fix (FAF), it
is not possible to return to the approach active mode with-
out conducting a missed approach and flying back to the
FAF.