Honeywell KLN 94 User Manual

INSTALLATION MANUAL

B

KLN 94

GPS NAVIGATION SYSTEM

MANUAL NUMBER 006-10599-0004

REVISION 4 JANUARY, 2003

WARNING

Prior to export of this document, review for export license requirement is needed.

COPYRIGHT NOTICE

2000, 2003 Honeywell International, Inc.

Reproduction of this publication or any portion thereof by any means without the expressed
written permission of Honeywell is prohibited. For further information contact the Manager
of Technical Publications, Honeywell, Olathe, KS 66061. Telephone: [phone]

B KLN 94

REVISION INSTRUCTIONS AND HISTORY

MANUAL KLN 94 GPS NAVIGATION SYSTEM INSTALLATION
REVISION 2
PART NUMBER 006-10599-0002

Where R & R appears in the action column, remove the page now in the installation man­ual and replace it with the enclosed page; otherwise, ADD or DESTROY pages as listed.
Retain these instructions in the front of the installation manual as a Record of Revisions.

______________________________________________________________________
PAGE ACTION REASON FOR CHANGE
______________________________________________________________________

KLN 94 IM Covers R&R Updated

Revision History ADD Updated

1-1 thru 1-6 R&R Updated

1-9 thru 1-10 R&R Corrected

2-5 thru 2-12 R&R Updated

2-23 thru 2-82 R&R Updated

Rev. 4, Jan/2003 10599I04.CDL RH-1

B KLN 94

REVISION INSTRUCTIONS AND HISTORY

MANUAL KLN 94 GPS NAVIGATION SYSTEM INSTALLATION
REVISION 3
PART NUMBER 006-10599-0003

Where R & R appears in the action column, remove the page now in the installation man­ual and replace it with the enclosed page; otherwise, ADD or DESTROY pages as listed.
Retain these instructions in the front of the installation manual as a Record of Revisions.

______________________________________________________________________
PAGE ACTION REASON FOR CHANGE
______________________________________________________________________

KLN 94 IM Covers R&R Updated

Revision History R&R Updated

1-5 thru 1-6 R&R Corrected

Rev. 4, Jan/2003 10599I04.CDL RH-2

B KLN 94

REVISION INSTRUCTIONS AND HISTORY

MANUAL KLN 94 GPS NAVIGATION SYSTEM INSTALLATION
REVISION 4
PART NUMBER 006-10599-0004

Where R & R appears in the action column, remove the page now in the installation man­ual and replace it with the enclosed page; otherwise, ADD or DESTROY pages as listed.
Retain these instructions in the front of the installation manual as a Record of Revisions.

______________________________________________________________________
PAGE ACTION REASON FOR CHANGE
______________________________________________________________________

KLN 94 IM Covers R&R Updated

Revision History R&R Updated

1-5 thru 1-6 R&R Revised

2-78 thru 2-79 R&R Revised

Rev. 4, Jan/2003 10599I04.CDL RH-3

B KLN 94

THIS PAGE IS RESERVED

Rev. 4, Jan/2003 10599I04.CDL RH-4

B KLN 94

SECTION I

GENERAL INFORMATION

Paragraph Page

1.1 INTRODUCTION ............................................................................................... 1-1

1.2 EQUIPMENT DESCRIPTION ........................................................................... 1-1

1.3 TECHNICAL CHARACTERISTICS ................................................................... 1-1

1.3.1 KLN 94 Technical Characteristics ..................................................................... 1-1

1.3.2 KA 91 Antenna Technical Characteristics .......................................................... 1-5

1.3.3 KA 92 Antenna Technical Characteristics .......................................................... 1-5

1.3.4 KA 198 Comm Filter Technical Characteristics ................................................. 1-5

1.4 UNITS AND ACCESSORIES SUPPLIED ......................................................... 1-6

1.4.1 KLN 94 GPS Receiver ....................................................................................... 1-6

1.4.2 GPS Antenna .................................................................................................... 1-6

1.4.3 KLN 94 Installation Kit ....................................................................................... 1-6

1.4.4 KA 91/92 Installation Kit .................................................................................... 1-7

1.4.5 Database ........................................................................................................... 1-8

1.5 ACCESSORIES REQUIRED, BUT NOT SUPPLIED ........................................ 1-8

1.5.1 Forced Air Cooling ............................................................................................. 1-8

1.5.2 Indicators and HSIs ........................................................................................... 1-9

1.5.3 CDI Indicator With “MSG” and “WPT” Annunciators ......................................... 1-9

1.6 OPTIONAL ACCESSORIES ............................................................................. 1-9

1.6.1 PC Interface Kit ................................................................................................. 1-9

1.6.2 Annunciators and Switch / Annunciators ........................................................... 1-10

1.6.3 NAV / GPS Switching ........................................................................................ 1-13

1.6.4 Right Angle Connector ...................................................................................... 1-13

1.7 LICENSE REQUIREMENTS ............................................................................. 1-13

1.8 RECOMMENDATIONS FOR IFR APPROVAL .................................................. 1-13

1.8.1 Aircraft Logbook Entry ....................................................................................... 1-13

1.8.2 Aircraft Installation Requirements ..................................................................... 1-13

1.8.3 Approved Airplane Flight Manual Supplement .................................................. 1-14

1.8.4 Pilot’s Guide ...................................................................................................... 1-14

1.9 INSTRUCTIONS FOR CONTINUED AIRWORTHINESS ................................. 1-14

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SECTION II

INSTALLATION

Paragraph Page

2.1 GENERAL INFORMATION ............................................................................... 2-1

2.2 UNPACKING AND INSPECTING EQUIPMENT ............................................... 2-1

2.3 EQUIPMENT INSTALLATION ........................................................................... 2-1

2.3.1 Avionics Cooling Requirements For Panel Mounted Equip. .............................. 2-1

2.3.2 KLN 94 Mechanical Installation ......................................................................... 2-2

2.3.3 Antenna Selection ............................................................................................. 2-2

2.3.4 Antenna Installation Considerations .................................................................. 2-2

2.3.5 Antenna Mechanical Installation ....................................................................... 2-3

2.3.6 Electrical Installation ......................................................................................... 2-4

2.4 POST INSTALLATION CHECK OUT INFORMATION ....................................... 2-67

2.4.1 Maintenance Pages ........................................................................................... 2-67

2.4.2 Post Installation Checkout Procedure ............................................................... 2-73

2.4.3 Installation Check Out ....................................................................................... 2-74

2.4.4 Integrated Installation Check Out ...................................................................... 2-75

2.5 ERROR CODES ................................................................................................ 2-80

SECTION III

OPERATION

Paragraph Page

3.1 GENERAL INFORMATION ............................................................................... 3-1

APPENDIXES

APPENDIX A - RS 232 FORMAT DEFINITION .................................................................. A-1

APPENDIX B - SUPPLEMENTALS ..................................................................................... B-1

APPENDIX C - SUPPLEMENTAL TYPE CERTIFICATE ..................................................... C-1

APPENDIX D - DIRECT REPLACEMENT OF A KLN-89B WITH A KLN-94....................... D-1

APPENDIX E - ENVIRONMENTAL QUALIFICATION FORMS............................................ E-1

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LIST OF ILLUSTRATIONS

Figure Page

2-1 KLN 94 P941 CONNECTOR PIN FUNCTIONS ................................................ 2-10

2-2 KLN 94 P942 CONNECTOR PIN FUNCTIONS ................................................ 2-11

2-3 KLN 94 P943 CONNECTOR PIN FUNCTIONS ................................................ 2-13

2-4 KLN 94 CRIMPING AND INSERTION/EXTRACTION TOOLS ......................... 2-14

2-5 KLN 94 INSTALLATION DRAWING .................................................................. 2-15

2-6 KA 91 OUTLINE DRAWING .............................................................................. 2-17

2-7 KA 91 INSTALLATION DRAWING ..................................................................... 2-19

2-8 KA 91 BACKPLATE OUTLINE DRAWING ........................................................ 2-21

2-9 KA 92 OUTLINE DRAWING .............................................................................. 2-23

2-10 KA 92 INSTALLATION DRAWING ..................................................................... 2-27

2-11 KA 92 BACKPLATE OUTLINE DRAWING ........................................................ 2-29

2-12 KA 91/92 TNC ANTENNA COAX/CONNECTOR ASSEMBLY (0-40FT) ........... 2-31

2-13 KA 91/92 BMA ANTENNA COAX/CONNECTOR ASSEMBLY ......................... 2-33

2-14 KA 91/92 TNC/BMA ANTENNA COAX/CONNECTOR ASSEMBLY (0-80FT) .. 2-35

2-15 KA 33 P/N 071-4037-00/01 FINAL ASSEMBLY ................................................ 2-37

2-16 KA 33 P/N 071-4037-00/01 OUTLINE AND MOUNTING DRAWING ............... 2-39

2-17 CUTLER-HAMMER SWITCH/ANNUN. MOUNTING DRAWING ...................... 2-41

2-18 CUTLER-HAMMER SWITCH/ANNUN. INTERNAL SCHEMATIC .................... 2-43

2-19 KLN 94 SERIAL RECEIVERS & TRANSMITTERS INTERCONNECT DWG. .. 2-47

2-20 KLN 94 ALTITUDE AND RMI / OBI INTERCONNECT DRAWING.................... 2-49

2-21 KLN 94 DEVIATION AND FLAGS INTERCONNECT DRAWING ..................... 2-51

2-22 KLN 94 OBS RESOLVER INTERCONNECT DRAWING .................................. 2-53

2-23 KLN 94 INTERCONNECT DRAWING .............................................................. 2-55

2-24 KLN 94 FCS & EXTERNAL ANNUNCIATOR INTERCONNECT DRAWING .... 2-57

2-25 KLN 94 BACKLIGHTING & ALT. ALERTING INTERCONNECT DRAWING ..... 2-59

2-26 KLN 94 PC LOADER AND ANTENNA INTERCONNECT DRAWING .............. 2-61

2-27 KLN 94 DATA LOADER/PC INTERFACE........................................................... 2-63

2-28 KLN 94 QUICKTUNE INTERCONNECT DRAWING ........................................ 2-65

LIST OF TABLES

Ta bl e Page

2-1 GPS RECEIVER ERROR CODES.....................................................................2-81

2-2 GPS PAGE MESSAGES ....................................................................................2-83

2-3 GPS SYSTEM ERROR CODES ........................................................................2-84

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B KLN 94

SECTION I

GENERAL INFORMATION

1.1 INTRODUCTION

This manual contains information relative to the physical, mechanical, and electrical
characteristics of the BENDIX/KING KLN 94 Global Positioning System (GPS) Receiver. General
installation procedures are also included.

1.2 EQUIPMENT DESCRIPTION

The KLN 94 is a panel mounted, long range, GPS based airborne navigation system with a
database. The KLN 94 also provides VFR, IFR enroute, and IFR non-precision approach
functions. The primary purpose of the equipment is to provide the pilot with present position
information and to display guidance information with respect to a flight plan defined by the pilot.
Flight plan information is entered by the pilot via various knobs and buttons on the front panel.

The unit 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 database of the KLN 94 contains information concerning airports, VORs, NDBs,
intersections, DP/STARs, outer markers, roads, rivers, railroads, lakes, etc., throughout the
database’s coverage area. Waypoints are stored in the database by their ICAO identifiers. The
ICAO identifiers are in most cases taken directly from Jeppesen Sanderson or government
aeronautical charts. The KLN 94 has instrument approach capabilities.

The information stored in the database eventually becomes out of date; therefore, to provide a
means of updating the information, the database is housed in a data card which plugs into the
front of the KLN 94. It is designed so that the user may easily remove the old database and install
a current database. A secondary method of updating the database is by loading the information
via an IBM compatible laptop computer. For more information on availability and cost of updating
the database of the KLN 94, refer to the KLN 94 Pilot’s Guide P/N 006-18207-0000.

1.3 TECHNICAL CHARACTERISTICS

1.3.1 KLN 94 TECHNICAL CHARACTERISTICS

TSO/JTSO Compliance: TSO-C129a, JTSO-C129a - See Appendix C

for environmental qualification.

Physical Dimensions: Refer to KLN 94 installation drawing, Figure

2-5

Mounting: Panel mounted with Honeywell supplied

mounting rack

Cooling Requirements: 4 CFM (cubic feet per minute) provided by

blower motor such as KA33 or equivalent.

Temperature Range: -20°C to +55°C

Altitude Range: Up to 55,000 Feet

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Power Inputs: 11 to 33 VDC at 3.0 A Max. (-20°C to +55°C)

13.75 VDC @ 2.5 A Nominal

27.5 VDC @ 1.25 A Nominal

Panel Lighting Current Requirements:

14 VDC Lighting:

28 VDC Lighting:

GPS DISPLAYED:

OPEN:

GND

TAKE HOME

OPEN:

GND:

SPARE IN 0:

SPARE IN 1:

SPARE IN 2:

:

220 mA Maximum

110 mA Maximum

SIGNAL INPUTS

GPS displayed (when an indicator resolver is
connected to the OBS resolver inputs)

GPS not displayed (when an indicator resolver
is not connected)

Normal Operation

Tak e H om e M od e

These are reserved pins

for future use.

SPARE IN 3:

TEST:

OPEN:

GND:

APPROACH ARM IN

DATA LOADER RS 232 IN: This RS 232 input is designated to

SPARE RS 232 IN: This RS 232 input is reserved for future use.

GRAY CODE INPUTS:

(A1, A2, A4, B1, B2, B4, C1, C2, C4, D4)

OBS SIN: OBS resolver sine. Nominal input impedance is

: This pin is normally open with a momentary low

Normal Operation

Test Mode

while the panel button is pressed.

communicate with devices, ie. air data and fuel
flow sensors via RS 232 format. (refer to RS

232 Format Definitions Appendix)

Gray Code Altitude Signals. (0 to 28 VDC)
These inputs are diode isolated inside the KLN

94.

33.8 K ohms (AC) and 100 K ohms (DC)

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OBS COS: OBS resolver cosine. Nominal input impedance

is 33.8 K ohms (AC) and 100 K ohms (DC).

A/C POWER MONITOR: This pin senses the aircraft power bus voltage.

This high impedance input operates from 0 to
33 V with accuracy of 0.1 V.

CONFIGURATION MODULE: Refer to Section 2.3.6.2

SIGNAL OUTPUTS:

OBI SYNC, OBI CLOCK, & OBI DATA: Honeywell Serial Data containing bearing to

the active waypoint.

DATA LOADER/QUICKTUNETM RS 232 OUT: The Data Loader/QuickTune RS 232 output is

designed to communicate with an IBM
compatible personal computer.

GENERAL RS 232 OUT: The RS 232 output is designed to interface with

certain ARNAV ELTs and certain moving map
displays, and Shadin fuel flow systems (refer to

RS 232 Format Definitions Appendix).

GPS SENSOR RS 232 OUT: The GPS Sensor RS 232 output is a buffered

connection to the GPS sensor (Xpress)
transmitter connection to the host processor. It
is designed to interface with a EGPWS, and for
testing.

WAYPOINT ANNUNCIATE

MESSAGE ANNUNCIATE

APPROACH ACTIVE ANNUNCIATE

APPROACH ARM ANNUNCIATE

SPARE ANNUNCIATE 1

SPARE ANNUNCIATE 2

ROLL STEERING VALID
N/A on -0101

: OPEN = Inactive

LOW = Active (Output can sink up to 250 mA)

: OPEN = Inactive

LOW = Active (Output can sink up to 250 mA)

: OPEN = Inactive

LOW = Active (Output can sink up to 250 mA)

: OPEN = Inactive

LOW = Active (Output can sink up to 250 mA)

: Spare annunciators are reserved for future

use.

: Spare annunciators are reserved for future

use.

Valid =
14 VDC installations. Invalid =
installations while sinking 1 mA. Output can

source at least 250 mA.

≥ 18 V in 28 VDC installations; ≥ 10 V in

≤ 3.5 V in all

ROLL STEERING HI
N/A on -0101

Output Range: 550mV per degree of Bank.
2V per degree per second of
Turn Rate.

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ROLL STEERING LO This is an output. It is always grounded

FCS LOC ENG

LATERAL DEV FLAG +:
LATERAL DEV FLAG -:

VERTICAL DEV FLAG +:
VERTICAL DEV FLAG -:

LATERAL SUPERFLAG:

VERTICAL SUPERFLAG: Reserved for future use.

LATERAL DEV +L:
LATERAL DEV +R-:

VERTICAL DEV +UP:
VERTICAL DEV +DOWN:

: OPEN = Inactive

LOW = Active (Output can sink up to 250 mA)

Valid: 350 to 900 mV (high)
Flag in view:
Output is capable of driving five 1k ohm parallel
loads.

Reserved for future use.

Valid =
14 VDC installations. Invalid =
installations while sinking 1 mA. Output can

source at least 250 mA.

These outputs are differential pairs (+L and
+UP are positive). Output range is
and is capable of driving five 1k ohm parallel
loads.

Reserved for future use.

≤ 50mV (low)

≥ 18 V in 28 VDC installations; ≥ 10 V in

≤ 3.5 V in all

± 300 mV

OBS OUT: Used to excite the OBS resolver rotor. Nominal

output frequency = 450 Hz. Nominal unloaded
peak amplitude = 6 V. Output drive capability =
40 mA.

+TO / +FROM Flag Outputs:

To Indication:

From Indication:

+100 to +900 mV on +TO with respect to
+FROM when desired course is within
the bearing to the active waypoint.

-100 to -900 mV on +TO with respect to
+FROM when desired course is within 180

± 85° of

± 85° with respect to the bearing of the active

waypoint. Outputs are capable of driving up to
five 200 ohm parallel loads.

ALTITUDE ALERT ANNUNCIATE: HIGH = Inactive

LOW = Active (can sink up to 250 mA)

ALT ALERT AUDIO

: This output is active whenever ALTITUDE

ALERT ANNUNCIATE is active, Signal is 1Khz,

3.5 Vrms max into 500 ohms. Refer to

Paragraph 2.4.4.9 for the procedure to adjust

the volume.

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1.3.2 KA 91 ANTENNA TECHNICAL CHARACTERISTICS

TSO Compliance: TSO-C129 - See Appendix C

for environmental qualification.

Physical Dimensions: Refer to KA 91 installation drawing, Figure

2-7

Airspeed Rating: 600 Kts. TAS

Output Impedance: 50 Ohms (nominal)

DC Voltage:

DC Current: 50 mA (maximum)

1.3.3 KA 92 ANTENNA TECHNICAL CHARACTERISTICS

TSO Compliance: TSO-C129 - See Appendix C

Physical Dimensions: Refer to KA 92 installation drawing, Figure

Airspeed Rating: 600 Kts. TAS

Output Impedance: 50 Ohms (nominal)

DC Voltage:

DC Current: 50 mA (maximum)

1.3.4 KA 198 COMM FILTER TECHNICAL CHARACTERISTICS (P/N 071-01565-0000)

5 Volts

for environmental qualification.

2-10

5 Volts

± 0.5 Volt

± 0.5 Volt

Center Notch Frequency: 1575.42 MHz

Attenuation at 1575.42

Insertion Loss from 118.00 to 137.00 MHz .3dB (maximum)

Impedance from 118.00 to 137.00 MHz 50 ohms

VSWR from 118.00 to 137.00 MHz 1.5:1

The conditions and tests performed on this article are minimum
performance standards. It is the responsibility of those desiring to
install this article either on or within a specific type or class of
aircraft to determine that the aircraft installation conditions are
within these performance standards. The article may be installed
only if further evaluation by the applicant documents an acceptable
installation and is approved by the Administrator.

±1.5 MHz

35 dB (minimum)

NOTE

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1.4 UNITS AND ACCESSORIES SUPPLIED

1.4.1 KLN 94 GPS RECEIVER

The KLN 94 is available in the following versions

PART NUMBER

069-01034-0101 X X VFR / IFR (BRNAV) KLN 94

069-01034-0102 X X VFR / IFR (BRNAV and

1.4.2 GPS ANTENNA

The KA 91 antenna is available by ordering P/N 071-01545-0200. The KA 92 antenna is available
by ordering P/N 071-01553-0200.

1.4.3 KLN 89/89B/94 INSTALLATION KIT

The KLN 89/89B/94 Installation Kit (P/N 050-03321-0000) is available with crimp connectors only.
A list of the required crimp tools and insertion/ extraction tools can be found in Section 2 of this
manual. The kit and a complete list of the items contained in the kit is given below.

P/N DESCRIPTION UM -0000

14V / 28V

LAMPS

BLACK

BEZEL

CERTIFICATION VERSION

KLN 94

DC Roll Steering)

VENDOR

NAME & P/N

030-01173-0000 CONN SUB-D HSG 25S (FEMALE PINS) EA 1

030-01175-0000 CONN SUB-D HGS 37S (FEMALE PINS) EA 1

073-01030-0502 CONNECTOR MOUNTING BRACKET EA 1

076-03019-0002 SHOULDER SCREW 4-40 W/FIN RF 4

089-05903-0004 SCR PHP 4-40 x 1/4 RF 4

030-01157-0011 SOCKET CRMP 20G EA 62

089-05907-0004 SCR PHP 6-32 x 1/4 EA 4

089-02353-0001 NUT CLIP 6-32 EA 6

089-05903-0007 SCR PHP 4-40 x 7/16 EA 2

089-06012-0006 SCR PHP 6-32 x 3/8 EA 6

090-00019-0007 RING RTNR .438 EA 1

030-00101-0002 PANEL MOUNT PLUG EA 1

187-01352-0000 GASKET EA 1

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P/N DESCRIPTION UM -0000

047-05959-0002 STRAIN RELIEF W/H EA 2

047-05960-0001 STRAIN RELIEF W/F EA 2

200-08334-0000 EXT EEPROM BD EA 1

033-00230-0000 TELEPHONE JACK, 4 CONDUCTOR EA 1

057-05621-0000 DECAL DATA LOADER EA 1

057-05628-0000 GPS DISCLAIMER EA 1

089-08252-0030 WASHER EA 1

1.4.4 KA 91/92 INSTALLATION KIT

The KA 91 Installation Kit (P/N 050-03195-0000), including its contents, is shown below.

P/N DESCRIPTION UM -0000 VENDOR NAME & P/N

VENDOR

NAME & P/N

050-03195-0000 KA 91 INSTALL X

030-00134-0001 RIGHT ANGLE CONN COAX EA 1 TED Mfg. 5-30-102

047-10130-0002 BACKPLATE, ANTENNA EA 1

089-06908-0012 SCREW, AIRCRAFT EA 4

187-01807-0000 KA 91 GASKET EA 1

Earlier installation kits included a straight TNC coax connector, P/N 030-00134-0000.

The KA 92 Installation Kit (P/N 050-03318-0000), including its contents, is shown below.

P/N DESCRIPTION UM -0000 VENDOR NAME & P/N

050-03318-0000 KA 92 INSTALL X

030-00134-0001 RIGHT ANGLE CONN COAX EA 1 TED Mfg. 5-30-102

047-10735-0002 BACKPLATE, ANTENNA EA 1

089-05909-0012 SCREW, PHP 8-32x3/4 EA 4

187-01831-0000 KA 92 GASKET EA 1

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1.4.5 DATABASE

The KLN 94 is supplied with two different kinds of databases:

1) NAVIGATION DATABASE
This is required to be current for IFR non-precision approaches. Our navigation database is
available on a twenty-eight day cycle.

2) CARTOGRAPHY DATABASE
This includes features such as roads, rivers, railroads, etc. and is provided for reference only.
Cartography database updates are available on a less frequent basis than the navigation
database updates. Updating the cartography database will require a cartridge exchange.

The KLN 94 navigation database cartridge and diskettes are available for three separate
geographic areas. Database cartridges are available only for users in the United States Of
America and Canada. Diskettes are available to all users. Also database files can be dowloaded
via the Internet at the following address: http://www.gpsdatabase.com

KLN 94 DATABASE

Atlantic International Database 071-00163-0101 223-111YY-00CC

Pacific International Database 071-00163-0102 223-112YY-00CC

Americas Database 071-00163-0103 223-113YY-00CC

YY represents the year of the database cycle.

CC represents the cycle of the database.

1.5 ACCESSORIES REQUIRED, BUT NOT SUPPLIED

1.5.1 Forced Air Cooling

A KA 33 Cooling Kit or equivalent is required for the KLN 94 installation.

DESCRIPTIOIN PART NUMBER

(navigation and cartography)

CARTRIDGE

NOTE

DISKETTE

(navigation only)

KA 33 Blower for 14 VDC installations 071-4037-00

KA 33 Blower for 28 VDC installations 071-4037-01

KA 33 Blower Installation Kit 050-02204-0000

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1.5.2 Indicators and HSIs

DESCRIPTION

KI 202 or KI 206 (P/N 066-3034-XX)
Navigation Indicator and Installation Kit (050-01524-0000)

KI 208A or KI 209A (P/N 066-3056-XX)
Navigation Indicator and Installation Kit (050-01524-0000)

KPI 553A (P/N 066-3045-XX)
Horizontal Situation Indicator and Installation Kit (050-01791-XXXX)

KPI 553B (P/N 066-3069-XX)
Horizontal Situation Indicator and Installation Kit (050-02167-XXXX)

KI 525A (P/N 066-3046-XX)
Horizontal Situation Indicator and Installation Kit (050-01334-XXXX)

NOTE

The KPI 553A/553B DME distance display is not compatible with
the KLN 94.

The KPI 553A models that do not have an OBS knob on the
indicator were special for the KNR 665 system and are not
compatible with the GPSs.

1.5.3 CDI Indicator with "MSG" and "WPT" Annunciators

Some stand alone CDI indicators are available with WPT/MSG annunciators built in. One
commonly used is the Model MD40-39, manufactured by Midcontinent Instrument, telephone
[phone]. These devices have no resolver interface. The use of an OBS resolver will
reduce pilot workload.

1.6 OPTIONAL ACCESSORIES

1.6.1 PC Interface Kit

The navigation database may be loaded directly from the PC to the KLN 94 installed in an aircraft
by means of the bezel jack (refer to Section 2.4.4.8 for details). To utilize the bezel jack for loading
of the database, order kit part number 050-03612-0000.

If the installation was previously a KLN 89B installation and utilized an external jack, order
interface kit P/N 050-03213-0000 in order to load the navigation database from a personal
computer. The kit contains a ready to use cable which connects between the aircraft connector
and the computer’s 9 pin or 25 pin serial connector. The kit is necessary whether the user is
loading from a Honeywell diskette or a database obtained via the Internet.

The cartography database is contained in the Sandisk cartridge. The cartography data is not
updated as frequently as the navigation data.

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It is necessary to swap cards to update the cartography data. Updating the navigation database
will not compromise the cartography database.

Laptop computers used to load the database require the following:

1. IBM compatibility

2. An available Com 1,2,3, or Com 4 serial port

NOTE

The PC must be fully IBM compatible and must have a 3.5" high
density diskette drive, If the database is loaded from a diskette sent
from Honeywell. For more information, contact Honeywell Product
Services by telephoning [phone].

1.6.2 Annunciators and Switch/Annunciators

(Refer to I.B. 363 for additional information pertaining to switch/annunciators for GPS systems)

The devices shown below are Eaton 582/584 series switch/annunciators and are representative
of those used in our original certification. They were chosen because of their excellent sunlight
readable characteristics and meet or exceed the requirements of Advisory Circular 20-138.
These are high quality devices and we encourage their use. However, there are other
comparable devices on the market that may be substituted at the installer’s/customer’s choice.

These switch/annunciators are available through Honeywell Service Stock or direct from our
supplier, LCOMP Inc. It is advantageous to order direct from LCOMP, if possible, in order to avoid
additional price mark-ups. On international orders, it may be necessary to order through
Honeywell as LCOMP, at the time of this publication, is not prepared to handle international
orders. The address and telephone numbers for LCOMP are listed as follows:

LCOMP Aerospace Controls [phone] Telephone
c/o Carlton-Bates Co. [phone] Toll Free
9214 Bond St. [phone] Fax
Overland Park, KS 66214

NOTE

The switch/annunciators listed below in many cases show two
numbers. The part numbers that are shown in parentheses are
devices previously called out and may be used until supply is
depleted. The 031-00785-XXXX are the preferred
Switch/Annunciator assemblies.

Rev. 4, Jan/2003 10599I04.CDL Page 1-10

B KLN 94

KLN 94 Enroute/Terminal Set for CDI or Elect. Mech. HSI Installations

The following switch/annunciators are being offered for CDI or HSI switching and annunciation in
the KLN 94 IFR enroute/terminal installations. They are optional for KLN 94 VFR installations.
The KLN 94 has internal annunciators. Hence, the external annunciators may be optional in
some installations:

KLN 94/89/89B Annunciator Set - 28 VDC Lighting

NAV / GPS Sw. Ann 031-00785-0711 or 031-00763-0711

WPT / MSG Ann. 031-00785-0505 or 031-00763-0505 / -0718

KLN 94/89/89B Annunciator Set - 14 VDC Lighting

NAV / GPS Sw. Ann 031-00785-0712 or 031-00763-0712

WPT / MSG Ann. 031-00785-0762 or 031-00763-0762 / -0719

KLN 94 Approach Set for CDI or Elect. Mech. HSI Installations

The following switch/annunciators are being offered for CDI or HSI switching, APR switching, and
annunciation in KLN 94 non-precision approach installations:

KLN 94/89B Annunciator Set - 28 VDC Lighting

NAV / GPS Sw. Ann 031-00785-0711 or 031-00763-0711

WPT / MSG Ann. 031-00785-0505 or 031-00763-0505 / -0718

GPS APR ARM / ACT Sw. Ann. 031-00785-0766

KLN 94/89B Annunciator Set - 14 VDC Lighting

NAV / GPS Sw. Ann 031-00785-0712 or 031-00763-0712

WPT / MSG Ann. 031-00785-0762 or 031-00763-0762 / -0719

GPS APR ARM / ACT Sw. Ann. 031-00785-0767

Rev. 4, Jan/2003 10599I04.CDL Page 1-11

B KLN 94

NAV/GPS Switch/Annunciator

Installations where the outputs from KLN 94 and an existing navigation system are switched
between a common indicator or HSI may require some type of annunciation. A NAV/GPS
switch/annunciator is available that provides both the annunciation and a switch contact to
energize the switching relay(s) required for the switching of the outputs. This Switch/Annunciator
is available in 5 V, 14 V, or 28 V versions as shown below.

LIGHTING Honeywell P/N Honeywell P/N

28 VDC 031-00763-0711 031-00785-0711

14 VDC 031-00763-0712 031-00763-0712

(Eaton Series 584) (Eaton Series 582)

Old Style Preferred

WPT/MSG Remote Annunciators
TWO FIELD ANNUNCIATORS (WPT/MSG)

LIGHTING Honeywell P/N Honeywell P/N

28 VDC 031-00763-0505 031-00785-0505

14 VDC 031-00763-0506 031-00763-0506

(Eaton Series 584) (Eaton Series 582)

Old Style Preferred

NOTE

(WPT) AND (MSG) will be in amber color. These annunciators will
be deadface and readable only when lit.

GPS APR, ARM/ACTV Switch/Annunciator

A switch/annunciator can be used for arming or activating the approach mode. It will provide
remote annunciation of ARM and ACTV and provide a momentary switch function to arm, disarm,
or deactivate the Approach Mode and change the CDI scale factors. The KLN 94 may require an
annunciator to display when approach is armed or active.

LIGHTING Honeywell P/N

28 VDC 031-00763-776

14 VDC 031-00763-767

(Eaton Series 582)

Rev. 4, Jan/2003 10599I04.CDL Page 1-12

B KLN 94

1.6.3 NAV/GPS Switching

Installations in which the outputs from a KLN 94 and an existing navigation system are being
switched onto a common indicator will require some remote relay switching that is controlled by
the NAV/GPS switch/annunciator.

1.6.4 Right Angle Connector

The part number for a right angle connector for the KA 91 or KA 92 antenna connection is
030-00134-0001. This right angle connector was originally an option but has been included in the
installation kit as the standard connector.

1.7 LICENSE REQUIREMENTS

None.

1.8 RECOMMENDATIONS FOR IFR APPROVAL

1.8.1 Aircraft Logbook Entry

1.8.2 Aircraft Installation Requirements

NOTE

For the following subsections, refer to Section 1.5 and Section 1.6
for allowable configurations where applicable. Refer to Section II for
illustrations.

1.8.2.1 TSO/JTSO’d Antenna

The antenna must be a TSO/JTSO’d KA 91, P/N 071-01545-0200 or KA 92 P/N
071-01553-0200. If the P/N of the KA 91 is not available, it may be identified by the serial number
as the TSO/JTSO’d antennas have a five digit serial number.

1.8.2.2 Nav Instrumentation

The navigation information (D-Bar, Nav Flag, and To-From) must be displayed on an instrument
in the pilot’s panel. Electromechanical indicators are capable of displaying the variable scale
factors of enroute, terminal, and approach modes.

1.8.2.3 OBS Interface

The use of an OBS resolver will reduce pilot workload during an instrument approach. It allows
the OBS setting to be changed on the navigation indicator when the KLN 94 is operating in the
OBS mode. Without the OBS resolver connection, the OBS may be changed from the KLN 94
controls. OBS mode is commonly used during procedure turns and holding patterns.

Some certification agencies may require the use of the OBS resolver for approach certification.
Consult your approval agency for additional information. Refer to Section 1.3 and Section 2.3.6
for additional OBS information.

Rev. 4, Jan/2003 10599I04.CDL Page 1-13

B KLN 94

1.8.2.4 Switch/Annunciators

1.8.2.4.1 NAV/GPS (Switch/Annunciator)

If the navigation information is displayed on a shared primary indicator a switch/annunciator will
be required to select and annunciate the source.

1.8.2.4.2 WPT/MSG (Annunciator)

The KLN 94 has internal annunciators. The “WPT” and “MSG” external annunciators may be
required in some installations.

1.8.2.4.3 GPS APR, ARM/ACT (Switch/Annunciator)

A switch/annunciator can be used for arming, disarming, or deactivating the approach mode. It
will provide remote annunciation of ARM and ACTV and provide a momentary switch function to
arm and activate the Approach Mode and change the CDI scale factors. The KLN 94 may require
an annunciator to display when approach is armed or active. Refer to Section 1.6 for additional
switch/annunciator information.

1.8.2.4.4 Altitude Source

An altitude source is required for IFR certification. The altitude may be derived from a compatible
encoding altimeter and some RS 232 air data systems.

1.8.3 Approved Airplane Flight Manual Supplement

A flight manual supplement will need to be prepared and approved. The supplement may be
prepared based on the sample, P/N 006-00839-0000. Refer to the Flight Manual Supplement

Procedures Appendix for information on preparing a flight manual supplement and a copy of the

STC approval.

1.8.4 Pilots Guide

The KLN 94 pilots guide must be placed in the aircraft in a location that is accessible to the pilot.
The pilots guide is P/N 006-18207-0000.

1.9 INSTRUCTIONS FOR CONTINUED AIRWORTHINESS

The instructions for continued airworthiness given in the TC or STC approvals for this product
supplements or supersedes the instructions for continued airworthiness in this manual.

Most Honeywell products are designed and manufactured to allow "on condition maintenance".
On condition maintenance is described as follows; There are no periodic service requirements
necessary to maintain continued airworthiness. No maintenance is required until the equipment
does not properly perform it’s intended function. When service is required, a complete
performance test should be accomplished following any repair action. Consult the appropriate
unit Maintenance/Overhaul Manual for complete performance test information.

Rev. 4, Jan/2003 10599I04.CDL Page 1-14

B KLN 94

SECTION II

INSTALLATION

2.1 GENERAL INFORMATION

This section contains general suggestions and information to consider before installation of the
KLN 94 GPS RNAV. Close adherence to these suggestions will assure optimum performance
from the equipment.

NOTE

For aircraft equipped with a KLN 89B that is being replaced by a
KLN 94 refer to Appendix D, Direct Replacement of a KLN 89B with
a KLN 94, at the end of this manual.

NOTE

The conditions and tests required for TSO/JTSO approval of this
article are minimum performance standards. It is the responsibility
of those desiring to install this article either on or within a specific
type or class of aircraft to determine that the aircraft installation
conditions are within TSO/JTSO standards. The article may be
installed only if further evaluation by the applicant documents an
acceptable installation and is approved by the Administrator.

2.2 UNPACKING AND INSPECTING EQUIPMENT

Exercise extreme care when unpacking the equipment. Make a visual inspection of the unit for
evidence of damage incurred during shipment. If a claim for damage is to be made, save the
shipping container to substantiate the claim. The claim should be promptly filed with the
transportation company. It would be advisable to retain the container and packaging material
after all equipment has been removed in the event that equipment storage or reshipment should
become necessary.

2.3 EQUIPMENT INSTALLATION

2.3.1 AVIONICS COOLING REQUIREMENTS FOR PANEL MOUNTED EQUIPMENT

The greatest single contributor to increased reliability of all modern day avionics is to limit the
maximum operating temperature of the individual units whether panel mounted or remote
mounted. While modern day individual circuit designs consume much less electrical energy,
watts per cubic inch dissipated within the avionics unit remains much the same due to the high
density packaging techniques utilized. Consequently, the importance of providing cooling to the
avionics stack is still with us today.

While each individual unit may or may not require forced air cooling, the combined heat load of
several units operating in a typical avionics location will significantly degrade the reliability of the
avionics if provisions for cooling are not incorporated in the initial installation. Failure to provide
cooling to the equipment will lead to increased avionics maintenance costs and may also void the
Honeywell warranty.

Rev. 4, Jan/2003 10599I04.CDL Page 2-1

B KLN 94

In the case of the KLN 94, installation of a KA 33, (P/N 071-4037-XX), or equivalent cooling
system is required. Ram air cooling is not acceptable. For installation information on the KA 33
refer to the KA 33 installation manual, P/N 006-01069-XXXX or Installation Bulletin 258.

2.3.2 KLN 94 MECHANICAL INSTALLATION

The KLN 94 installation will conform to standards designated by the customer, installing agency,
and existing conditions as to the unit location and type of installation. However, the following
suggestions will assure a more satisfactory performance from the equipment.

A. Plan a location on the aircraft panel so that the KLN 94 is plainly visible to the pilot and so that
he has complete access to all front panel controls. Check to be sure that there is adequate depth
behind the panel for the mounting rack and all the connectors and cabling. Be sure that the
mounting location is not close to heater vents or other sources of high heat.

B. Refer to figure 2-3 for the panel cutout dimensions. Mark and cut the panel opening.

2.3.3 ANTENNA SELECTION

The KA 91 and KA 92 GPS active antennas, P/N 071-01545-0200 and 071-01553-0200
respectively, are the designated antennas for the KLN 94.

2.3.4 ANTENNA INSTALLATION CONSIDERATIONS

The antenna should be mounted on top of the fuselage near the cockpit. Avoid mounting the
antenna near any projections, the propeller, and the T-tail of the aircraft, where shadows could
occur. It is recommended that there be a separation of at least 3 ft between the KLN 94 GPS
antenna and any VHF Comm antenna on the aircraft. Antenna baseplate must be level within
± 5° in both axes when the aircraft is in level flight. If the antenna is tilted more than 5° or is
mounted close to other objects that shadow it, loss of some of the satellites will occur and system
performance may be degraded. Antenna cable and connector information, including vendor
information, is listed below. Refer to figure 2-10 (TNC) and figure 2-11 (BMA) for cable/connector
assembly instructions for the 0 to 40 feet category using RG 400/U or RG 142B/U. Refer to

Figure 2-12 (for both TNC and BMA) for the 0 to 80 feet and 0 to 100 feet categories.

NOTE

KA 91/92 nominal gain and noise figures are 26.5 dB and 2.3 dB
respectively. With 0.050 ice on radome, gain will not decrease by
more than 2.0 dB when viewing a satellite from 30° above the
horizon to zenith, as compared to a no ice condition.

Rev. 4, Jan/2003 10599I04.CDL Page 2-2

B KLN 94

CABLE

LENGTH

0 to 40 ft P/N: 024-00002-0000

0 to 80 ft P/N: 024-00072-0000

0 to 100 ft P/N: 024-00071-0000

100 to 165 ft Contact TED, ECS or PIC for complete cable/connector assembly.

CABLE

PART NUMBER

VPN: RG142B/U

P/N: 024-00051-0060
VPN: RG400/U

VPN: ECS 311601

VPN: ECS 311201

BMA

CONNECTOR

P/N: 030-00101-0002
VPN: TED Mfg. 9-30-10

P/N: 030-00101-0002
VPN: TED Mfg. 9-30-10

P/N: 030-00452-0000
VPN: TED Mfg. 9-30-26

P/N: 030-00452-0001
VPN: TED Mfg. 9-30-25

TNC

CONNECTOR

P/N: 030-00134-0001
VPN: TED Mfg. 5-30-102

P/N: 030-00134-0001
VPN: TED Mfg. 5-30-102

P/N: 030-00108-0002
VPN: TED Mfg. 5-10-307

P/N: 030-00108-0003
VPN: TED Mfg. 5-10-306

NOTE

A right angle antenna connector is available from Honeywell
(P/N 030-00134-0001) or from TED.

MAXIMUM

ALLOWABLE

LOSS (dB)

8.0

8.0

8.0

8.0

TED Manufacturing Corp. Electronic Cable Specialists PIC Wire and Cable

11415 Johnson Drive 5300 West Franklin Drive N53 W 24747 S. Corporate Circle

Shawnee, Kansas 66203 Franklin, Wisconsin 53132 P.O. Box 330

Tel: [phone] Tel: (800) ECS-WIRE Sussex, Wisconsin 53089

or [phone] Tel: [phone]

or [phone]

2.3.5 ANTENNA MECHANICAL INSTALLATION

2.3.5.1 General

To maintain good performance from the antenna system, do not wax or paint the antenna.

2.3.5.2 Installation Procedure

A. Using the correct template for the antenna chosen, mark the mounting holes on the aircraft

fuselage.

B. Drill and/or punch the required holes.

Rev. 4, Jan/2003 10599I04.CDL Page 2-3

B KLN 94

C. Use a piece of fine sandpaper or emery cloth to sand the area on the fuselage skin on which

the doubler plate for the antenna is to be mounted and on the aircraft skin under where the
antenna will be mounted.

D. Apply Alumiprep No. 33, P/N 016-01127-0000, to both the inside and outside areas of the

fuselage and to the back of the doubler plate. Follow the directions on the container to
cleanse the metal of any left over residue.

E. Apply Alodine, P/N 016-01128-0000, to both locations following the directions on the

container. This is used to ensure good bonding of the antenna and to prevent oxidation.

F. Refer to Figure 2-5 for the KA 91 installation drawing or Figure 2-8 for the KA 92 installation

drawing and mount the antenna as shown. First rivet the doubler plate in place. It is
imperative that the doubler plate make a good electrical bond with the inside of the aircraft
skin and that the antenna itself be well bonded to the aircraft.

G. When installing the KLN 94 antenna (KA 91/KA 92) do not exceed 50 inch/lbs of torque on

the antenna mounting screws.

H. Apply a bead of sealant around the base of the antenna and seal the antenna mounting

screw holes to prevent water damage.

2.3.6 ELECTRICAL INSTALLATION

2.3.6.1 General Information

The KLN 94 will operate with an input voltage from 11 to 33 VDC but the front panel lighting
circuit must be wired for either +14 VDC or +28 VDC, depending upon the aircraft lighting bus.
Refer to the KLN 94 interconnect diagram for wiring details.

A. The installing facility will supply and fabricate all external cables. The required connectors are

supplied as part of the installation kit.

B. The length and routing of the external cables must be carefully planned before attempting the

actual installation. Avoid sharp bends or locating the cable near aircraft control cables.

C. The KLN 94 and associated wiring must be kept at least a minimum of 3 ft. from high noise

sources and not routed with cables from high power sources to insure optimum performance
from the system.

D. Do not route the antenna cable near any cable used for a transmitting antenna. Prior to

installing the KLN 94 itself, a point to point continuity check of the wiring harness should be
done to verify proper wiring. The aircraft power input to the unit should be made to insure that
power is applied to only the specified power pin(s).

Rev. 4, Jan/2003 10599I04.CDL Page 2-4

B KLN 94

2.3.6.2 Functional Pinout Descriptions

This section gives a brief description of some of the inputs and outputs of the KLN 89/89B. It is
provided so the installer can determine what specific wiring needs to be done to the aircraft in
which the unit is to be installed. Unless otherwise specified, pins not used are to be left open.

CONNECTOR P941

Pin 1; GENERAL RS 232 IN

Pin 1 is the RS 232 input. The KLN 94 must be configured correctly for the type of equipment (or
no equipment) connected to this input. Refer to Section 2.4.1 for the configuration procedure.

It is not necessary to connect this input to the GENERAL RS 232 OUT when this input is not
used as the “No Fuel Mgt Sys” and “No Air Data” configuration choices indicate this input is
unused and inhibit the “No RS-232 Data” message. For specific label information, refer to RS 232

Format Definitions Appendix.

Pin 2; GENERAL RS 232 OUT

The KLN 94 outputs data in RS 232 format on this pin. It can be used to interface with certain
types of ELT’s, fuel sensors, moving map displays, and fuel management systems. For specific
label information, refer to RS 232 Format Definitions Appendix.

Pin 3; DATA LOADER RS 232 IN

Pin 3 inputs Data Loader information in RS 232 format. It can be used to interface with a laptop
IBM compatible PC to load the database.

TM

Pin 4; DATA LOADER/QUICKTUNE

Pin 4 outputs Data Loader information in RS 232 format. It can be used to interface with a laptop
IBM compatible PC to load the database and to quick-tune some VHF COMM units..

Pin 5; SPARE RS 232 IN

Pin 5 is a spare RS 232 input.

Pin 6; GPS SENSOR RS 232 OUT

Pin 6 is a GPS Sensor RS 232 output; Typically used for RPGWS interface.

Pin 7; OBI SYNC

Pin 8; OBI CLOCK

Pin 9; OBI DATA

RS 232 OUT

This is a three wire data bus that provides bearing to the active waypoint. The data is in
Honeywell format and can be used to drive certain Honeywell RMI units.

Rev. 4, Jan/2003 10599I04.CDL Page 2-5

B KLN 94

The output can also be converted by a Honeywell KDA 692 which provides standard 4-wire
SINE/COSINE OBI information.

Pin 10; LATERAL DEV FLAG+

Pin 11; LATERAL DEV FLAG-

Pin 12; VERTICAL DEV FLAG+

Pin 13; VERTICAL DEV FLAG-

These are deviation flag outputs. DEV FLAG+ outputs with respect to DEV FLAG-. For the
specifications on these outputs refer to Section 1.3 of this manual.

Pin 14; A/C GROUND

Pin 14 is tied to aircraft ground. Wiring harness shields are not to be terminated on this pin. Refer
to Figure 2-17.

Pin 15; WAYPOINT ANNUNCIATE

Pin 15 is the Waypoint Alert annunciator output. This output is tied to a remote annunciator lamp.
When the line is pulled low the annunciator lamp will illuminate. The annunciator will be on
whenever waypoint alerting is occurring. For more complete information refer to the KLN 94
Pilots Guide, P/N 006-18207-0000.

Pin 16; MESSAGE ANNUNCIATE

Pin 16 is the Message annunciator output. This output is tied to a remote annunciator lamp.
When the line is pulled low the annunciator lamp will illuminate. The annunciator will be on
whenever the message prompt on the KLN 94 is on. For more complete information refer to the
KLN 94 Pilots Guide, P/N 006-18207-0000.

Pin 17; APPROACH ARM ANNUNCIATE

Pin 17 is the Approach Arm annunciator output. This output is tied to a remote annunciator lamp.
When the line is pulled low the annunciator lamp will illuminate. The annunciator will be on
whenever the unit is in the approach arm mode. For more complete information refer to the KLN
94 Pilots Guide, P/N 006-18207-0000.

Pin 18; APPROACH ACTIVE ANNUNCIATE

Pin 18 is the Approach Active annunciator output. This output is tied to a remote annunciator
lamp. When the line is pulled low the annunciator lamp will illuminate. The annunciator will be on
whenever the unit is in the approach active mode. For more complete information refer to the
KLN 94 Pilots Guide, P/N 006-18207-0000.

Pin 19; ALTITUDE ALERT ANNUNCIATE

Pin 19 is the Altitude Alert output pin. The altitude alert feature can be enabled or disabled at
installation time from the maintenance configuration pages as described in Section 2.4.1

Rev. 4, Jan/2003 10599I04.CDL Page 2-6

B KLN 94

This feature is normally disabled if another altitude alerter (selector) is already installed in the
aircraft. If altitude alerting is enabled, the pilot can choose to turn it on or off. If it is disabled, the
pilot is not able to turn it on.

Pin 20; SPARE ANNUNCIATOR 1

Pin 21; SPARE ANNUNCIATOR 2

Pins (20-21) are spare annunciator outputs.

Pin 22; ROLL STEERING VALID --This is a Roll Steering Superflag. (same logic as other
superflags.)

Pin 23; ROLL STEERING HI-- Combined with Rool Steering LO, this provides a DC Roll Steering
Command to the Autopilot

Pin 24; LIGHTING 28V/LO

Pin 25; LIGHTING 14V

The lighting bus will use the DC power input pin as lighting low. For 14 V operation, LIGHTING
28V/LO is connected to ground and LIGHTING 14V is connected to the 14 V panel lighting bus.
For 28 V operation, LIGHTING 28V/LO is connected to the 28 V panel lighting bus and
LIGHTING 14V is not connected.

CONNECTOR P942

Pin 1; TEST

Pin 1, when grounded on power-up, will place the unit in the test mode. Once in the test mode,
the unit will remain in that mode until power to the unit is turned off. Test mode is provided to
assist in manufacturing and field service troubleshooting.

Pin 2; TAKE HOME

Pin 2, when grounded, places the KLN 94 in Take-Home mode which is used for trip planning and
flight simulation. It performs as if it is receiving adequate GPS signals to determine its position. It
displays the latitude and longitude of its last known position or of whatever position it is initialized
to on the Setup Page. Pin 2 should always be left open in the aircraft installation. Take-Home
mode must not be allowed during actual flight.

Pin 3; SPARE IN 1
Pin 4; SPARE IN 2
Pin 5; SPARE IN 3
Pin 6; ROLL STEERING LO-- Combined with Roll Steering HI provides a DC Roll Steering
Signal.
Pin 7; SPARE IN 0
Pin 8; APPROACH ARM IN

Pin 8 is used as a select input. If the installation is not certified for approach, the external switch/
annunciator is not needed.

Rev. 4, Jan/2003 10599I04.CDL Page 2-7

B KLN 94

If the installation is approved for approach and the external switch/annunciator is installed, then a
momentary ground on pin 8 will alternately arm or disarm the approach mode.

Pin 9; LATERAL SUPER FLAG

Pin 10; VERTICAL SUPER FLAG

On superflag outputs, a logic high shall be
logic high shall be
VDC when the voltage at pin 19 is + 27.5 VDC. A logic low shall be

Pin 11; LATERAL DEV +L
Pin 12; LATERAL DEV +R
Pin 13; VERTICAL DEV +UP
Pin 14; VERTICAL DEV +DOWN

These pins are deviation outputs and function as differential pairs. For the specifications on these
outputs, refer to Section 1.3 of this manual.

Pin 15; ALTITUDE ALERT AUDIO
Pin 16; ALTITUDE ALERT AUDIO LO

These pins represent the Altitude Alert Audio output, which is active whenever ALTITUDE ALERT
ANNUNCIATE is active.

Pin 17; FCS LOC ENG

This annunciator is active when the lateral deviation scale factor is 0.3 nm. It is also active while
the scale is transitioning from 1.0 nm down to 0.3 nm.

≥ 10 VDC when the voltage at pin 19 is ≥ 12.4 VDC. A logic high shall be ≥ 20

≥ 18 VDC when the voltage at pin 19 is ≥ 24.8 VDC. A

≤ 3.5 VDC.

Pin 18; A/C POWER MONITOR

Pin 18 is the aircraft power monitor. It senses voltages ranging from 0 to 33 V. The KLN 94 can be
configured to allow the selection of a voltage alert set point and a voltage alert delay interval for
use with this input. Refer to Section 2.4.1 for the configuration procedure. The “Low Bus Voltage,
Check Charging System” message is displayed when voltage at this pin is below the voltage alert
set point for greater than the voltage alert delay interval.

Pin 19; 11-33 VDC A/C POWER

Pin 19 is the DC aircraft power input. The KLN 94 will accept from 11 VDC to 33 VDC input
power.

Pin 20; A/C GROUND

Pin 20 is tied to aircraft ground. Wiring harness shields are not to be terminated on this pin. Refer
to Figure 2-17.
Pin 21; D4
Pin 22; A1
Pin 23; A2
Pin 24; A4

Rev. 4, Jan/2003 10599I04.CDL Page 2-8

B KLN 94

Pin 25; B1
Pin 26; B2
Pin 27; B4
Pin 28; C1
Pin 29; C2
Pin 30; C4

These pins are gray code altitude inputs from an encoding altimeter. If the KLN 94 is paralleled
with another unit such as a transponder, it may be necessary to install isolation diodes between
one or both units and the encoder. The KLN 94 has diodes already installed internally.

Pin 31; GPS DISPLAYED

This pin is used as an input to tell the unit whether an external indicator is connected to the
analog OBS resolver inputs, in which case it will be high. This pin will be grounded if an indicator
is not connected or coupled to the unit.

Pin 32; +TO
Pin 33; +FROM

These outputs function like the outputs from standard navigation converters. For the
specifications on these outputs, refer to Section 1.3 of this manual.

Pin 34; OBS OUT
Pin 35; OBS SIN
Pin 36; OBS COS
Pin 37; OBS RETURN

These pins are the OBS Resolver Interface. This interface is compatible with indicators that are
electrically zeroed (EZ) at 300 degrees and indicators that are omni-ranged zero at 300 degrees.
This interface will operate properly with either “0.85 gain” resolvers or “0.41 gain” resolvers with
no special programming requirements. OBS Resolver Out is a 450 Hz output used to excite the
resolver. The resolver output voltage is then received by the OBS Resolver sine and cosine
inputs.

CONFIGURATION MODULE

The configuration module is a separate module from the main rear I/O connector. It is a serial
EEPROM containing at least 32 bytes or 16, 16 (sixteen) 16-bit words.of capacity.

Rev. 4, Jan/2003 10599I04.CDL Page 2-9

B KLN 94

P941

1 ← --------------------------- GENERAL RS 232 IN

2 --------------------------- → GENERAL RS 232 OUT

3 ← --------------------------- DATA LOADER RS232 IN

4 --------------------------- →

5 ← --------------------------- SPARE RS 232 IN

6 --------------------------- → GPS SENSOR RS 232 OUT

7 --------------------------- → OBI SYNC

8 --------------------------- → OBI CLOCK

9 --------------------------- → OBI DATA

10 --------------------------- → LATERAL DEV FLAG +

11 --------------------------- → LATERAL DEV FLAG -

12 --------------------------- → VERTICAL DEV FLAG +

13 --------------------------- → VERTICAL DEV FLAG -

14 ← --------------------------- A/C GROUND

15 --------------------------- → WAYPOINT ANNUNCIATE

16 --------------------------- → MESSAGE ANNUNCIATE

17 --------------------------- → APPROACH ARM ANNUNCIATE

18 --------------------------- → APPROACH ACTIVE ANNUNCIATE

19 --------------------------- → ALTITUDE ALERT ANNUNCIATE

DATA LOADER/QUICKTUNE

TM

RS 232 OUT

20 --------------------------- → SPARE ANNUNCIATE 1

21 --------------------------- → SPARE ANNUNCIATE 2

22 --------------------------- → ROLL STEERING VALID

23 --------------------------- → ROLL STEERING HI

24 ← --------------------------- → LIGHTING 28V/LO

25 ← --------------------------- → LIGHTING 14V

INPUTS OUTPUTS →

←

Figure 2-1 KLN 94 P941 CONNECTOR PIN FUNCTIONS

Rev. 4, Jan/2003 10599I04.CDL Page 2-10

B KLN 94

P942

1 ← --------------------------- TEST

2 ← --------------------------- TAKE HOME

3 ← --------------------------- SPARE IN 1

4 ← --------------------------- SPARE IN 2

5 ← --------------------------- SPARE IN 3

6 --------------------------- → ROLL STEERING LO

7 ← --------------------------- SPARE IN 0

8 ← --------------------------- APPROACH ARM IN

9 --------------------------- → LATERAL SUPER FLAG

10 --------------------------- → VERTICAL SUPER FLAG

11 --------------------------- → LATERAL DEV +L

12 --------------------------- → LATERAL DEV +R

13 --------------------------- → VERTICAL DEV +UP

14 --------------------------- → VERTICAL DEV +DOWN

15 --------------------------- → ALTITUDE ALERT AUDIO

16 --------------------------- → ALTITUDE ALERT AUDIO LO

17 --------------------------- → FCS LOC ENG

18 ← --------------------------- A/C POWER MONITOR

19 ← --------------------------- 11-33 VDC AC POWER

20 ← --------------------------- A/C GROUND

21 ← --------------------------- D4

22 ← --------------------------- A1

23 ← --------------------------- A2

24 ← --------------------------- A4

INPUTS OUTPUTS →

←

Figure 2-2 KLN 94 P942 CONNECTOR PIN FUNCTIONS

(Sheet 1 of 2)

Rev. 4, Jan/2003 10599I04.CDL Page 2-11

B KLN 94

P942

25 ← --------------------------- B1

26 ← --------------------------- B2

27 ← --------------------------- B4

28 ← --------------------------- C1

29 ← --------------------------- C2

30 ← --------------------------- C4

31 ← --------------------------- GPS DISPLAYED

32 --------------------------- → +TO

33 --------------------------- → +FROM

34 --------------------------- → OBS OUT

35 ← --------------------------- OBS SIN

36 ← --------------------------- OBS COS

37 --------------------------- → OBS RETURN

INPUTS OUTPUTS →

←

Figure 2-2 KLN 94 P942 CONNECTOR PIN FUNCTIONS

(Sheet 2 of 2)

Rev. 4, Jan/2003 10599I04.CDL Page 2-12

B KLN 94

P943

1 --------------------------- → EXT_EEPRM_CS

2 ← --------------------------- EXT_EEPRM

3 ← --------------------------- TMCP_ENABLEn

4 --------------------------- → +5 V

5 ← --------------------------- RTI_TAKEHOME_ENABLEn

6 ← --------------------------- TMCP_IN

A --------------------------- → SERIAL OUT

B ← --------------------------- SERIAL_IN

C ← --------------------------- SERIAL_CLK

D --------------------------- GROUND

E --------------------------- GROUND

F --------------------------- → TMCP_OUT

INPUTS OUTPUTS →

←

Figure 2-3 KLN 94 P943 CONNECTOR PIN FUNCTIONS

Rev. 4, Jan/2003 10599I04.CDL Page 2-13

B KLN 94

FIGURE 2-4 CRIMPING AND INSERTION/EXTRACTION TOOLS

Rev. 4, Jan/2003 10599I04.CDL Page 2-14

B KLN 94

FIGURE 2-5 KLN 94 INSTALLATION DRAWING
Dwg. No. 155-06020-0000 Rev. AC

Rev. 4, Jan/2003 10599I04.CDL Page 2-15

B KLN 94

FIGURE 2-6 KA 91 OUTLINE

Dwg. No. 071-01545-0200 Rev. 4

Rev. 4, Jan/2003 10599I04.CDL Page 2-17

B KLN 94

THIS PAGE IS RESERVED.

Rev. 4, Jan/2003 10599I04.CDL Page 2-18

B KLN 94

FIGURE 2-7 KA 91 INSTALLATION DRAWING

Dwg. No. 155-05999-0000 Rev. 5

Rev. 4, Jan/2003 10599I04.CDL Page 2-19

B KLN 94

FIGURE 2-8 KA 91 BACKPLATE OUTLINE
Dwg. No. 155-10130-0000/0002 Rev. 2

Rev. 4, Jan/2003 10599I04.CDL Page 2-21

B KLN 94

FIGURE 2-9 KA 92 OUTLINE

Dwg. No. 071-01553-0200 Rev. AB

Sheet 1 of 3

Rev. 4, Jan/2003 10599I04.CDL Page 2-23

B KLN 94

FIGURE 2-9 KA 92 OUTLINE

Dwg. No. 071-01553-0200 Rev. AB

Sheet 2 of 3

Rev. 4, Jan/2003 10599I04.CDL Page 2-24

B KLN 94

NOTES

1. For best performance, electrical bond between aircraft and antenna should be less than 10

milliohms measured from TNC connector to aircraft skin.

2. Antenna to be mounted with four 8-32 x 3/4 inch long Pan Head phillips stainless steel

screws (Honeywell P/N 089-05909-0012).

3. Serial tags to be vendor supplied in accordance with Honeywell P/N 057-05753-0000 and

Comant P/N B40585-1.

4. Airspeed Rating: 600 knots TAS maximum.

5. Antenna to be installed with installation kit Honeywell part number 050-03318-0000.

6. Antennas to be bulk packaged as per good commercial practice.

7. Finished antenna assembly to be tested utilizing Honeywell Test Chamber 190-2361-XX or

equivalent, and CHU Associates source antenna model CA3224, or Tecom Model
401163-2.

FIGURE 2-9 KA 92 OUTLINE

Dwg. No. 071-01553-0200 Rev. AB

Sheet 3 of 3

Rev. 4, Jan/2003 10599I04.CDL Page 2-25

B KLN 94

THIS PAGE IS RESERVED

Rev. 4, Jan/2003 10599I04.CDL Page 2-26

B KLN 94

FIGURE 2-10 KA 92 INSTALLATION DRAWING

Dwg. No. 155-06019-0000 Rev. 2

Rev. 4, Jan/2003 10599I04.CDL Page 2-27

B KLN 94

FIGURE 2-11 KA 92 BACKPLATE OUTLINE

Dwg. No. 047-10735-0000 Rev. 1

Rev. 4, Jan/2003 10599I04.CDL Page 2-29

B KLN 94

FIGURE 2-12A KA 91/92 TNC ANTENNA COAX / CONNECTOR ASSEMBLY

(RG142B/U or RG400 - 0 to 40 FEET)

(Straight Connector P/N 030-00134-0000)

Rev. 4, Jan/2003 10599I04.CDL Page 2-31

B KLN 94

FIGURE 2-12B KA 91/92 TNC ANTENNA COAX / CONNECTOR ASSEMBLY

(RG142B/U or RG400 - 0 to 40 FEET)

(Right-Angle Connector P/N 030-00134-0001)

Rev. 4, Jan/2003 10599I04.CDL Page 2-32

B KLN 94

FIGURE 2-13 KA91/92 BMA ANTENNA COAX/CONNECTOR ASSEMBLY

(RG142 B/U or RG400 - 0 to 40 FEET)

Rev. 4, Jan/2003 10599I04.CDL Page 2-33

B KLN 94

FIGURE 2-14 KA 91/92 TNC ANTENNA COAX / CONNECTOR ASSEMBLY

0 to 80 FEET / 0 to 100 FEET

(For Cable P/Ns 024-00071-0000 Rev. 0 / 024-00072-0000 Rev. 0)

Rev. 4, Dec/2002 10599I04.CDL Page 2-35

B KLN 94

THIS PAGE IS RESERVED.

Rev. 4, Dec/2002 10599I04.CDL Page 2-36

B KLN 94

FIGURE 2-15 KA 33 P/N 071-4037-00 /01 FINAL ASSEMBLY

Dwg. No. 300-03256-0000 Rev. AA

Rev. 4, Jan/2003 10599I04.CDL Page 2-37

B KLN 94

FIGURE 2-16 KA 33 P/N 071-4037-00/01 OUTLINE AND MOUNTING

Dwg. No. 155-05574-0000 Rev. 5

Rev. 4, Jan/2003 10599I04.CDL Page 2-39

B KLN 94

FIGURE 2-17 CUTLER-HAMMER SWITCH / ANNUNCIATOR MOUNTING

Rev. 4, Jan/2003 10599I04.CDL Page 2-41

B KLN 94

FIGURE 2-18 CUTLER-HAMMER SWITCH / ANNUNCIATOR INTERNAL SCHEMATIC

Sheet 1 of 2

Rev. 4, Dec/2002 10599I04.CDL Page 2-43

B KLN 94

THIS PAGE IS RESERVED.

Rev. 4, Dec/2002 10599I04.CDL Page 2-44

B KLN 94

FIGURE 2-18 CUTLER-HAMMER SWITCH / ANNUNCIATOR INTERNAL SCHEMATIC

Sheet 2 of 2

Rev. 4, Dec/2002 10599I04.CDL Page 2-45

B KLN 94

FIGURE 2-19 KLN 94 SERIAL RECEIVERS & TRANSMITTERS INTERCONNECT

Dwg. No. 155-01732-0000 Rev. B

Rev. 4, Jan/2003 10599I04.CDL Page 2-47

B KLN 94

FIGURE 2-20 KLN 94 ALTITUDE & RMI / OBI INTERCONNECT

Dwg. No. 155-01732-0001 Rev.-

Rev. 4, Jan/2003 10599I04.CDL Page 2-49

B KLN 94

FIGURE 2-21 KLN 94 DEVIATION & FLAGS INTERCONNECT

Dwg. No. 155-01732-0002 Rev.-

Rev. 4, Jan/2003 10599I04.CDL Page 2-51

B KLN 94

FIGURE 2-22 KLN 94 OBS RESOLVER INTERCONNECT

Dwg. No. 155-01732-0003 Rev.­ Sheet 1 of 2

Rev. 4, Jan/2003 10599I04.CDL Page 2-53

B KLN 94

FIGURE 2-23 KLN 94 INTERCONNECT

Dwg. No. 155-01732-0003 Rev.-

Sheet 2 of 2

Rev. 4, Jan/2003 10599I04.CDL Page 2-55

B KLN 94

FIGURE 2-24 KLN 94 FCS & EXT. ANNUNC. INTERCONNECT

Dwg. No. 155-01732-0004 Rev. A

Rev. 4, Jan/2003 10599I04.CDL Page 2-57

B KLN 94

FIGURE 2-25 KLN 94 BACKLIGHTING & ALT. ALERTING INTERCONNECT

Dwg. No. 155-01732-0005 Rev.-

Rev. 4, Jan/2003 10599I04.CDL Page 2-59

B KLN 94

FIGURE 2-26 KLN 94 PC LOADER & ANTENNA INTERCONNECT

Dwg. No. 155-01732-0006 Rev.-

Rev. 4, Jan/2003 10599I04.CDL Page 2-61

B KLN 94

FIGURE 2-27 KLN 94 DATA LOADER / PC INTERFACE

Rev. 4, Jan/2003 10599I04.CDL Page 2-63

B KLN 94

FIGURE 2-28 KLN 94 QUICKTUNE INTERCONNECT

Dwg. No. 155-01732-0007 Rev.-

Rev. 4, Jan/2003 10599I04.CDL Page 2-65

B KLN 94

2.4 POST INSTALLATION CHECK OUT INFORMATION

2.4.1 Maintenance Pages

As part of every KLN 94 installation it is necessary to enter the Maintenance (MNT) pages in
order to configure the unit properly for the specific installation. Electronically configuring the units
replaces the need of installing strapping or configuration wires in the harness. This makes it
easier to configure the unit at the time of initial installation and also later on if changes are made
to the aircraft such as the later addition of a fuel management system, air data system, or
reconfigure from VFR to IFR.

This configuration data is stored both in the external configuration module (mounted in the back
plate of the mounting tray) and in memory internal to the KLN 94. When the KLN 94 is initially
shipped from the factory, the configuration data is set to the same default values/status in both
the external configuration module and the units internal memory. The initial defaults are specified
below. When the Maintenance pages are entered and changes made to the configuration data,
the changes are stored both in the external configuration module and the internal memory. If the
configuration data differs in the external configuration module from the units internal memory, the
external configuration module data is automatically used. Differences could occur if after
configuring the KLN 94 the initial unit was removed and a second unit inserted into the rack. For
example, if the KLN 94 is initially configured correctly and a loaner unit is later installed in the
aircraft, the external configuration module would ensure that the proper configuration data was
used. The external configuration module is part of the installation kit and should be utilized in
every installation to make sure that proper operation occurs regardless of the unit that may later
be inserted into the mounting tray.

To enter the Maintenance pages, the MSG button must be depressed before the unit is turned
and held. Hold the MSG button down and watch for a flash in the "Earth with Satellites" picture.
Continue to depress the MSG button for 10 seconds (+- 2 seconds) after the flash of the "Earth
with Satellites". During that 10 seconds, you will see the picture change from monochrome to
color. At the end of the 10 second period, release the MSG button for 1 second and momentarily
press the MSG button again. After about a 15 second period the "Earth with Satellites" picture
will change to a MNT Page. After entering the Maintenance pages if the configuration data is
different between the external module and the units internal memory, the following page is
displayed (this page will not be displayed if they are the same):

CONFIGURATION

1. Copy Module to Unit?

2. Copy Unit to Module?

Select: 1

If you wish to copy the configuration data from the external configuration module to the unit’s
internal memory or if you plan to manually change the configuration data, simply press the ENT
button.

If you wish to copy the configuration data from the unit’s internal memory to the external module,
turn the large outer knob counterclockwise to position the flashing cursor over the 1. Turn the
small inner knob to select a 2. Turn the large outer knob one step clockwise to position the cursor
back over the OK? and then press the ENT button.

OK?

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B KLN 94

2.4.1.1 Maintenance 1 (MNT 1) Pages

The MNT+1 page is now displayed. There are three MNT+1 pages. The + sign indicates that
there is more than one MNT 1 page. The first MNT 1 page has the following selection choices
and format:

1.Whether the unit is certified as IFR or VFR.

2.Whether the unit is certified for IFR enroute/terminal use only or for both enroute/terminal and

non-precision approach.

3.Whether the altitude alerting feature is enabled or disabled. If the aircraft has another source of

altitude alerting such as that associated with a flight control preselector, this feature should be
disabled.

First MNT +1 Page Format Selection Choices Default

IFR/VFR: IFR IFR or VFR VFR

IFR Apr/Enr: Apr Apr or Enr (blank if line one above is VFR) Enr

ALT alt: Enabled Enabled or Disabled Disabled

To change a selection:

Press the CRSR button to bring the flashing cursor on the screen. Turn the larger outer knob to
position the cursor over the desired selection. Turn the small inner knob to change the selection.
Make any additional changes on this page at this time. When finished, press the CRSR button to
turn off the cursor.

To select different MNT pages:

Turn the small inner knob (the flashing cursor must be off the page. If it is on, press the CRSR
button to turn it off). Select the second MNT+1 page.

The second MNT+1 page has the following selection choices and format. Changes are made
using the CRSR button and concentric knob as described above.

1.Whether the KLN 94 is interfaced with a fuel management system.

2.Whether the fuel management system includes it own control/indicator used to enter fuel

quantity. (Not a choice if there is no fuel management system).

3.What is the full fuel quantity of the aircraft. (Not a choice if there is no fuel management system

or if the fuel management system has its own control/indicator used to enter fuel quantity).

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B KLN 94

Second MNT +1 Page Format Selection Choices Default

Installed Equipment

Fuel Mgt Sys: Y Y or N for yes or no N

Fuel Mgt Ind: N Y or N

(this line blank if N is selected above)

Full Fuel: 0064 0000 to 9999

(this line blank if no fuel mgt sys or if fuel
mgt sys has its own control/indicator)

The third MNT+1 page has the following selection choices and format.

1.Whether the KLN 94 is installed with an air data computer.

2.Whether the KLN 94 is installed with a back-up emergency battery (not available from

Honeywell).

3.Below what aircraft bus voltage should the back-up battery be used. (Not a choice if there is no

emergency battery).

Third MNT +1 Page Format Selection Choices Default

Installed Equipment

N

0000

232 Air Data: Y Y or N for yes or no N

Emerg Bat: Y Y or N for yes or no N

Use Bat: 10.2 V 0-33 V (this line blank if no emerg bat) 10.2 V

2.4.1.2 Maintenance 2 (MNT 2) Page

The MNT 2 page displays total hours of operation and number of power cycles on the KLN 94
and is not configurable.

2.4.1.3 Maintenance 3 (MNT 3) Page

The MNT 3 page is used to calibrate the OBS setting of the aircraft’s HSI or CDI to the KLN 94 so
that the KLN 94 reads the value the pilot selects on the HSI or CDI. It is necessary to configure
this page only if the KLN 94 is interfaced to an HSI or CDI resolver such that the KLN 94 is able
to read the course selected on the HSI or CDI. To calibrate the OBS:

1.Select a course using the course select/OBS knob on the HSI or OBS that is interfaced with the

KLN 94. It is suggested that a course increment of 10 degrees (example 10,150, 270, etc.) be
used so that the course can be selected as precisely as possible.

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B KLN 94

2.Press the CRSR button to turn on the cursor.

3.Use the small inner knob to select the exact course that is selected on the HSI or CDI in step 1

above.

4.Adjust the HSI or CDI to another course which is not 180× away from the original course, and

verify the correct course is displayed within 2×. If not, the OBS resolver interface may be
miswired.

5.Press the CRSR button to turn off the cursor. The calibration is now complete.

2.4.1.4 Maintenance 4 (MNT 4) Page

The MNT 4 page is used to set the bus monitor voltage and alert delay so that if the aircraft’s
charging system were to fail (i.e. generator/alternator failure) the pilot would be given timely
notification of the failure. The alert delay is selected so that momentary voltage drops which
could be caused by such things as cycling the aircraft’s gear or flaps do not cause nuisance
notifications to the pilot. When the bus voltage falls below the selected alert voltage for the
selected alert delay time the unit notifies the pilot with the following message that is displayed on
the message page:

Low Bus Voltage
Check Charging System

This Power Monitor feature can be turned on and off by the pilot on the SET 9 page but actual
configuration can only be done from the MNT 4 page. The SET 9 page displays to the pilot the
actual bus voltage to the KLN 94 as well as the alert voltage and alert delay that have been
configured on the MNT 4 page. Changes are made to the MNT 4 page using the CRSR button
and the concentric knobs as described in Section 2.4.1.1.

The MNT 4 page has the following format and choices:

MNT 4 Page Format Selection Choices Default

Bus Monitor

Alert Volt 12.8 V 0.0 - 33.0 V 10.0 V

Alert Delay 15 S 0 - 99 seconds 15 S

The following procedure is suggested as a means of determining what voltage to use for the alert
voltage. Cycle power to the KLN 94 to exit the Maintenance pages. View the SET 9 page to
determine the actual voltage being supplied to the KLN 94 while the engine is running
(alternator/generator supplying the bus voltage). You may want to do this with the engine at idle
so that you see the lowest possible voltage supplied by the alternator/ generator. Next, determine
the actual voltage being supplied to the KLN 94 when only the battery is supplying the voltage
(alternator/generator turned off or engine not running).

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B KLN 94

The alert voltage should be chosen to be about half way between these two voltages. For
example, in a 14 volt aircraft say the alternator supplied voltage is 13.8 volts as displayed on the
SET 9 page with the engine running. The battery supplied voltage with the engine not running is

12.0 volts. An appropriate alert voltage in this case would be 12.9 volts. If an alternator were to

fail in flight and the voltage drop to 12.0 volts for at least 15 seconds (or whatever alert delay time
was selected), the pilot would be notified of the problem.

NOTE

In order to prevent nuisance messages, this feature should be disabled (Alert
Volt OFF) on the SET 9 page on aircraft where the alternator/generator output
drops down to a voltage close to the battery voltage during engine idle.

When the maintenance pages are configured as desired, it is necessary to cycle power to the
unit in order to leave the maintenance pages and allow normal operation.

2.4.1.5 Maintenance 5 (MNT 5) Page

The MNT 5 page is used to configure the Quicktune outputs of the KLN 94. The COMM
frequencies stored in the KLN 94 may be sent to up to 4 COMMs that recognize the Quicktune
labels transmitted over the RS232 bus. The Bendix/King KX155A and KX165A are examples of
such a radio.

Similarly, the NAV frequencies stored in the KLN 94 may be sent to up to 4 NAV radios. If a
Quicktune compatible COMM or NAV is assigned in the KLN94 MNT 5 page (i.e. COMM-2, and
NAV-1), then the specific COMMs and NAVs must be configured themselves with the same
identifier. For the specific procedure on how to assign an identifier to a KX155A, refer to section

3.1.4.3 of the KX155A Installation Manual.

If a radio number is assigned in the KLN94, a similar operation must be performed in the radio. In
other words, if COMM-2 is assigned in the KLN94 as being a valid output, the KX155A (or other
Quicktune-valid receiver) must be configured to accept Quicktune frequencies and identified
as “COMM2”.

If an installation allows more than one Quicktune radio (i.e. two or more KX155A), it is not
necessarily recommended that both radios should be configured for Quicktune operation, but
rather consult with the owner and ask for the owner’s recommendation. If only one valid
Quicktune COMM radio is chosen in the MNT 5 page, when the user sets the CRSR over a
COMM frequency and presses ENT, the frequency will automatically be placed in the STANDBY
slot of the radio. On the other hand, if two or more valid Quicktune COMMs are chosen in the
MNT 5 page, after pressing ENT on a COMM frequency, the user will be asked to which radio
that frequency should be sent. While it increases flexibility, this could be considered a nuisance.

When the installation is complete, the user will be able to choose the default Quicktune radios
for both COMM and NAV on the SET 14 page. Consult the KLN94 Pilot’s Guide for additional
information.

2.4.1.6 Maintenance 6 (MNT 6) Page

The MNT 6 page allows the installer to change the nomenclature of the internal annunciators of
the KLN94, shown on the right hand side of the KLN94 display.

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B KLN 94

There are only two combinations allowed. The choices are shown below.

MNT 5 Page Format Choice 1 Choice 2 Default Settings

Annun: APR ARM TERM APR ARM

APR ACTV APR APR ACTV

If the KLN94 is meant to replace an existing KLN89B and there is already an installation with
external annunciators that display “APR ARM” and “APR ACTV”, then the same combination
must be chosen in the MNT 6 page in order to have conformity throughout the aircraft. This will
also allow the installer to keep the existing external annunciators and switches in place.
In a new KLN 94 installation, the external annunciators may not be required. In this case, the user
may prefer “choice 2” since it is shorter and more descriptive.

2.4.1.7 Maintenance 7 (MNT 7) Page

The MNT 7 page allows the installer to select between the Standard RS232 Serial Output and
the Enhanced RS232 Serial Output. The Enhanced RS232 bus will only work with the
Bendix/King Skyforce KMD550 Multifunctional Display, at the time of publication of this manual.

In an installation of the KLN94 with a KMD550 also has additional moving map equipment, the
standard RS232 should be chosen, as it will be able to drive a minimal subset of labels in the
KMD550 as well as additional equipment.

If you see no published interconnect for your MFD or Moving Map Display, consult the
manufacturer for installation information.

2.4.1.8 Maintenace 8 (MNT 8) Page

A Configuring the KLN 94 to operate without roll steering.

1. Select MNT 8 page.

2. Push CRSR button. The cursor will appear over the second line.

3. Select “None” and push CRSR again. The screen should look like:

Configuration
Module

DC Roll Steering
None

MNT 8

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B KLN 94

B. Configuring the KLN 94 to operate with KFC 225 (attitude-based flight control system):

1. Select MNT 8 page.

2. Push CRSR button. The cursor will appear over the second line.

3. Select “Bank Angle” and push CRSR again. The screen should look like:

Configuration
Module

DC Roll Steering
Bank Angle

MNT 8

C. Configuring the KLN 94to operate with KAP 140 (turn-rate-based flight control system):

1. Select MNT 8 page.

2. Push CRSR button. The cursor will appear over the second line.

3. Select “Turn Rate”. “Max Turn Rate” should appear on the fourth line.

4. Turn the outer knob once. The cursor should move to the bottom line.

5. Dial in the autopilot’s maximum turn rate. For KAP 140 as of 7/17/2002, it is 2.7
degrees per second.

6. Push the CRSR agin. The screen should look like:

Configuration
Module

DC Roll Steering
Turn Rate

Max Turn Rate

MNT 8

2.7 dps

2.4.2 POST INSTALLATION CHECKOUT PROCEDURE

This procedure is divided into two major sections. The first section deals with “Stand Alone”
installations in which none of the signal Input/Output capability of the unit is utilized, (except for
the RF input signal from the antenna). In this type of installation the only connections to the KLN
94 are the cable from the GPS antenna, the aircraft power and ground leads, and the lighting bus
wires.

NOTE

All output data is read from the unit front panel display and all input to the unit

is via the front panel controls.

The second part of this procedure deals with an installation in which some or all of the electrical
signal I/O have been utilized. This second section is divided in such a way that each input or
output signal is treated separately, and hence only those subsections that apply to a given
installation will be conducted.

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B KLN 94

It is assumed that the operator’s manual for the various units connected to the KLN 94 (as well as
the manual for the KLN 94 itself), are available or that the installer is familiar with operating the
units.

2.4.3 INSTALLATION CHECK OUT

Before inserting the unit into the mounting rack, verify that at the rear connector of the mounting
rack, aircraft power is present on P942 pin 19, and that there is a ground on P941 pin 14 and
P942 pin 20. In installations using 28 V lighting, lighting bus voltage should be present between
P941 pins 24 and 14. In installations using 14 V lighting, lighting bus voltage should be present
between P941 pins 25 and 14. Verify that there are no voltages or grounds present on any other
pins of P941 and P942.

A.Verify that aircraft power is OFF or the unit circuit breaker is pulled. Making sure that the power
On/Off switch, located on the front panel of the KLN 94 is rotated the “off” position (power off),
plug the unit into the mounting rack and verify that the panel lighting works properly.

B.Energize the unit by rotating the power control switch to the “on” position.

C.Manipulate the controls as necessary to display the Set 1 Page on the right half of the screen.
On the Set 1 Page, enter the airport name or the present position (latitude and longitude) for the
installation location accurate to within 60 nautical miles. Display the Set 2 Page. Verify that the
date and time are correct to within 10 minutes and update if necessary.

D.At this point the aircraft will have to be moved to a location known to have reasonable GPS
signal coverage. This implies an outside location away from tall structures that could mask low
elevation satellites. (To speed up the next test it is helpful to turn unit power off then on again
once the system is away from structures).

E.Proceed to the AUX 1 page. The State shown on the display should change to Acquire (ACQ)
from INIT and after a period of not more than 5 minutes, (typically two minutes depending upon
the satellite coverage), the unit should display Latitude and Longitude values on the Nav 2 Page
that are correct for the installation location. If the unit has not been turned on for 6 months, the
unit will take up to 20 minutes to calculate a position.

F.Select the AUX 2 page, verify that no asterisks appear next to any satellite with an elevation
greater than 25°. Select 121.15 MHz on COMM 1. Transmit on COMM 1 for a period of 20
seconds and verify that no asterisks appear indicating satellites with an elevation of greater than
25°. Repeat for the following frequencies: 118.000, 120.925, 121.175, 121.200, 123.825,

127.100, 130.625, 131.250, 131.275 131.300 and 134.150 MHz. Repeat the above procedure for
all VHF COMM’s on board the aircraft.

If any of the above tests do not pass (any asterisks appear on satellites with greater than 25°
during the above tests), it will be necessary to identify the source of the interference. There are
two common sources of interference:

1.The 12th and 13th harmonics of the above mentioned frequencies can be radiated from the
VHF COMM at a level strong enough to be a problem to the GPS but still be well low enough to
meet TSO/JTSO requirements for the VHF COMM.

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B KLN 94

If the interference is from the radiating VHF COMM, an optional notch filter (i.e. the KA 198 P/N
071-01565-0000 or TED Mfg 4-70-54) will need to be installed. The recommended location for
the inline filter should be as close to the VHF RT as practical.

NOTE

The conditions and tests performed on this article are minimum performance
standards. It is the responsibility of those desiring to install this article either
on or within a specific type or class of aircraft to determine that the aircraft
installation conditions are within these performance standards. The article
may be installed only if further evaluation by the applicant documents an
acceptable installation and is approved by the Administrator.

2.The other possibility is re-radiation from an ELT. The radiated RF from the VHF COMM can
excite the output tank circuit of the ELT and cause it to oscillate and radiate RF strong enough to
interfere with the GPS. If disconnecting the ELT antenna eliminates the GPS interference, the
manufacturer of the ELT should be contacted for a recommended solution.

G.Select the AUX 14 page and verify that the first line of that page on the unit display screen
reads as follows:

SW REVISION 0X0X

(where 0X0X is the last four digits of the KLN 94 Application Software 206- number)

An entry must be made in the aircraft log book upon installation of the KLN 94, indicating the
applicable software revision level. The recommended log book wording is as follows:

KLN 94 Application Software is at SW REVISION 0X0X on DD MMM YYYY.

(where 0X0X represents the last four digits of the KLN 94 Application Software 206- number

and DD MMM YYY represents the Day, Month and Year of the installation)

2.4.4 INTEGRATED INSTALLATION CHECK OUT

The following paragraphs define checkout procedures for all possible Input/Output signals that
can be connected to the KLN94. It should be clearly determined which of the signals are
intended to be used in any given installation and then only the paragraphs pertaining to those
signals should be performed.

2.4.4.1 All Installations

Perform all steps defined in Paragraph 2.4.3 and leave the system energized with a valid GPS
signal being received.

2.4.4.2 CDI/HSI Interface

Cycle the power on the KLN94, which will cause the self-test page to be displayed. Verify that the
CDI needle, after it has settled, is indicating half scale right deflection.

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B KLN 94

Verify that the TO/FROM flag is indicating FROM. Verify that the nav flag is pulled from view.
Verify that the selected course from the CDI/HSI is interfaced properly to the KLN 94 in the OBS
Mode. The OBS value on the third line of the self-test page should match the selected course on
the CDS/HSI and be with satellite coverage or in take-home mode.

You must create an active waypoint on the Flightplan 0 page to check the following function. The
OBS/LEG selection is controlled through the OBS button located on the front panel of the KLN

94. Pressing this button toggles between DTK and OBS with the normal position being DTK.
During OBS mode, the DTK indication (located left of the vertical page divider) will change to a
three digit course value.

Verify that the selected course value agrees with the value displayed on the HSI Course Pointer.
Change the selected course value on the HSI or CDI using the OBS knob. Verify that the selected
course value displayed on the KLN94 tracks the new value selected. In the OBS mode with the
GPS displayed on the CDI/HSI, the resolver is disconnected from the NAV converter. Verify that
the KNS 80 or 81 groundspeed is still functional and the Radial display for the KX 165 or KNS 81
is still functional. These units must have jumpers or resistors across them when the resolver is
removed.

In the OBS mode with the GPS not displayed on the CDI/HSI, the resolver is reconnected to the
NAV converter. Verify that change in the OBS resolver will not affect the selected OBS on the
KLN 94.

2.4.4.3 Gray Code Altitude Inputs

With gray code altitude being supplied by a compatible encoding altimeter, verify that the proper
altitude is indicated on the ALT page (provided no other altitude sources are active and that
proper baro setting has been entered).

Verify that there is no interference between the KLN 94, transponder, and any other loads on the
encoding altimeter output. Remove power from each of the loads on the encoder to verify that the
remaining equipment still performs properly. If interference exists, one or more of the units are
not diode isolated and isolation diodes will need to be added to the aircraft wiring.

2.4.4.4 RMI Interface

Cycle power on the KLN 94 which will cause the self test page to be displayed. Verify that the
RMI indicates 130°.

2.4.4.5 ELT Interface

The following test must be conducted within five minutes after the hour with ELT transmissions
limited to 3 (Three) sweeps. A sweep occurs each time there is a voice transmission. Verify that
the present position is displayed on the KLN 94 Nav 2 page. Activate the Comm Receiver and
tune it to 121.5 MHz. Switch the ELT cockpit toggle switch to TEST. The ELT light should flash
and the “sweeping” sound of the ELT should be heard on the Comm Receiver.

Within 1 (one) minute, a voice transmission should be heard which contains the present position
displayed on the KLN94 Nav 2 page. Switch the toggle switch to AUTO and push the reset button
until it stops flashing.

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B KLN 94

2.4.4.6 Moving Map Interface

If the KLN 94 is interfaced to a moving map display, verify operation by moving the aircraft out to
an open location to acquire a satellite position. Enter an active flightplan or active waypoint to
develop a presentation on the map.
Some moving maps require 2 kts of ground speed to display, as the sense track angle is used
instead of the heading. The KLN 94 does not output track angles when the groundspeed is below
2 kts.

2.4.4.7 External Annunciators

Recycle the power on the KLN 94 which will cause the Self Test Page to be displayed. Verify that
all external annunciators are energized. Cycle the KLN 94 display past all initialization pages.
Verify all external annunciators are extinguished. If the message light comes on, view the
Message Page to verify that there is a message. If any other annunciator remains lighted, review
the status of the KLN94 to determine if the lighted annunciator is justified.

NOTE

Annunciators should be checked one at a time in order to verify that the correct
one lights.

2.4.4.8 Quicktune Interface

If the KLN 94 is interfaced to a KX 155A / KX 165A for Quicktune operation, the following test
must be performed to verify the installation. Turn on the KLN 94 and display the APT5 page,
where airport frequencies are displayed. choose any airport with at least one frequency. Press
the CRSR button, move the cursor on any frequency and press the ENT button. Verify that the
selected frequency now appears in the COMM Standby Frequency of the KX155A / KX165A. To
verify the NAV part of the operation, display the VOR1 page. Press the CRSR button, move the
cursor on the VOR frequency and press the ENT button. Verify that the selected frequency now
appears in the NAV Standby Frequency of the KX 155A / KX 165A.

2.4.4.9 Dataloader

The database cartridge may be updated with a new navigation database using a laptop
computer. The laptop computer must be IBM compatible and have an available COM port (1, 2, 3,
or 4).

Internet Update

A new navigation database can be obtained via the Internet at the following address:
http://www.gpsdatabase.com

Store the new database on the hard drive of the PC. Then connect the laptop via the PC loader
kit PN 050-03612-0000 (refer to Figure 2-26). Turn on the KLN 94 to the SET 3 page. Then run
the program NETLOAD.EXE and follow the appropriate instructions.

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B KLN 94

Diskette Update

Connect the laptop via the PC loader kit PN 050-03612-0000 (ref figure 2-26). Turn on the KLN
94 to the SET 3 page. Insert the 3.5" Database diskette into the PC. Cycle the power of the PC
and follow the menu driven instructions. (A small number of PC’s may exhibit problems during the
load because a few select BIOS services are incompatible with the Honeywell diskettes. If there
is uncertainty relating to this, contact Honeywell Product Services at [phone], or
Navigation Services at 1-800-247-0230 or [phone].)

NOTE

The KLN 94 database may be updated using a PC with the KLN 94 mounted
in an aircraft (refer to Figure 2-18).

Cartography databases are only updateable via card exchange. Update frequency has not yet
been established but will most likely be annually.

2.4.4.10 ALT ALERT

Upon approval of the self-test page, five (5) beeps will be issued on the audio output and five (5)
sonalert bursts will be produced by the ALT ALERT
“Enable”.

2.4.4.11 Heading Interface

Heading information may be interfaced to the KLN 94 by RS 232 to aid in the calculation of wind
vectors and for heading orientation of the NAV 4 or moving map. RS 232 heading information
may be provided from an analog to RS 232 converter, such as the Shadin fuel/air data device,
through the RS 232 input.

Display the NAV 4 page and select the HDG orientation to test the heading function. If a valid
heading source is available, HDG orientation will be selectable. Turn the cursor on the Nav 4
page to display the heading value when the HDG orientation is selected.

2.4.4.12 Flight Control Roll Steering Ground Test

, ALT ALERT AUDIO

output, if ALT ALERT has been configured

NOTE

This ground test assumes that a KFC 225 Flight Control System is installed.

Ground Test is not available for other Flight Control Systems

Ensure That:

All Gyros used by the Flight Control System need to be spun up to speed and the aircraft needs
to be level in the roll axis.

The Attitude Gyro is fully erected and stabilized.

The Flight Control System has conducted and completed a successful pre-flight test.

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The GPS is the selected sensor on the primary NAV indicator. The primary NAV indicator shows
the signals that the autopilot uses.

Turn the KLN 94 on to initiate its self-test sequence. While the KLN 94 performs its display test,
be ready to engage NAV mode on the autopilot, but do not engage the NAV mode yet.

When the NAV flag on the CDI/HSI moves out of view, immediately press the NAV button on the
KFC 225 computer to engage NAV coupled mode. If unsuccessful, the autopilot will only NAV
ARM and not show NAV coupled. If this happens, the KLN 94 must be turned OFF, then turned
ON again before the next attempt is made to engage the NAV coupled mode.

When the autopilot is in NAV coupled mode, then:

Turn OFF the KLN 94 cursor by pushing the CRSR button.

Push the KLN 94 PROC button.

Push the KLN 94 OBS button.

Push the KLN 94 PROC button.

Push the KLN 94 OBS button.

The KLN 94 should be outputting a signal equivalent to a 10 degree right bank. This should be
evident by the command bars indicating an approximate 10 degree right bank.

Push the KLN 94 CRSR button. The command bars should return to the wings-level state.

2.4.4.13 Aircraft Logbook Entry

Select the AUX 14 page and verify that the first line of that page on the unit display screen reads:

SW REVISION 0X0X

(where 0X0X is the last four digits of the KLN 94 Application Software 206- number)

An entry must be made in the aircraft log book upon installation of the KLN 94, indicating the
applicable software revision level. The recommended log book wording is as follows:

KLN-94 Application Software is at SW REVISION 0X0X on DD MMM YYYY.

(where XXXX represents the last four digits of the KLN 94 Application Software 206- number and
DD MMM YYY represents the Day, Month and Year of the installation)

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B KLN 94

2.5 ERROR CODES

The KLN 94 provides numeric error codes and text messages for certain failures. The following
table may assist in identifying the root cause of these problems.

GPS Rec.

Error Codes

RCVR Hardware
Error: XXXX:

RCVR Hardware
Error: 0002

RCVR Hardware
Error: 0004

RCVR Hardware
Error: 0008

RCVR Hardware
Error: 0010

Definition Suggested Action

This message appears when the
KLN 94 fails a specific internal test
for the GPS receiver. The possible
error codes are described below:

ROM Failure: The ROM memory
has failed self-test.

RAM Failure: The RAM memory
has failed self-test.

Nonvolatile Memory Failure: The
battery-backed RAM has failed a
checksum test. Non-volatile
memory will be cleared.

RF Failure: This means the
receiver is not sensing a proper RF
signal from the satellites/antenna.

Bad ROM. Return for service.

Bad RAM. Return for service.

It could be one of the following, in the order of
probability:

1. The battery-backup power to the GPS Receiver
was lost. This could be due to either a dead internal
battery or a bad connection on the cable to the
receiver.

2. The RAM memory is bad.

It could be one of the following, in the order of
probability:

1. Coax open or shorted. Confirm the 5 volts at the
antenna end.

2. Bad antenna. Substitute the antenna or inject a
signal at the coax.

3. Bad Receiver Module in GPS. Substitute the
GPS unit or inject signal at the input.

RCVR Hardware
Error: 0080

ASIC Failure: The GPS Correlator
ASIC fails self-test.

It could be one of the following, in the order of
probability:

1. The flex cable between the Receiver and Main
Board may have come out of the socket in the GPS.

2. Bad ASIC on receiver module in GPS. Substitute
the GPS unit.

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B KLN 94

GPS Rec.

Error Codes

RCVR Hardware
Error: 0100

RCVR Hardware
Error: 0400

RCVR Hardware
Error: 0800

Definition Suggested Action

BBP Timeout: The 1 mS baseband
processing timer has failed
self-test.

RS 232 Receiver Failure: The GPS
Receiver did not receive any
initialization data from the host
computer on the RS 232 port.

EEPROM Failure: The EEPROM
memory has failed its checksum.

It could be one of the following, in the order of
probability:

1. The 5 volt supply to the antenna could be
shorted out in the coax. This disables the oscillator
in the GPS.

2. The flex cable between the Receiver and Main
Board may have come out of the socket in the GPS.

3. Bad TCXO or ASIC on receiver module in GPS.
Substitute the GPS unit.

It could be one of the following, in the order of
probability:

1. The flex cable between the Receiver and Main
Board may have come out of the socket in the GPS.

2. Bad 32KHz crystal, UART, or processor on
Receiver Module in GPS. Substitute the GPS unit.

Bad EEPROM. Return for service.

RCVR Hardware
Error: 1000

RCVR Hardware
Error: 2000

RCVR Hardware
Error: 8000

RS 232 Channel 2 Failure: The
second RS 232 UART on the
receiver has failed the loop-back
test. This self-test can only be
enabled during test mode on the
receiver and should not be seen in
normal operation.

BBP Underflow: The baseband
processing loop detected an error
in the 1mS processing loop.

BBP Overflow: The baseband
processing loop detected an error
in the 1mS processing loop.

It could be one of the following, in the order of
probability:

1. The receiver was put in test mode without
looping back the two serial ports.

2. Bad ASIC or Microprocessor on the receiver.

It could be one of the following, in the order of
probability:

1. The flex cable between the Receiver Board and
the Main Board mat have come out of the socket in
the GPS.

2. Bad TCXO, MMIC, or ASIC on the Receiver
Board.

It could be one of the following, in the order of
probability

1. The flex cable between the Receiver Board and
the Main Board mat have come out of the socket in
the GPS.

2. Bad TCXO, MMIC, or ASIC on the Receiver
Board.

TABLE 2-1 GPS RECEIVER ERROR CODES

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B KLN 94

GPS Page
Messages

Altitude Fail Indicates a missing or erroneous

altitude.

The altitude input on the gray code
input from the encoder is wrong.

The GPS is configured for IFR and
there is no altitude source
available.

NAV Superflag Failure Indicates an internal test of the

NAV Superflag output has failed.

RAIM position error

Cross check position

RAIM is a method of calculating
integrity of the GPS position. It
calculates the position multiple
times using different sets of
satellites and compares the
answers. If they have excessive
differences, the message appears.

Definition Suggested Action

The altitude from the encoder may be in error due
to a miswire, or the absence of isolation diodes
between the encoder and the transponder.

If the GPS is configured for IFR, it must have a valid
altitude. Verify the presence of altitude on the
Self-Test or Altitude Pages (press the ALT button).

When the flag is supposed to be valid, it should
reach a minimum voltage. Usually a failure is due to
overloading of the output. The output can be tested
when the Self-Test Page is displayed.

It could be one of the following, in the order of
probability:

1. This probably is a GPS failure. Cross check your
position by other means of navigation. Return for
service.

2. The GPS has detected a problem with one of the
satellites and cannot be assured to be within IFR
limits.

No RS 232 Data There is no RS 232 data at the RS

232 input port.

RAIM not available

Cross check position

This means there are not enough
satellites available to compute
integrity (RAIM).

1. The satellites are blocked from
view by obstructions.

2. The satellites are too low on the
horizon for use or too high for
adequate geometry.

3. There is a loss of sensitivity in
the antenna, the coax or receiver
module.

The Air Data/Fuel Flow source is not outputting RS
232 data to the GPS. If no source of RS 232 is
interfaced, the receiver input must be jumpered
back to the RS 232 output.

The aircraft should be in an open area with good
visibility and the SNR (Signal to Noise Ratio) on the
AUX 2 page should be:

A KLN 94 will usually have 6-8 satellites shown and
the majority of their SNR values will be 7 to 9. SNR
values of 3 and below are unusable, 4 is marginal
and 5-9 are considered good. If the SNR values are
low, it could be one of the following, in order of
probability:

1. Check the antenna coax and connection for
problems.

2. Verify that 5 volts is present at the antenna end
of the coax.

3. Substitute the receiver to check for sensitivity.

4. Substitute the antenna to check for sensitivity.

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B KLN 94

GPS Page
Messages

RAIM not available

Cross check position

RAIM not available

Approach mode
inhibited

Predict RAIM on AUX
3

Definition Suggested Action

This means there are not enough
satellites available to compute
integrity (RAIM).

1. The satellites are blocked from
view by obstructions.

2. The satellites are too low on the
horizon for use or too high for
adequate geometry.

3. There is a loss of sensitivity in
the antenna, the coax or receiver
module.

This is a calculated prediction of
RAIM availability. The message
appears when integrity monitoring
(RAIM) is predicted to not be
available at either the FAF or MAP.

The GPS will not allow the unit to
go into APR ACTV mode until
conditions improve.

The aircraft should be in an open area with good
visibility and the SNR (Signal to Noise Ratio) on the
AUX 2 page should be:

A KLN 94 will usually have 6-8 satellites shown and
the majority of their SNR values will be 7 to 9. SNR
values of 3 and below are unusable, 4 is marginal
and 5-9 are considered good.

If the SNR values are low, it could be one of the
following, in order of probability:

1. Check the antenna coax and connection for
problems.

2. Verify that 5 volts is present at the antenna end
of the coax.

3. Substitute the receiver to check for sensitivity.

4. Substitute the antenna to check for sensitivity.

This is a feature, not a system failure.

Turn to the AUX 3 page to perform a RAIM
prediction. It will give you an indication of how long
it will be until RAIM is available.

This prediction can also be performed prior to
departure to insure RAIM at your arrival.

TABLE 2-2 GPS PAGE MESSAGES

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B KLN 94

GPS System

Error Codes

KLN 94
System Error
Code XXXX

001 Initialization Failure

003 Failed Powerup Self-Test

006 Exception Interrupt Detected. The

017 Run Time Database Checksum

025 ADC reference failed. The

101 Unit Not Responding

102 Bad Application Program

Definition Suggested Action

System Error Codes reflect an
error detected deep in the system.
Some of the numeric codes will be
described below:

processor received an undesirable
interrupt request.

Failed. An error was detected on
the internal NAV database chip.

reference voltage to the Analog to
Digital Converter is not at a proper
level.

Most of the System Errors require the attention of a
service center. Please note as many details as
possible when the failure occurred and identify if it
is repeatable.

Cycle the power and see if the error is repeatable. If
repeatable, take the unit to a Service Center.

Bad internal NAV database chip. Return for service.

103 Invalid or Missing Database Card

TABLE 2-3 GPS SYSTEM ERROR CODES

NOTE

If any error code appears other than the ones listed above, contact Honeywell
Product Support at [phone].

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B KLN 94

SECTION III

OPERATION

3.1 GENERAL INFORMATION

For an explanation of the operating controls of the KLN 94 GPS RNAV refer to the KLN 94 Pilot’s
Guide (P/N 006-18207-0000) or the aircraft’s flight manual supplement.

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B KLN 94

THIS PAGE IS RESERVED.

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B KLN 94

APPENDIX A

RS-232 FORMAT DEFINITIONS

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B KLN 94

1.0 GENERAL RS-232 IN

The RS-232 interface will have the following characteristics:

BYTE FORMAT

Electrical per EIA RS 232C

9600 baud, 8 bits, 1 stop bit, no parity

MARK is a logical 1 (one) and SPACE is a logical 0 (zero)

START bit begins as MARK, goes to SPACE

The receiving order of data bits within each data byte shall be:

START bit

Data bit 0 (LSB)

Data bit 1

Data bit 2

Data bit 3

Data bit 4

Data bit 5

Data bit 6

Data bit 7 (MSB)

STOP bit

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B KLN 94

Fuel/air data input protocol

Fuel/air data sent by the Airdata computer shall be received in a block having one of the following
formats:

FORMAT A (13 BYTE ASCII STRING)

BYTE DESCRIPTION / FORMAT

1 STX (ASCII code 02H)

2 Unit of Measure

G = .1 gallon
I = .1 imperial gallon
L = 1 liter
K = 1 kilogram
B = 1 pound

3-6 Fuel Remaining

ASCII-coded decimal format, LSB first

Example:
A fuel remaining value of 432 would be sent as “2340” (32H, 33H, 34H, 30H).

7 Fuel Remaining Checksum:

Break each decimal value into BCD representation. Using BCD arithmetic, sum the 4
BCD values and convert the lower-order BCD digit to an ASCII coded numeric digit.

Example:
The checksum for a value of 432 would be “9” (39H).

8-11 Fuel Flow Rate (units / hours)

ASCII-coded decimal format as used for Fuel Remaining.

12 Fuel Flow Rate Checksum

Sum of fuel flow rate bytes computed as described for Fuel Remaining checksum.

13 EXT (ASCII code 03H)

NOTE:

1. Fuel remaining and fuel flow rate information shall be for the complete aircraft.

2. This 13 byte record shall be transmitted every 1.6 seconds ± 0.16 seconds.

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B KLN 94

FORMAT B (52 BYTE ASCII STRING)

BYTE DESCRIPTION

1 STX (ASCII code 02H)

2 Unit of Measure

G = .1 gallon
I = .1 imperial gallon
L = 1 liter
K = 1 kilogram
B = 1 pound

3-8 Total Fuel Remaining

ASCII-coded decimal format (least significant digit is tenths), LSB first

Example:
A fuel remaining value of 543.2 would be sent as “2.3450” (32H, 2EH, 33H, 34H, 35H,
30H).

9 Total Fuel Remaining Checksum

Break each decimal value into BCD representation. Using BCD arithmetic, sum the 4
BCD values and convert the lower-order BCD digit to an ASCII coded numeric digit.

Example:
The checksum for a value of 543.2 would be “4” (34H).

10-15 Total Fuel Flow Rate

ASCII-coded decimal format as for Total Fuel Remaining.

16 Total Fuel Flow Rate Checksum

Sum of fuel flow bytes computed as for Total Fuel Remaining.

17-22 Engine One Fuel Flow Rate

ASCII-coded decimal format as for Total Fuel Remaining

23 Engine One Fuel Flow Rate Checksum

Sum of Left Engine Fuel Flow Rate bytes computed as for Total Fuel Remaining

24-29 Engine Two Fuel Flow Rate

ASCII-coded decimal format as for Total Fuel Remaining.

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B KLN 94

FORMAT B (52 BYTE ASCII STRING) - con’t

BYTE DESCRIPTION

30 Engine Two Fuel Flow Rate Checksum

Sum of Right Engine Fuel Flow Rate bytes computed as for Total Fuel Remaining

31-36 Total Fuel Used

ASCII-coded decimal format as for Total Fuel Remaining

37 Total Fuel Used Checksum

Sum of Total Fuel Used bytes computed as for Total Fuel Remaining

38-43 Engine One Fuel Used

ASCII-coded decimal format as for Total Fuel Remaining

44 Engine One Fuel Used Checksum

Sum of Left Engine Fuel Flow Rate bytes computed as for Total Fuel Remaining

45-50 Engine Two Fuel Used

ASCII-coded decimal format as used for Total Fuel Remaining

51 Engine Two Fuel Used Checksum

Sum of Left Engine Fuel Flow Rate bytes computed as for Total Fuel Remaining

52 ETX (ASCII code 03H)

NOTE:

1. In the case of single engine aircraft, all Engine One and Engine Two data (including
checksums) shall be asterisks (ASCII code 2AH).

2. This 52 byte record shall be transmitted every 1.6 seconds ± 0.16 seconds.

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B KLN 94

FORMAT C (108 BYTE ASCII STRING)

BYTE DESCRIPTION / FORMAT

1-51 Same as Format B described above except that in the Units of Measure field, “I =

Imperial Gallons” is undefined.

52-54 Indicated Airspeed (IAS, knots)

ASCII-coded decimal format (least significant digit is units), LSB first.

Example:
An IAS of 298 knots would be sent as “892” (38H, 39H, 32H).

55 Indicated Airspeed Checksum

Break each decimal value into BCD representation. Using BCD arithmetic, sum the 3
BCD values and convert the lower-order BCD digit to an ASCII coded numeric digit.

56-58 True Airspeed (TAS, knots)

ASCII-coded decimal format as for IAS

59 True Airspeed Checksum

Sum for TAS bytes computed for IAS.

60-62 MACH (airspeed/speed of sound)

ASCII-coded decimal format with an implicit leading decimal point (least significant
digit is thousands).

Example:
A MACH value of .492 would be sent as “294” (32H, 39H, 34H).

63 MACH Checksum

Sum for MACH bytes computed as for IAS.

64-69 Pressure Altitude (PALT, feet)

ASCII-coded decimal format with a sign character.

Example:
A PALT of 34500 feet would be sent as “00543+” (30H, 30H, 35H, 34H, 33H, 2BH).

70 Pressure Altitude Checksum

Sum for PALT bytes, excluding the sign character.

Example:
The sum for -850 feet would be “3” (33H).

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B KLN 94

FORMAT C (108 BYTE ASCII STRING) - con’t

BYTE DESCRIPTION / FORMAT

71-76 Density Altitude (DALT, feet)

ASCII-coded decimal format with a sign character, as for PALT.

77 Density Altitude Checksum

Sum for DALT bytes, excluding the sign character, as for PALT.

78-80 Total Air Temperature (×C)

ASCII-coded decimal format with a sign character

Example:
An OAT of 25×C would be sent as “52+”.

81 Total Air Temperature Checksum

Sum for total air temperature bytes, excluding the sign byte, as for PALT.

82-84 Wind Direction (degrees from true North)

ASCII-coded decimal format

Example:
122 degrees would be sent as “22” (32H, 32H, 31H).

85 Wind Direction Checksum

Sum for wind direction bytes, as for IAS

86-88 Wind Speed (knots)

ASCII-coded decimal format, as for IAS

89 Wind Speed Checksum

Sum for wind speed bytes, as for IAS

90-92 Drift (degrees)

ASCII-coded decimal format with a direction character

Example:
7 right would be sent as “70R”, 14 left would be sent as “41L”.

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B KLN 94

FORMAT C (108 BYTE ASCII STRING) - con’t

BYTE DESCRIPTION / FORMAT

93 Drift Checksum

Sum for drift bytes, excluding the direction character

Example:
The sum for “41L” would be “5” (35H).

94-98 Rate of change of PALT (feet/minute)

ASCII -coded decimal format with a sign character

Example:
A PALT rate of change of -210 ft/min (descent), would be “012-” (30H, 31H, 32H, 30H,
2DH).

99 Rate of change of PALT checksum

Sum for PALT rate of change bytes, excluding the sign character, as for PALT.

100-

102

103 Magnetic Heading Checksum

104-

106

107 Static Air Temperature Checksum

108 ETX (ASCII code 03H)

Magnetic Heading (degrees from magnetic North)

ASCII-coded decimal format, as for wind direction

Sum for magnetic heading bytes, as for IAS

Static Air Temperature (×C)

ASCII-coded decimal format with a sign character

Example:
A static air temperature of -2×C would be sent as “20-”.

Sum for static air temperature bytes, excluding the sign character, as for PALT.

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B KLN 94

FORMAT D (121 BYTE ASCII STRING)

BYTE DESCRIPTION / FORMAT

1-

107

108-

112

113 Barometric Setting Checksum

114-

119

Same as Format C described above except that bytes 3 through 9 shall be filled with
asterisks if total fuel remaining is not available and consequently must be entered
through the KLN 94.

Barometric Setting (inches HG)

ASCII-coded decimal format (least significant digit is hundredth of inches), LSB first.

Example:
A barometric setting of 29.83 inches HG would be sent as “38.92” (33H, 38H, 2EH,
39H, 32H).

Break each decimal value into BCD representation. Using BCD arithmetic, sum the 4
BCD values and convert the lower-order BCD digit to an ASCII-coded numeric digit.

Example:
The checksum for a value of 29.83 would be “2” (32H).

Baro-corrected Altitude (feet)

ASCII-coded decimal format with a sign character

Example:
A baro-corrected altitude of +11000 feet would be sent as “00011+” (30H, 30H, 30H,
31H, 31H, 2BH).

120 Baro-corrected Altitude Checksum

Sum for baro-corrected altitude bytes computed, excluding sign character, as for
pressure altitude.

121 EXT (ASCII code 03H)

FUEL FLOW & AIR DATA CONFIGURATION

The fuel flow and air data equipment configuration can be setup on MNT 1 page.

1. Fuel flow equipment installed and Air data equipment not installed:

Any the above formats may be received. If format C or D is received, the airdata portions are
ignored, the fuel data portions are used, and no error message is given.

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B KLN 94

2. Fuel flow equipment not installed and Air data equipment installed:

If format C or D is received, fuel data portions are ignored, the airdata portions are used and
no error message is given. If format A or B is received, the “GEN RS-232 In Data Error”
message is displayed.

3. Both fuel flow equipment and air data equipment not installed:

If no data is received for this setup, the “No GEN RS-232 In Data” message will be displayed.

Fuel/Air Data Timing Requirement

A grace period of 2.4 seconds, in addition to the 1.6 second transmission interval, shall be given
to every fuel/air data transmission. The unit invalidates all local copies if fuel/air data is not
received for 4.0 seconds ± .40 seconds.

2.0 GENERAL RS232 OUT

Functional Description

BYTE FORMAT

Electrical per EIA RS 232C

9600 baud, 8 bits, 1 stop bit, no parity

MARK is a logical 1 (one) and SPACE is a logical 0 (zero)

START bit begins as MARK, goes to SPACE

The order of transmission within each data byte shall be:

START bit

Data bit 0 (LSB)

Data bit 1

Data bit 2

Data bit 3

Data bit 4

Data bit 5

Data bit 6

Data bit 7 (MSB)

STOP bit

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