Honeywell bendis king KLN 94, Maintenance Manual

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BENDIX/KING KLN 94
Rev 0, Sept/2000 15599M00.JA Page 4-1
SECTION IV
THEORY OF OPERATION
4.1 GENERAL INFORMATION
4.1.1 GENERAL DESCRIPTION
The KLN 94 is a panel-mounted, long range, GPS based airborne navigation system with a data-
base. The KLN 94 provides VFR, IFR enroute, terminal and non-precision approach functions.
The KLN 94 is certified to TSO C129a.
The primary purpose of the KLN 94 is to provide the pilot with present position information and to
display guidance information with respect to a user defined flight plan. Flight plan information is
entered by the user via various knobs and buttons located on the front panel.
The KLN 94 can use its present position information to determine crosstrack error, distance-to-
waypoint, ground speed, track angle, time-to-waypoint, bearing-to-waypoint, and advisory VNAV
guidance. The KLN 94 also has instrument approach capabilities.
The KLN 94 can also output some of this information for use by other devices. The internal data-
base of the KLN94 contains information concerning airports, VORs, NDBs, intersections, SID/
STARs, and outer markers located throughout the world. Waypoints are stored in the database
by their ICAO identifiers. The ICAO identifiers are taken directly from Jeppesen-Sanderson or gov-
ernment aeronautical charts. This data allows the pilot to create flight plans with minimum effort.
The KLN 94 can also store non-precision approaches. This allows the pilot to select an approach
as a whole, rather than entering the approach waypoint by waypoint.
Information in the database is updated on a perpetual basis. The KLN 94 is designed so that the
user may easily remove the old database and install a current database. The database is housed
in a data card which plugs into the front of the KLN 94. The database can also be updated by load-
ing the information with a personal computer via RS-232 serial interface.
For more information on the availability and cost of updating the database of the KLN 94, refer to
the KLN 94 Pilot’s Guide, P/N 006-18207-0000.
A color liquid crystal display (LCD) is used to display the navigation information. Connections to
the unit are made through one 37 pin and one 25 pin D-sub connector and one BNC coaxial con-
nector all located at the rear of the unit. Also, a phone jack is located on the front panel.
4.1.2 BASIC CONSTRUCTION
The KLN 94 contains several circuit boards and assemblies which are listed in Table 4-1, along
with reference series and connector information.
TABLE 4-1 ASSEMBLY DESIGNATIONS
ASSEMBLY PART NUMBER
REFERENCE
SERIES
CONNECTORS
GPS XPRESS BOARD 200-08825-0000 500 J501, J502
BUTTON BOARD 200-09641-0001 1000 J1007, J1017
BUS I/O BOARD 200-09642-0001 3000 J945, J3005
SUPPRESSOR BOARD 200-09665-0001 4000 J4005
MAIN BOARD 200-09638-0001 5000 J941, J942, J5001, J5003, J5004, J5005,
J5006, J5007, J5009, J5100, J5101, J5102
POWER BOARD 200-09639-0001 6000 J943, J6005, J6008
SWITCH BOARD 200-09640-0001 7000 J7001, J7005, J7008, J7011