Honeywell KLN 900s Pilot's Manual page 15

Among the GPS Antennas that can be used with the KLN
900 are the KA 91 and KA 92. They are "patch" antennas
designed to always be mounted on the top of the aircraft.
The KLN 900 has analog outputs to drive the left-right
deviation bar of most mechanical CDIs and HSIs. In
addition, it has digital outputs to automatically drive the
course pointer and display flight plan waypoints on the
Bendix/King EHI 40 and EHI 50 electronic HSIs.
The Bendix/King KI 229 and KNI 582 RMIs may be inter-
faced to the KLN 900 to provide a display of magnetic
bearing to the waypoint.
The NAV mode of the Bendix/King KFC 150, KAP 150,
KAP 150H, KAP 100, KFC 200, KAP 200, KFC 250, KFC
275, KFC 300, KFC 325, KFC 400 and KFC 500 Flight
Control Systems may be coupled to the KLN 900. Many
other autopilots may also be coupled to the KLN 900.
Actual autopilot performance and capability when coupled
to the KLN 900 may vary significantly from one autopilot
model to another. Flight Control Systems utilizing either
digital or analog roll steering signals are supported.
Certain Digiflo™ and Miniflo™ fuel management systems
manufactured by Shadin Co. Inc. as well as certain fuel
computers manufactured by ARNAV Systems, Inc. and
Gebe Instruments interface with the KLN 900. These
interfaces allow the pilot to view fuel related parameters
calculated by the KLN 900 such as how much fuel will be
remaining when the aircraft lands at the destination. With
certain Shadin fuel management systems it is possible to
update the fuel on board through the KLN 900. In these
cases a separate panel mounted interface to the fuel
management computer is not required.
Compatible air data systems are available from
Bendix/King and Shadin Co. An air data system is capa-
ble of providing the KLN 900 with true air speed data
which is used for wind determination. Heading data from
the Bendix/King KCS 55A and some other compass sys-
tems maybe input directly into the KLN 900 for wind cal-
culations to be fully automatic.
Altitude may be provided to the KLN 900 from an encod-
ing altimeter or blind encoder, (either Gillham or DC alti-
tude) or one of the air data computers mentioned above.
Altitude is used as an aid in position determination when
an insufficient number of satellites are in view. Altitude is
also used in several altitude related features such as
three dimensional special use airspace alerting, height
above airport, and altitude alerting.
KA 92 GPS Antenna
Some installations may require remote annunciators to be
mounted in the aircraft panel in order to indicate the sta-
tus of certain KLN 900 functions. Specifically, the KLN
900 has outputs to provide annunciation for waypoint alert
and message. The KLN 900 will also interface with
Bendix/King distance indicators with King DME serial bus
or indicators using ARINC 561/568 data bus.
In installations where the KLN 900 will be used for
approaches, the installations are more complicated.
external switch/announciator is required to indicate the
approach made. Selected course is generally required to
be provided to the KLN 900 through an HSI, CDI or EFIS.
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