INSTALLATION MANUAL
KRA 405B
RADAR ALTIMETER
MANUAL NUMBER 006-10536-0010
REVISION 10 OCTOBER, 2005
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
REVISION HIGHLIGHTS
006-10536-0010 Rev. 10
Oct/2005
This is a full reprint of the KRA 405B Installation Manual. Discard the previous
manual revision in its entirety. Specific changes to content are denoted by
change bars.
Revision highlight(s) include the updating the environmental qualification forms
to revision AF.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
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ITEM
C. RADAR ALTIMETER ANTENNAS (2 each).........................................1-10
1.5 ACCESSORIES REQUIRED BUT NOT SUPPLIED.....................................1-11
1.6 OPTIONAL ACCESSORIES RECOMMENDED BUT NOT SUPPLIED.........................1-12
A. CM 2000 CONFIGURATION MODULE KIT P/N 050-03380-0000.......................1-12
B. KPA 900 CONFIGURATION MODULE PROGRAMMER KIT...............................1-13
1.7 LICENSE REQUIREMENTS......................................................1-14
1.8 INSTRUCTIONS FOR CONTINUED AIRWORTHINESS..................................1-14
SECTION II
INSTALLATION
2.1 GENERAL INFORMATION........................................................2-1
2.2 UNPACKING AND INSPECTING EQUIPMENT.........................................2-1
2.3 EQUIPMENT INSTALLATION.....................................................2-1
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ITEM
2.6 POST INSTALLATION.........................................................2-15
A. KRA 405B RECEIVER/TRANSMITTER.............................................2-22
B. KNI 415/416 INDICATOR.....................................................2-23
C. ANTENNAS..................................................................2-24
2.8 HONEYWELL MAINTENANCE RECOMMENDATIONS.....................................2-24
SECTION III
OPERATION
3.1 GENERAL....................................................................3-1
3.2 NORMAL OPERATION...........................................................3-2
A. PREFLIGHT..................................................................3-2
B. TAXI.......................................................................3-2
C. IN FLIGHT OPERATION........................................................3-3
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
ITEM
PAGE
D. APPROACH...................................................................3-3
E. PUSH-TO-TEST MODE..........................................................3-3
3.3 SELF-TEST DIAGNOSTICS......................................................3-4
TSO APPENDIX
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
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ITEM
FIGURE 2-1
FIGURE 2-2
FIGURE 2-3
FIGURE 2-4
FIGURE 2-5
FIGURE 2-6
FIGURE 2-7
FIGURE 2-8
FIGURE 2-9
FIGURE 2-10
FIGURE 2-11
FIGURE 2-12
FIGURE 2-13
FIGURE 2-14
FIGURE 2-15
FIGURE 2-16
FIGURE 2-17
FIGURE 2-18
FIGURE 3-1
FIGURE 3-2
KRA 405B POST INSTALLATION CALIBRATION SWITCH...................2-16
KNI 415/416 INSTALLATION DRAWING................................2-25
KRA 405B INSTALLATION DRAWING...................................2-27
DUAL RADAR ALTIMETER SYSTEM TYPICAL ANTENNA INSTALLATIONS.......2-29
KA 54 ANTENNA OUTLINE AND MOUNTING DRAWING......................2-33
UBC TYPE AD 43013-1 AND COMANT TYPE 01-34-04531.................2-35
DORNE MARGOLIN TYPE DMPN 3-4/A ANTENNA..........................2-37
KA 54A ANTENNA..................................................2-39
HONEYWELL GT 7003586 (SENSOR SYSTEMS TYPE S67-2002-4 ANTENNA)...2-41
TNC COAX/CONNECTOR ASSEMBLY (RG 393/U)..........................2-43
CONNECTOR PIN LOCATIONS.........................................2-44
KRA 405B TEST EQUIPMENT SETUP...................................2-45
EXTERNAL SONALERT...............................................2-46
KRA 405B RADAR ALTIMETER SYSTEM INTERCONNECT....................2-47
CM 2000 CONFIGURATION MODULE MOUNTING DRAWING...................2-49
KNI 415 CONTROL FUNCTIONS........................................3-5
KNI 416 CONTROL FUNCTIONS........................................3-6
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
ITEM
PAGE
TABLE 1-1
TABLE 1-2
TABLE 2-1
KNI 415/416 INDICATOR AVAILABILITY..............................1-10
CABLE INSTALLATIONS.............................................1-11
TSO CERTIFIED ANTENNAS...........................................2-9
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
SECTION I
GENERAL INFORMATION
1.0 INTRODUCTION
This manual contains information relative to the physical, mechanical, and
electrical characteristics of the BENDIX/KING KRA 405B. Installation and
operating procedures are also included. Information relative to the
maintenance and procurement of replacement parts may be found in the KRA
405B Maintenance Manual Part Number 006-15536-00XX (XX = Highest
Revision).
NOTE:
The KRA 405B System consists of four modules: the Radar Altim-
eter (Receiver/Transmitter), the Radar Altimeter Indicator, the
Radar Altimeter Antennas (2 each), and the CM 2000 Configuration
Module (optional). The system is positioned as a replacement
for the KRA 405 Radar Altimeter System.
The preferred configurations utilize the following components:
COMPONENT
UNIT
PART NUMBER
CHARACTERISTIC
STANDARD
RADAR ALTIMETER
KRA 405B
KRA 405B
KRA 405B
066-01153-0101
066-01153-0202
066-01153-2001/-4001
ARINC 552A
ENHANCED DIGITAL AC-
CURACY
CONTROLLER/DISPLAY
KNI 415
KNI 415
KNI 415
KNI 415
KNI 415
066-3031-00
066-3031-01
066-3031-02
066-3031-03
066-3031-04
5 VOLT BLK
28 VOLT BLK
5 VOLT GRY
28 VOLT GRY
28 VOLT BLK NIGHT VI-
SION
KNI 416
KNI 416
KNI 416
KNI 416
KNI 416
066-3044-00
066-3044-01
066-3044-02
066-3044-03
066-3044-04
5 VOLT BLK
28 VOLT BLK
5 VOLT GRY
28 VOLT GRY
28 VOLT BLK NIGHT VI-
SION
ANTENNA
KA 54A
KA 54A
CM 2000
071-1501-00
WHITE (2 EACH)
BLACK (2 EACH)
OPTIONAL
ANTENNA (OPTIONAL)
CONFIGURATION MODULE
071-01501-0100
071-00097-0100
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
Some part numbers may not be currently available. Consult the current
Honeywell catalog or contact a Honeywell representative for equipment
availability. The KRA 405B System also may consist of previously TSO
certified components from the following list. However the use of any
configurations other than the preferred configuration will result in
reduced functionality of the system.
MODEL
KA 54
DESCRIPTION
RETROFIT ANTENNA
certification will be the sole responsibility of the customer and/or the
installing agent. Please contact a field representative for additional
information.
1.1 DESCRIPTION OF EQUIPMENT
The KRA 405B Radar Altimeter System provides the pilot with dependable,
accurate AGL (altitude above ground level) information during the approach
phase of a flight. The system has the capability of alerting the pilot
when a predetermined altitude (decision height) is reached. The system
also provides altitude information to the flight control system during the
approach.
The KRA 405B Radar Altimeter (P/N 066-01153-0202), in addition to
providing an ARINC 552A output for Auxiliary Out 2, has the ability to
take a DH input from an EFIS or KNI 415/416 and generate an audio signal
(refer to section 1.3. C. KRA 405B RECEIVER/TRANSMITTER for tone generator
circuit specifications).
The KRA 405B Radar Altimeter (P/N 066-01153-2001/-4001) provides enhanced
accuracy ( 2 feet) below 100 feet using the digital 429 Buss labels 164
and 165.
Both KRA 405B versions P/N 066-01153-0101 and P/N 066-01153-0202 with
software 01/04, 02/04 or higher will not report negative values of
altitude on the ARINC 429 digital bus unless expressly configured to do
so. This feature is required for installations with Honeywell EFIS 40/
50. One of these two unit versions (-0101 or -0202) must be used when
interfacing the digital output of the KRA 405B to equipment which expect
non-negative values.
The KRA 405B determines the altitude above ground level (AGL) by
transmitting a signal to the ground then processing the reflected signal.
The altimeter outputs the altitude information as analog voltages and in
ARINC 429 digital format.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
The KRA 405B Radar Altimeter System consists of the KRA 405B Receiver/
Transmitter, the KNI 415 or KNI 416 Indicator, and two (2) KA 54A Antennas.
The entire system is solid state except for a servo mechanism and relay
in the Indicator.
The KRA 405B Radar Altimeter replaces the KRA 405 altimeter. The KRA 405B
is electrically compatible with the same indicators and antennas as the
KRA 405.
NOTE:
The connectors for KRA 405 and KRA 405B are not compatible.
1.2 ACRONYMS AND ABBREVIATIONS
ACRONYM
AGL
MEANING
Above Ground Level
ARINC
EUROCAE
FAA
Aeronautical Radio Incorporated
The European Organization for Civil Aviation Electronics
Federal Aviation Administration
Federal Communications Commission
Fernmeldetechischeszentralamt (German)
Hertz
FCC
FTZ
Hz
IF
Intermediate Frequency
kilohertz
kHz
GHz
Gigahertz
MHz
Megahertz
PEO
Precision Equipment Output
Part Number
P/N
RTCA
R/T
Requirements and Technical Concepts for Aviation
Receiver/Transmitter
TSO
Technical Standing Order
Voltage Standing Wave Ratio
VSWR
XX
Part numbers ending in XX denotes the highest revision available (Example: 006-
10536-00XX)
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
1.3 TECHNICAL CHARACTERISTICS
A. KRA 405B RADAR ALTIMETER SYSTEM
SYSTEM ALTITUDE ACCURACY:
5 ft (1.5 m) or 5% (whichever is greater)
at 0 to 500 feet and 7% at 500 to 2,500 feet
SYSTEM ANTENNA CABLES (2 Required):
Length:
See 1.5 ACCESSORIES REQUIRED BUT NOT SUPPLIED
27.5 Vdc 20% at 2 Amperes maximum
5.1 lbs (2.31 kg)
Cable Type:
SYSTEM POWER REQUIREMENTS:
SYSTEM WEIGHT (less cables):
B. KRA 405B RECEIVER/TRANSMITTER TSO
TSO COMPLIANCE:
C87/ETSO-2C87 (See TSO APPENDIX)
55,000 ft (16,764 m)
-55° C to +70° C
ALTITUDE:
OPERATIONAL TEMPERATURE RANGE:
NON TSO’D FUNCTIONS
NONE
C. KRA 405B RECEIVER/TRANSMITTER
PHYSICAL CHARACTERISTICS:
Length:
Width:
See FIGURE 2-6 KRA 405B INSTALLATION DRAWING
See FIGURE 2-6 KRA 405B INSTALLATION DRAWING
Height:
WEIGHT: KRA 405B
With Mtg rack (optional)
POWER REQUIREMENTS:
Nominal Current
Maximum Current
27.5 Vdc 20% at 850 mA
18 Vdc @ 1.2 Amperes (emergency)
ALTITUDE RANGE:
Tracked:
-20 to 2,500 feet (-6.1 to 762.0 m)
0-2500 feet (0-762.00 m)
ALTITUDE TRIPS (selectable):
Adjustment Range #1, 2, and 3:
figuration Module
(Con-
Programmable)
Factory Settings:
Trip #1 200 feet (60.90 m)
Trip #2 500 feet (152.40 m)
Trip #3 1200 feet (365.76 m)
ALTITUDE ACCURACY:
066-01153-0101,-0202,-2001/-4001
3 ft (0.91 m) or 3% (whichever is greater)
(All Analog and Digital Altitude Outputs except at 0 to 500 feet and 5% at 500 to 2,500 feet
066-01153-2001/-4001 Digital Outputs)
ALTITUDE ACCURACY:
066-01153-2001/-4001
2 ft (0.61 m) below 100 feet,
3% at 100 feet to 500 feet, and
5% at 500 to 2,500 feet
ARINC 429 Outputs Labels 164 and 165
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
C. KRA 405B RECEIVER/TRANSMITTER (cont.)
ALTITUDE OUTPUT:
Slope:
Precision Equipment:
-20 to 2,500 ft (-6.1 to 762.0 m) -10 mV/ft (32.81 mV/m); Zero
ft = 0.000 volts
Auxiliary Out #1:
-20 to 500 feet (-6.1 to 152.4 m) +20 mV/ft (+65.62 mV/m); 500
to 2,500 feet (152.4 to 762 m) +3 mV/ft (9.84 mV/m); Zero ft
= +0.400 volts
Auxiliary Out #2:
(-0101, -2001/-4001)
-20 to 2,500 feet (-6.1 to 762.0 m) -4 mV/ft (13.12 mV/m);
Zero feet = 0.000 volts
Auxiliary Out #2:
(-0202)
-20 to 480 feet (-6.1 to 146.3 m) +20 mV/ft (+65.62 mV/m); 480
to 2,500 feet (146.3 to 762 m) 10 x logn [e(h+20)/500](10 x
logn [e(h+6.1/152.4)]m); Zero ft = +0.400 volts
Analog Altitude:
Arinc 429 Out:
-20 to 500 feet (-6.1 to 152.4 m) +20 mV/ft (+65.62 mV/m); 500
to 2,500 feet (152.4 to 762 m) +3 mV/ft (9.84 mV/m); Zero ft
= +0.400 volts
Shall meet all ARINC 429 electrical
specifications.
The following are serial digital outputs from the KRA 405B:
LABEL
164
INFORMATION CONTAINED IN LABEL
Radio Height
FORMAT
BNR
SPEED
Low Speed
Low Speed
Low Speed
Low Speed
165
Radio Height
BCD
371
GA Equipment Code
BCD
377
Equipment Identifier Word
BCD
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
C. KRA 405B RECEIVER/TRANSMITTER (cont.)
Load Capability:
Off Scale Voltage:
Precision Equipment Output:
Auxiliary Out #1:
Auxiliary Out #2:
Auxiliary Out #2:
Time Constant:
4 loads, @ 2 kΩ per load
-28.0 1.5 Vdc
+17.3 0.5 Vdc
-11.2 0.6 Vdc (-0101)
27.5 1.5 Vdc (-0202)
Precision Equipment Output:
TRANSMITTER OUTPUT:
Power:
0.1 second maximum
160 mW nominal, FMCW
4300 15 MHz
Center Frequency:
Modulation Frequency:
Primary:
100 Hz nominal
Secondary:
105 Hz nominal (in dual installation)
TRANSMITTER OUTPUT: (cont.)
FM Deviation P-P:
Type of Service:
WARNING SYSTEM:
100 MHz
Continuous
FCS Warn:
Normal Operation:
Warn Condition:
+18 to +32 Vdc at less than 250 mA
Less than 10 μA
Altimeter Valid:
Normal Operation:
Warn Condition:
+18 to +32 Vdc at less than 250 mA
Less than 10 μA
Rad_Alt Valid:
Normal Operation:
Warn Condition:
+18 to +32 Vdc at less than 250 mA
Less than 10 μA
ALTITUDE TRIPS:
Tripped (Locked R/T):
Untripped (Unlocked R/T):
TONE GENERATOR CIRCUIT:
DH Tone Enable Active Level:
Inactive Level:
+0.5 Vdc maximum at less than 250 mA
10 μA maximum at less than +30 Vdc
Low: < 3.5 Vdc
High: > 17 Vdc
Tone Active Time:
Output Frequency:
Output Level (-0202):
Noise Level:
2.5 seconds .5 seconds
587 HZ 20 Hz (music tone D)
30mW 10 mW into a 500 Ω load
60 dB min below rated level
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
D. KNI 415/416 INDICATOR
TSO COMPLIANCE:
C87/ETSO-2C87 DO-138
Env. Cat GAPAAAXXXXXX
PHYSICAL DIMENSIONS:
Length:
See FIGURE 2-5 KNI 415/416 INSTALLATION DRAWING
Width:
Height:
WEIGHT:
See FIGURE 2-5 KNI 415/416 INSTALLATION DRAWING
55,000 feet (16,764 m)
ALTITUDE:
OPERATIONAL TEMPERATURE RANGE:
POWER REQUIREMENTS:
Primary Power:
-20° C to +70° C
27.5 Vdc 20% @ 850 mA
Panel Lamp Power: (28 volt units)
Panel Lamp Power: (5 volt units)
ALTITUDE RANGE DISPLAYED:
ALTITUDE ACCURACY:
0 to 500 ft:
28 Vdc 10% or 26 Vac 10% @ 120 mA
+5 Vdc 10% or 5 Vac 10% @ 575 mA
-20 to 2,000 feet (-6.1 to 609.60 m)
4 feet (1.22 m) or 4% (whichever is great-
er)
500 to 2,000 ft:
DECISION HEIGHT:
5%
Altitude Range:
(pilot adjustable)
0 to 2,000 feet (0 to 609.60 m)
Accuracy:
5 feet (1.27 m) or 5%, whichever is greater
EXTERNAL DECISION HEIGHT OUTPUT:
Isolated pair of relay contacts for switching
external circuit. 110 mA at 28 Vdc, 3 watts
maximum continuous contact load.
VISUAL WARNING SYSTEM:
Pilot Display Warning Flag:
Normal Operation:
Flag Condition:
Flag hidden from view
Power failure or altitude error
Indicator Needle:
Over Altitude:
Needle hidden from view
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
E. KA 54A ANTENNA
TSO COMPLIANCE:
C87/ETSO-2C87 DO-160A
Env. Cat. D2AJXWFD
PHYSICAL CHARACTERISTICS:
Length:
See FIGURE 2-11 KA 54A ANTENNA
Width:
Height:
WEIGHT: (2 required)
ALTITUDE:
See FIGURE 2-11 KA 54A ANTENNA
60,000 ft (18,281 m)
OPERATIONAL TEMPERATURE RANGE:
BEAMWIDTH:
-54° C TO +85° C
E-Plane:
45° min.
H-Plane:
40° min.
SIDELOBES:
Greater than -40 dB down
4240 - 4360 MHz: 1.5:1 Maximum
10 dBi (above isotopic)
Linear
VSWR:
GAIN:
POLARIZATION:
POWER HANDLING:
CROSS COUPLING:
1 watt average, 10 watts peak
20 in spacing - 88 dB max
36 in spacing - 95 dB max
INPUT IMPEDANCE:
50 ohms nominal
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
F. KA 54 ANTENNA (RETROFIT ONLY)
TSO COMPLIANCE:
C87/ETSO-2C87 DO-138
Env. Cat. AAAAAX
PHYSICAL CHARACTERISTICS:
See FIGURE 2-8 KA 54 ANTENNA OUTLINE AND MOUNT-
ING DRAWING
Length:
Width:
Height:
WEIGHT: (2 required)
See FIGURE 2-8 KA 54 ANTENNA OUTLINE AND MOUNT-
ING DRAWING
ALTITUDE:
55,000 feet (16,764 m)
OPERATIONAL TEMPERATURE RANGE:
BEAMWIDTH:
-54° C to +71° C
E-Plane:
50° 5°
H-Plane:
40° 4°
SIDELOBES:
Greater than 25 dB down
4240 - 4360 MHz: 1.3:1 Maximum
11.5 dBi (above isotopic)
Linear
VSWR:
GAIN:
POLARIZATION:
POWER HANDLING:
CROSS COUPLING:
100 watts average, 1 kW peak
20 in spacing - 80 dB max
36 in spacing - 95 dB max
50 ohms nominal
INPUT IMPEDANCE:
1.4 UNITS AND ACCESSORIES SUPPLIED (KRA 405B SYSTEM COMPONENTS)
NOTE:
Some part numbers may not be currently available. Consult the
current Honeywell catalog or contact a Honeywell representative
for equipment availability.
A. RADAR ALTIMETER (Receiver/Transmitter)
Honeywell KRA 405B, P/N 066-01153-0101 (Standard)
Honeywell KRA 405B, P/N 066-01153-0202 (ARINC 552A compatible)
Honeywell KRA 405B, P/N 066-01153-2001/-4001 (Enhanced accuracy
below 100 feet).
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
B. RADAR ALTIMETER INDICATOR - Honeywell KNI 415 or KNI 416
UNIT
PART NUMBER
066-3031-00
066-3031-01
066-3031-02
066-3031-03
066-3031-04
066-3044-00
066-3044-01
066-3044-02
066-3044-03
066-3044-04
FACEPLATE
BLACK
BLACK
GRAY
PANEL LIGHTING
5 VOLT
KNI 415
KNI 415
KNI 415
KNI 415
KNI 415
KNI 416
KNI 416
KNI 416
KNI 416
KNI 416
28 VOLT
5 VOLT
GRAY
28 VOLT
BLACK
BLACK
BLACK
GRAY
NIGHT VISION
5 VOLT
28 VOLT
5 VOLT
GRAY
28 VOLT
BLACK
NIGHT VISION
TABLE 1-1 KNI 415/416 INDICATOR AVAILABILITY
C. RADAR ALTIMETER ANTENNAS (2 each)
Honeywell KA 54A, Part Number 071-1501-00 (White)
Part Number 071-01501-0100 (Black)
Gaskets are included with a new antenna. They may be ordered
separately as P/N 187-01753-0000.
NOTE:
The KA 54 Radar Altimeter Antenna is compatible with the
KRA 405B and may be used in retrofit situations. However,
this antenna is no longer available from the factory.
D. KRA 405B INSTALLATION KIT
P/N 050-03365-00XX which includes the following:
PART NUMBER
DESCRIPTION
UM -00 -01 -02 -03 VENDOR PART NUMBER
030-02077-0000
030-02077-0004
057-05944-0017
057-05944-0018
057-05944-0019
057-05944-0020
071-04003-0000
41 Pin Conn Solder
41 Pin Conn Crimp
TSO KIT LABEL
TSO KIT LABEL
TSO KIT LABEL
TSO KIT LABEL
Mounting Rack
EA 1
EA 0
EA 1
EA 0
EA 0
EA 0
EA 1
1
0
0
1
0
0
0
0
1
0
0
1
0
1
0
1
0
0
0
1
0
CANNON KPT06B2041S
CANNON KPSE06F20-41S
N.A.
N.A.
N.A.
N.A.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
E. KNI 415/416 INDICATOR INSTALLATION KIT
P/N 050-01401-0002 which includes the following:
PART NUMBER
DESCRIPTION
UM
EA
EA
EA
EA
EA
EA
-02
1
VENDOR PART NUMBER
030-02210-0012
057-02029-0008
057-02029-0009
073-00044-0001
073-00045-0000
073-00045-0001
089-05115-0012
089-06461-0012
Connector
ITT CANNON KPS306F14-19SY
Connector Label
Connector Label
Plate, Mooring
1
1
Plate, Adapter Blk
Plate, Adapter Gry
FHP 6-32x3/4, Blk Scr
1
1
4
F. KA 54A RADAR ALTIMETER ANTENNA INSTALLATION KIT
P/N 050-02960-0000 which includes the following:
PART NUMBER
DESCRIPTION
UM
EA
QTY
4
VENDOR PART NUMBER
TED 5-10-43
030-00108-0000
Conn RG 214-TNC
*See TABLE 1-2 CABLE INSTALLATIONS for alternate cable
installations.
1.5 ACCESSORIES REQUIRED BUT NOT SUPPLIED
A. RG 393 Cable (preferred cable) Part Number 024-00075-0000 (see
TABLE 1-2 CABLE INSTALLATIONS for minimum and maximum lengths).
B. For other cable installations, see TABLE 1-2 CABLE INSTALLATIONS.
Cable Type
Part Number
Attenuation/
100 feet(dB)
Min total
Install
Length (ft)
24.5
Max Total
Install
Length (ft)
45.3
Min Bend
Radius
(in)
5.8
RG 393
024-00075-0000
024-00002-0000
024-00072-0000
024-00071-0000
18.75
32.40
18.5
13.41
25.16
16
RG 142
25.2
26.2
2.9
ECS 311601
ECS 311201
29.0
45.9
3.5
28.6
63.4
4.8
PIC: S44193 024-00077-0001
PIC: S67163 N/A
24.7
48.6
1.0
28.4
66.4
1.2
PIC: S33141 N/A
14.5
28.4
58.6
1.4
TABLE 1-2 CABLE INSTALLATIONS
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
CONNECTOR, STRAIGHT TNC
CONNECTOR, RIGHT ANGLE TNC
Cable
Type
Cable
Honeywell
Part No.
Vendor
Honeywell
Part No.
Vendor
Part No.
Part No.
Part No.
RG 393
RG 142
024-00075-0000 030-00108-0004 TED: 5-10-43-2 N/A
024-00002-0000 030-00134-0000 TED: 5-10-30
TED: 5-30-14-1
030-00134-0001 TED: 5-30-102
ECS 311601 024-00072-0000 N/A
ECS 311201 024-00071-0000 N/A
ECS: CTS 922
ECS: CTS 122
N/A
N/A
ECS: CTR 922
ECS: CTR 122
Cable Type
CONNECTOR,
STRAIGHT TNC
CONNECTOR,
CONNECTOR,
RIGHT ANGLE TNC 75 DEG. ANGLE TNC
PIC: S44193
PIC: S67163
PIC: S33141
PIC: 190108
PIC: 190508
PIC: 190308
PIC: 190109
PIC: 190509
PIC: 190309
PIC: 190131
PIC: 190531
PIC: 190331
TED = TED Manufacturing Corporation
ECS = Electronic Cable Specialists, Inc.
PIC = PIC Wire And Cable
TABLE 1-2 CABLE INSTALLATIONS
C. To allow for a valid on-ground calibration, the total installed ca-
ble length plus twice the antenna height above ground must not ex-
ceed 200 feet. This will only be a practical consideration for an-
tennas mounted above 30 feet.
1.6 OPTIONAL ACCESSORIES RECOMMENDED BUT NOT SUPPLIED
A. CM 2000 CONFIGURATION MODULE KIT P/N 050-03380-0000.
PART NUMBER
DESCRIPTION
UM
EA
EA
EA
EA
RF
QTY VENDOR PART NUMBER
030-01157-0011
030-01171-0000
030-02351-0000
071-00097-0100
155-06016-0000
SOCKET CRIMP 20G
CONN SUB-D HSG 9S
HOOD AND LEVER ASSY
CM 2000 CONFIG MOD
INSTALL DWG.
10
1
POSITRONIC FC6020D-14
POSITRONIC RD09F00000-782.0
POSITRONIC D9000JVL0-476
HONEYWELL
1
1
1
N.A.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
The CM 2000 allows the KRA 405B to operate with custom altitude trip
points (rather than the factory preset values) and allows for an
offset to the zero foot readout. Refer to section 2.4 CONFIGURABLE
PARAMETERS to determine if the module is required for a particular
installation.
B. KPA 900 CONFIGURATION MODULE PROGRAMMER KIT
The KPA 900 Configuration Module Programmer Kit is required to
program the CM 2000 Configuration Module. Prior to the installation
of the CM 2000, it must be programmed to store the custom
specifications. Refer to the KPA 900 Programmer Operator’s Guide
for complete instructions.
The KPA 900 is not part of the installation but rather a piece of
equipment retained by the installer. If the installer does not have
access to a KPA 900 with current software and the CM 2000 is
required, order P/N 050-03311-0002 which contains the items listed
below.
PART NUMBER
DESCRIPTION
UM
EA
EA
EA
QTY VENDOR PART NUMBER
006-05392-00XX
050-03281-0000
222-00366-0XXX
Operator’s Guide
KPA 900 Programmer
Software Disc
1
1
1
Honeywell
Honeywell
Honeywell
XX=Highest Revision
NOTE:
For CM 2000 Configuration Modules used in ART 2000 Weather
Radar and KRA 405B Radar Altimeter Installations and CM
2000 configuration modules that have never been pro-
grammed or may have a default program for a different
unit, a “write to” initialization must be performed be-
fore writing the parameters required for the installation
into the CM 2000 configuration module. From the File menu,
load the default RDR 2000 or KRA 405B file into memory
and perform a “write to” from the hardware menu. This will
ensure that a correct default program, without errors, is
present. The default program can then be modified from
View in the memory menu. Refer to sections 1.4.2.1,
1.4.2.2, and 1.4.2.3 of the KPA 900 operators guide (006-
05392-00XX).
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
1.7 LICENSE REQUIREMENTS
The transmitter, as installed in the aircraft, requires an Aircraft Radio
Station License. This license is obtained by filing FCC Form 404. The
KRA 405B may be operated for up to 30 days without a station license, after
filing the FCC Form 404 and while awaiting the receipt of the station
license, if a copy of the FCC Form 404 is kept in the aircraft.
This equipment has been type accepted by the FCC and entered on their list
of type accepted equipment as Honeywell KRA 405B and must be identified
as Honeywell KRA 405B on your FCC Form 404, Aircraft Radio Station License
Application.
1.8 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
perform its 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.
14 CFR Part 25.1529 Instructions for Continued Airworthiness is met per
the following instructions:
A. The removal of the KRA 405B is on the condition of failure. There
is no required maintenance.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
SECTION II
INSTALLATION
2.1 GENERAL INFORMATION
This section contains general suggestions and information to consider
before installation of the KRA 405B. Close adherence to these suggestions
will assure optimum performance from the equipment.
The conditions and tests required for the TSO and MOPS approval of this
article are minimum performance standards. It is the responsibility of
those installing this article either on or with a specified type or class
of aircraft to determine that the aircraft installation conditions are
within the TSO and MOPS standards. These articles must have separate
approval for installation in an aircraft. Any features in this equipment
outside the requirements of this applicable TSO and MOPS must be evaluated
and approved as part of the installation approval. The article may be
installed only if performed under 14 CFR part 43 or the applicable
airworthiness requirements.
The unit 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
The KRA 405B should be installed in accordance with standards established
by the customer’s installing agency, and existing conditions as to unit
location and type of installation. However, the following suggestions
should be considered before installing the system. Close adherence to
these suggestions will assure a more satisfactory performance from the
equipment.
The locations chosen for units of the KRA 405B Radar System and the methods
of installation will vary with each particular type of aircraft. The units
should be installed in a convenient location for ease of operation and
accessibility for inspection and maintenance.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
The installing agency will supply and fabricate all external cables. The
connectors required for RG 393 (the preferred cable) are supplied by
Honeywell. Installation kits are also available. Consult 1.4 UNITS AND
ACCESSORIES SUPPLIED (KRA 405B SYSTEM COMPONENTS) as required.
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.
2.4 CONFIGURABLE PARAMETERS
The installer may alter some of the operational characteristics of the KRA
405B by installing a CM 2000 Configuration Module that has been programmed
with customized preferences. These characteristics are the threshold
altitudes for the three Altitude Trip Points and a selectable offset to
be applied to all altitude outputs. If these parameters are
inconsequential to the installation or the factory presets are acceptable,
the CM 2000 should not be installed.
A. ALTITUDE TRIP POINTS
The KRA 405B provides three discrete outputs called Altitude Trip
Point #1, Altitude Trip Point #2, and Altitude Trip Point.#3. The
KRA 405B asserts the discrete when operating at an altitude below
the configured trip point. The factory settings are: Altitude Trip
Point #1 at 200 feet, Altitude Trip Point #2 at 500 feet, and
Altitude Trip Point #3 at 1200 feet. If any other altitude is
desired, a programmed configuration module must be installed with
the KRA 405B.
Refer to the KPA 900 Operators Guide P/N 006-05392-OOXX for
instructions to set up the programmer, invoke the program, and
select the KRA 405B database. Select the Memory then the View
options to display the default configuration. A screen similar to
the following figure should be displayed.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
Use the cursor keys or the mouse to move the highlight bar to the
parameter that is to be adjusted.
FIGURE 2-1 KRA 405B DEFAULT TRIP POINT SETTINGS
Press the <Enter> key to display the Editing Window for the selected
Trip Point. The window should be similar to the following figure.
FIGURE 2-2 KRA 405B TRIP POINT EDITING WINDOW
Enter an integer value between 0 and 2500 at the blinking cursor.
Press the <Enter key> to accept the value.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
The Editing window will be removed and the Memory Definitions window
will again be displayed, to allow further changes, and the Main
screen will display a message describing the changed parameter.
After completing the all changes to the settings, refer to the KPA
900 Operators Guide P/N 006-05392-00XX for instructions to complete
the programming of the Configuration Module.
Honeywell recommends that the programmed module be verified before
installation. Exit the KPA 900 program, re-invoke it, read the
programmed module, and verify the correctness of the settings. This
step will ensure that the programming operation was successful.
B. ZERO FEET OFFSET
The KRA 405B Receiver/Transmitter DOES NOT require an Aircraft
Installation Delay (AID). The KRA 405B R/T has provisions to
calibrate to zero feet during the installation. After this
calibration, the KRA 405B will provide a radar altitude of basically
zero feet (see note below) when the aircraft is taxiing or
stationary on the ground.
NOTE:
All versions of the KRA 405B with 01/03 or 02/03 software
and -2001/-4001 version units with 01/03 or higher soft-
ware may provide slight negative values of altitude when
the aircraft is taxiing or at rest. This is normal oper-
ation as the altitude calculation may vary around zero at
plus and minus the system accuracy. All other unit and
software configurations will "clamp" negative calculation
results to zero feet, and never go negative. The config-
uration module supplied offset is applied to the altitude
data after the "clamp", so all unit configurations have
the capability to produce negative results.
The Honeywell EFIS 40 and EFIS 50 systems (and possibly
other systems) will not display negative altitudes re-
ceived on the digital bus. When the Honeywell EFIS detects
a negative altitude value, it "declutters" or blanks the
altitude information from the displays. The EFIS will
also rebroadcast incorrect Radio Altitude information on
the general-purpose bus.
All versions of units with 01/03 or 02/03 software and
-2001/-4001 version units with 01/03 or higher software
must not interface to the EFIS 40 or EFIS 50 systems via
the ARINC 429 bus. All flavors and software versions of
he KRA 405B must not be configured with a zero foot offset
when interfacing the EFIS via the digital bus. Interfaces
via any of the analog outputs will function correctly.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
The KRA 405B has provisions to allow some flexibility in the
altitude at which zero feet is displayed. This deviation would be
useful for installations where a zero foot reading is desired before
the landing gear compresses or when the antennas are mounted
significantly forward of the main gear. This capability is provided
by adjusting the "Zero Foot Offset" parameter in the configuration
module. If the installation is acceptable with zero feet displayed
at rest, either do not install the configuration module or keep the
default (0 feet) value for the Zero Foot Offset.
The Zero Feet Offset has the following limitations.
1. Zero Feet Offset must be a positive value
2. Zero Feet Offset must be less than 200 feet. Note that alti-
tude values less than -20 feet shall be reported as -20 feet.
3. Zero Feet Offset must be in whole feet values.
The Zero Feet Offset is programmed into the configuration module per
the Altitude Trip Point discussion, except that the ZERO-FT-OFFSET
parameter is selected from the "Menu Definitions" window. The
following figure illustrates the Zero Feet Offset editor window.
FIGURE 2-3 KRA 405B ZERO POINT OFFSET
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
NOTE:
For CM 2000 Configuration Modules used in ART 2000 Weather
Radar and KRA 405B Radar Altimeter Installations and CM
2000 configuration modules that have never been pro-
grammed or may have a default program for a different
unit, a "write to" initialization must be performed be-
fore writing the parameters required for the installation
into the CM 2000 configuration module. From the File menu,
load the default RDR 2000 or KRA 405B file into memory
and perform a "write to" from the hardware menu. This will
ensure that a correct default program, without errors, is
present. The default program can then be modified from
View in the memory menu. Refer to sections 1.4.2.1,
1.4.2.2, and 1.4.2.3 of the KPA 900 operators guide (006-
05392-OOXX).
C. KPA 900 CONFIGURATION MODULE PROGRAMMER KIT
03311-0002, is necessary to input configuration data to the
Configuration Module. This must be completed before the module is
installed. For operational procedures refer to KPA 900 Operator’s
Guide, Part Number 006-05392-00XX (XX = Latest Revision).
D. DH AUDIO OUTPUT
The KRA 405B (066-01153-0202) provides an audio output which some
operators prefer to the visual indication of Decision Height. The
audio output is intended to be connected to an audio panel as an
aural indicator of Decision Height. The audio is enabled by
connecting the DH Tone Enable discrete to an indicator such as the
KNI 415/416 which provide a switched external DH line. Audio is
enabled by pulling the discrete low; <3.5Vdc. The frequency of the
tone and the duration are controlled internally by software. See
Note 15, FIGURE 2-17 KRA 405B RADAR ALTIMETER SYSTEM INTERCONNECT,
for more information. FIGURE 2-16 EXTERNAL SONALERT shows an
external sonalert installation.
2.5 KRA 405B SYSTEM INSTALLATION
A. KRA 405B RECEIVER/TRANSMITTER
Select the KRA 405B Receiver/Transmitter installation location. The
unit may be mounted rigid, but if shock mounting is desired, allow
adequate sway space. Always allow one inch of free air space around
the top and rear of the unit.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
The selected mounting location will vary with each particular type
of aircraft. The unit should be installed in a convenient location
for accessibility for inspection and maintenance. The area should
be free from excessive vibration, heat, and noise generating
sources. The equipment and connecting cables must not interfere
with aircraft controls and other equipment.
(1) Refer to FIGURE 2-6 KRA 405B INSTALLATION DRAWING for the KRA
405B R/T mounting dimensions.
a. For tray mounted units perform the following steps:
1. Mark, punch, then drill mounting holes, being
careful not to damage adjacent equipment or ca-
bles.
2. Using four (4) #6-32 screws, secure the mounting
tray in the position selected. The fluted knob
on the mounting tray should face in a direction
to provide easy access.
3. Slide the KRA 405B R/T into the rack. Secure the
unit in place by hooking the triangular keeper
over the front lip of the unit and tightening the
fluted knob.
b. For shock mounted units perform the following steps:
1. Mark, punch, then drill mounting holes, being
careful not to damage adjacent equipment or ca-
bles.
2. Secure shock mounts to airframe.
3. Using four (4) #6-32 screws, secure the unit in
the shock mounts.
4. For shock mounted units, solid metal straps shall
be used for bonding. Straps shall be short and
broad, with a length-to-width ratio under five
(5) to minimize impedance. Solid copper straps
shall be a minimum of 0.025 inches thick and
greater than 1 inch wide. Solid aluminum straps
shall be a minimum of 0.040 inches thick.
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careful not to damage adjacent equipment or ca-
bles.
2. Using four (4) #6-32 screws, secure the unit in
the position selected.
(2) Dual Installation
The KRA 405B R/T fulfills all altitude accuracy specifications
when in dual installation mode. Mutual interaction is not
ETER SYSTEM TYPICAL ANTENNA INSTALLATIONS.
The secondary unit in a dual installation is selected by a
hardware strap as described in Note 3 of FIGURE 2-17 KRA 405B
RADAR ALTIMETER SYSTEM INTERCONNECT.
NOTE:
The operation of the primary unit is no different
than the operation of a unit in a single radar al-
timeter installation.
(3) Zero Feet Calibration
The KRA 405B Receiver/Transmitter DOES NOT require an AID.
The KRA 405B R/T has provisions to calibrate to zero (0) feet
during installation, such that the radar altitude is 0 feet
when the aircraft is taxiing or stationary on the ground. Re-
fer to section 2.6. A. POST INSTALLATION CALIBRATION for the
calibration procedure.
There are provisions to allow the indicated 0 foot point to
be offset from the calibrated 0 foot point to accommodate in-
stallations where the indicator reads 0 feet at the point the
wheels first touch down. The offset is then stored in a con-
figuration module.
B. KNI 415/416 INDICATOR
(1) Plan a location on the aircraft panel that is clearly visible
to the pilot with the least deviation from his normal scan
pattern while in an approach.
(2) Avoid mounting the unit close to heater vents or other high
heat sources.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
(3) Make certain that clearance is available between units so that
normal vibration does not cause the unit to strike adjacent
equipment cases.
(4) Allow clearance behind the unit for installation of the cables
and connectors.
(5) If an instrument hole that meets the installation requirements
front of or behind the panel. Secure the unit with mounting
ring provided and four (4) 1/2 inch long 6-32 instrument
screws.
C. ANTENNAS
The KRA 405B Radar Altimeter System requires two antennas for a
single system installation. Since the system is CW, one antenna is
used to transmit the signal and the other is used to receive the
reflected signal.
In order to meet the requirements of TSO C87/ETSO-2C87, the KRA 405B
Radar Altimeter System must use TSO certified antennas with the
MANUFACTURER
PART NUMBER
HONEYWELL DESIGNATION
MANUFACTURER
FIGURE NUMBER
DMPN 3-3A
DMPN 3-4A
AD43013-1
01-34-04531
S67-2002
KA 54
Dorne and Margolin
Dorne and Margolin
UB Corporation
2-8
KA 54
2-10
2-9
KA 54
KA 54
Comant Industries
Sensor Systems Inc.
Dorne and Margolin
Sensor Systems Inc.
2-9
KA 54A (white or black
2-11
2-11
2-12
DMPN 19-2-1
S67-2002-4
KA 54A
KA 54
NOTE:
Variances between the S67-2002 and S67-2002-4 are depicted in
FIGURE 2-12 HONEYWELL GT 7003586 (SENSOR SYSTEMS TYPE S67-2002-
4 ANTENNA). Refer to FIGURE 2-11 KA 54A ANTENNA for S67-2002-4
technical information.
TABLE 2-1 TSO CERTIFIED ANTENNAS
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
The UB Corporation, Sensor Systems, Dorne and Margolin (EDO) and
Comant Industries antennas can be purchased directly from the
respective manufacturers at the following addresses:
(1) UB Corporation
9829 Wilsky Blvd.
Tampa, FL 33615
Telephone: 813-884-1463
(2) Comant Industries, Inc.
12920 Park St.
Santa Fe Springs, CA 90670
Telephone: 562-946-6694
(3) Sensor Systems, Inc.
8929 Fullbright Ave.
Chatsworth (LAX), CA 91311
Telephone: 818-341-5366
(4) Dorne and Margolin
EDO Antenna Products and Technologies
455 Commack Road
Deer Park, NY 11729-4591
Telephone: 631-595-3275
D. PLANNING THE ANTENNA INSTALLATION
Many factors are important when planning an optimum antenna
installation for use with a radar altimeter system. Careful
planning and attention to detail are absolutely necessary. Failure
to install the antennas correctly will cause degradation in system
performance.
• Antennas should be mounted near point of aircraft rotation. This
reduces the effect of pitch and roll attitude in altitude read-
ings during approach and landing.
• Antennas must be mounted close enough to the R/T so that the an-
tenna cable length does not decrease system sensitivity. Refer
to TABLE 1-2 CABLE INSTALLATIONS for minimum and maximum lengths
and minimum bend radii for cables.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
• Antennas should be pointing straight down within plus or minus
6° when the aircraft is in a level flight attitude. Antennas
mounted more than 6° off the vertical will exhibit erratic op-
eration on the ground. See FIGURE 2-7 DUAL RADAR ALTIMETER SYS-
TEM TYPICAL ANTENNA INSTALLATIONS for examples of this type of
installation.
• Antennas may be mounted in-line or side-by-side. The in-line
mounting is the preferred choice of the two. When using side-
by-side installations, the antennas should be mounted on a flat
surface of the aircraft. The angle between the antenna center-
lines should be less than 6°.
Failure to correctly position antennas will result in erratic op-
eration on the ground, i.e., the needle will fluctuate as much
as 20 feet, dependent upon the angle between centerlines. Air-
borne operation will be satisfactory.
• Antennas should be mounted no less than 20 inches apart (measure
from center to center) in order that leakage between the antennas
remains at a tolerable level. The pointer may not stow above
2500 feet if the leakage between the antennas is too great.
• Antennas should not be separated by a distance greater than the
antenna height above the terrain at touchdown. If the antennas
are separated by more than this distance, sufficient terrain area
is not illuminated for ground level operation.
• The antennas should be mounted closer than the antenna height
above the terrain (but no less than 20 inches) if the angle be-
tween the antennas is greater than 6° .
• Antenna locations should provide 120° clearance cones. No air-
craft projection or other antenna should lie within these cones.
A fixed object in the cone could cause the altimeter to lock on
to a single altitude while a moving projection (gear, flaps,
etc.) could cause erratic operation.
• Surface area between antennas should be free from seams or other
discontinuities. NEVER mount an antenna directly on a seam. If
antennas must be separated by a seam, make sure that the two piec-
es of aircraft skin are electrically bonded together by adding
bonding straps (i.e., have multiple straps across seam separating
the two antennas).
Failure to bond properly can cause loss in system sensitivity
and/or cause the pointer to momentarily come into view above 2500
feet AGL (this phenomenon is commonly called "peeking").
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
cumulate. Water between the antenna flange and aircraft skin
will cause loss of system sensitivity and may cause peeking.
• The connectors on the KA 54 antennas should be mounted perpen-
dicular to a line drawn through the receive and transmit antennas
eter to lock on to erroneous altitudes when flying above 2500
feet AGL.
• The KA 54A antennas are oriented by observing the arrows pointed
on the outer side of the antenna. The arrows on the transmit and
receive antennas for a given unit must be on the same longitudi-
nal axis. This is achieved by having the arrow head of one an-
tenna pointing to the tail of the other antenna arrow (see FIGURE
2-7 DUAL RADAR ALTIMETER SYSTEM TYPICAL ANTENNA INSTALLATIONS).
Alternately, the two arrows may point at each other as long as
they remain on the same longitudinal axis.
If a side by side dual installation is chosen, the transmit an-
tennas from the two units should be next to each other and the
receive antennas should be next to each other (see FIGURE 2-7
DUAL RADAR ALTIMETER SYSTEM TYPICAL ANTENNA INSTALLATIONS).
E. IMPLEMENTING THE ANTENNA INSTALLATION
other insulating materials, including chromate. Apply
Alumiprep #33 (P/N 016-01127-0000) to cleanse the metal
of any residue left after removing paint or insulating
material. Protect bare aluminum surfaces with Alodine
1001 (P/N 016-01128-0000) or equivalent prior to mounting
antennas or bonding straps. Bonding resistance should be
2.6 milliohms or less for the best operation of the an-
tenna system.
• RF/Air sealing gaskets are to be installed between KA 54A mount-
ing flanges and aircraft skin.
• Minimum and maximum allowable lengths for each set of RF cables
(receive and transmit) must be appropriate for proper installa-
tion. System sensitivity suffers when cables lengths do not com-
ply with the recommended minimum and maximum lengths. (Refer to
TABLE 1-2 CABLE INSTALLATIONS).
• Make sure the cables are tight inside the cable connectors.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
• Avoid the use of right angle or bulkhead coax connectors. Volt-
age standing wave ratios (VSWR) are greater on these types of
connectors and therefore can cause problems. If bulkhead con-
nectors must be used, then connectors such as Kings Electronics
Inc. P/N KA 19-102 or equivalent must be used. If right angle
connectors must be used, they must be specified for operation at
4.3 GHz and extreme care should be exercised in their assembly.
In either case, the tests in 2.6 POST INSTALLATION should be per-
formed.
• Bends tighter than the minimum recommended bend radius can sig-
nificantly increase VSWR. (See TABLE 1-2 CABLE INSTALLATIONS for
minimum bend radii.)
• Excess cable lengths should be lashed securely but not to the
point of cutting or distorting the cable insulation. Cutting the
coax shield causes an altitude return and affects system opera-
tion.
• Tighten all antenna coax connectors slightly more than finger
tight.
CAUTION: DO NOT PAINT ANTENNA. OPERATION AND/OR ACCURACY MAY SUF-
F. ANTENNA CABLES
After the location of the antennas has been determined, a minimum
length of antenna cable required for the installation may be gauged.
Measure the distance from the receiver and the transmitter
connectors (located on the front of the KRA 405B) to each antenna
adding enough extra length to avoid obstructions in the cable path
and to allow for connection to the antenna connector.
System sensitivity suffers when cables lengths do not comply with
the recommended minimum and maximum lengths.
NOTE:
Refer to TABLE 1-2 CABLE INSTALLATIONS to establish min-
imum and maximum cable lengths.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
G. WIRING HARNESS
FIGURE 2-14 CONNECTOR PIN LOCATIONS shows the KRA 405B R/T mating
connector pin connections and the KNI 415/416 mating connector pin
locations. Refer to FIGURE 2-17 KRA 405B RADAR ALTIMETER SYSTEM
INTERCONNECT as required.
During preparation of the wiring harness, the following precautions
should be acknowledged:
• Bond and shield all parts of the aircraft electrical system such
as generators and ignition systems.
• Keep the cables away from circuits carrying heavy current, pulse-
transmitting equipment, 400 Hz circuits, and other sources of in-
terference.
• Make all external connections of the equipment through designated
connectors listed on the diagram.
• Wire size is specified on the interconnect diagram.
• Leave slack in cables to allow for free sway of the equipment.
• After installation of the cables in the aircraft and before in-
stallation of the equipment, a check should be made to ensure
that the aircraft power is applied only to the pins specified.
H. CONFIGURATION MODULE INSTALLATION
The KRA 405B interfaces to the CM 2000 Configuration Module.
The configuration module is an option that is only needed for
installations that require the trip points to be set to a value other
than the factory settings, or for installations requiring a zero
feet offset. Negative values cannot be displayed by EFIS 40/50
indicators when interfaced to the radar altimeter via ARINC 429.
The maximum cable length between the configuration module and the
KRA 405B shall not exceed two (2) feet.
NOTE:
It is desirable to keep this cable length as short as pos-
sible.
Refer to FIGURE 2-18 CM 2000 CONFIGURATION MODULE MOUNTING DRAWING
for the CM 2000 mounting dimensions.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
To program the configuration module, a KPA 900 with software 222-
00366-0002 or greater is needed (See section 1.6. B. KPA 900
CONFIGURATION MODULE PROGRAMMER KIT).
Follow the instructions in the KPA 900 operator’s manual (006-05392-
00XX) which is included in the KPA 900 Configuration Module
Programmer Kit to perform the programming. The KRA 405B uses a
configuration module type CM 2000 P/N 071-00093-0100.
2.6 POST INSTALLATION
A. POST INSTALLATION CALIBRATION
The KRA 405B DOES NOT require an AID to cause the display of zero
feet while on ground. Variations in antenna cables and antenna
height are resolved during a one-time calibration procedure. The
result of the calibration is retained indefinitely internal to the
KRA 405B.
The following conditions must be met before initiating the
calibration.
1. The KRA 405B, indicator, and antennas must be installed. The
2. The calibration must be accomplished outside of the hanger
with no obstacles surrounding or underneath the aircraft. Ex-
traneous reflections may cause an incorrect calibration.
3. Allow a minimum of three minutes of warm-up time before ini-
tiating the calibration.
4. Installations with dual radar altimeter system must calibrate
each side separately. The unused side must either be unplugged
or the circuit breaker disabled so as to prevent the possi-
bility of interference with the side being calibrated.
The calibration is accomplished by pressing the recessed switch (SW
1) on the front of the KRA 405B (see FIGURE 2-4 KRA 405B POST
INSTALLATION CALIBRATION SWITCH). Note that this switch is
intentionally difficult to press. It must be pressed through a hole
in the front panel with a tool no greater than 0.12 inches in
diameter for at least 0.2 inches. Hold the switch for at least ten
seconds to ensure that the KRA 405B accepts the switch press.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
FIGURE 2-4 KRA 405B POST INSTALLATION CALIBRATION SWITCH
Verify proper on ground performance after the calibration is
complete. For systems without a zero feet offset programmed into the
configuration module, this will be an indication of zero feet plus
or minus the system tolerance of two or three feet. For systems with
a zero feet offset programmed into the configuration module, this
will be an indication of the negative value of the zero feet offset
plus or minus the system tolerance of two or three feet. Note that
the analog indicators may not allow quantifiable negative
indications.
A KRA 405B with software 01/04, 02/04, or higher contain
enhancements to the calibration routine.
1. When the calibration is in process, the KRA 405B will output
an altitude of 500 feet. This relieves the 10-second switch
requirement. The switch may be released as soon as the indi-
cator displays 500 feet. If the indicator does not display 500
feet, the switch has not been adequately pressed.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
2. A calibration in an excessively noisy environment will not be
accepted by the KRA 405B. A post calibration altitude of thir-
ty to one hundred feet indicates a failed calibration. If this
condition occurs, the calibration must be completed in a dif-
ferent location.
B. GENERAL
In most cases altimeter installations that closely follow the
suggestions of this manual will need no special equipment to check
405B RADAR ALTIMETER POST INSTALLATION TEST PROCEDURE are sufficient
to determine proper altimeter operation.
However, if more than one of the installation suggestions in this
document cannot be complied with, the probability increases that a
problem will exist.
In order to determine whether an altimeter installation problem does
exist, the tests in Paragraphs 2.6. C. KRA 405B RADAR ALTIMETER POST
INSTALLATION TEST PROCEDURE and D. TEST PROCEDURE can take the place
of a flight test.
Agencies that install many altimeter systems (including other
manufacturer’s equipment) will find these test procedures quite
helpful. For the majority of installation problems encountered, the
procedures in Paragraph 2.6. C. KRA 405B RADAR ALTIMETER POST
INSTALLATION TEST PROCEDURE should prove sufficient.
Before initiating the test, check the physical condition of the
units, cables, and the areas around the installations. Ensure that
all cable connections are correct and that all mounts and connectors
are secure.
C. KRA 405B RADAR ALTIMETER POST INSTALLATION TEST PROCEDURE
(USING MICROWAVE ABSORBER)
(1) Purpose of Test
The purpose of the following post installation test procedure
is to insure that the indicator needles will stow behind the
mask after the test button is pressed.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
It also ensures the absence of an RF leakage path allowing the
4.3 GHz transmitter output to bleed into the system’s receiv-
er, thus bypassing the normal antenna-to-ground-to-antenna
path while flying above 2,500 feet AGL.
The following procedure duplicates a flight altitude greater
than 2,500 feet AGL in order to find these RF leakage paths.
(2) Required Equipment
The items listed below, or their electrical equivalent, may
be used to conduct the tests in this paragraph.
QUANTITY
DESCRIPTION
MANUFACTURER
MANU. PART NUMBER
AN 75
2
Microwave Absorber
Emerson & Cummins
Tel: (800) 650-5740
or: (781) 961-9600
(1 ft sq.)
2
2
TNC Female Barrels
TNC Male Loads
Americon
Microlab
3180-0000
FXR TA-SMT
(3) Test Procedures
a. Turn on aircraft primary power.
b. Adjust the DH knob on the indicator to set the DH bug
to 25 feet.
c. Depress the test button on the indicator. The altitude
indicated should be 50 5 feet and the DH lamp should
be out.
d. Slowly advance the DH bug until the DH lamp lights. The
bug should be set at 50 5 feet at this time. Continue
increasing the DH bug setting. The DH lamp should stay
lit.
e. Release the test button. The indicated altitude should
now be 0 5 feet.
NOTE:
In some installations, the tolerances given
here may be greater, due to antenna location
and a difference between aircraft touch down
attitude and parked attitude.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
f. Place a one (1) foot square or larger piece of the mi-
crowave absorber over each KRA 405B Antenna. The KRA
405B should unlock and the Indicator pointer should
drive clockwise behind the mask.
NOTE:
It may be necessary to remove the aircraft
from the hanger, away from other aircraft
and/or other sources of reflection in order
to achieve an unlock condition (pointer be-
hind mask) with the microwave absorber.
While keeping the Antennas covered with the microwave
absorber, reconfirm that the self-test is operational
by repeating steps b. through d. above. Release the
test switch. The pointer should again go behind the
mask.
g. If the indicator pointer does not stow behind the mask
in Step f. above, check for a faulty RF cable or TNC
connector at the R/T by exchanging the antenna coaxes
cables at the R/T. Repeat Step f.
If the pointer still does not stow, disconnect the an-
tenna cable from the R/T unit’s receiver port (upper
connector) and terminate the receiver port with a 50 ohm
load. Load the transmitter antenna into the RF absorb-
er. The indicator pointer should stow behind the mask.
Repeat this test for the transmitter port (lower port),
and again the indicator should stow behind the mask.
Note which R/T port, when terminated, causes the indi-
cator needle to stow, and continue troubleshooting in
that direction.
If the R/T will not stow the indicator needle with ei-
ther the Transmitter or the Receiver port terminated
into a 50 ohm load, the R/T unit should be bench tested.
If the indicator pointer can be stowed with both ports
terminated, reinstall the correct cables on the trans-
mitter and receiver ports and remove the cables at the
antenna.
Terminate these cables into the 50 ohm load one at a
time while placing the microwave absorber over the other
antenna.
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An antenna fault will be detected when its cable is ter-
minated into a 50 ohm load and the indicator needle will
stow behind the mask. Re-bond the antenna if the point-
er is now stowed.
If the indicator pointer still does not stow, this in-
dicates an RF cable or connector problem. Remove both
cables at the antenna and terminate one of them with a
50 ohm RF load. Remove the other cable at the R/T end
and terminate with a 50 ohm RF load. The indicator nee-
dle should stow behind the mask.
h. Repeat this test for the other cable. A fault here can
be addressed by following the suggestions in 2.5 KRA
405B SYSTEM INSTALLATION pertaining to the cables.
D. TEST PROCEDURE
KRA 405B Radar Altimeter Post Installation Test Procedures using
1000 Foot Delay Line.
(1) Purpose of Test.
This test simulates an actual altitude of 1000 feet AGL with
various return signal strengths. Low power output, poor coax
cables, poor connectors and poor R/T performance can be found
using this method.
(2) Required Equipment
The items listed below or their electrical equivalent, may be
used to conduct the tests in this section.
QUANTITY
DESCRIPTION
MANUFACTURER
Teledyne
Narda
MANU. PART NUMBER
M7421B
1
1
1000 ft Delayline
Attenuator Variable
4-8 GHz 0-40 dB
794-FM
2
2
Attenuator Fixed
3-6 GHz 20 dB
Narda
773-20
Adapter N to SMA
Americon
2082-2300
F
P/N 030-00123-0000
2
1
1
Adapter N to TNC
Amphenol
Amphenol
78800
78875
M
F
M
Adapter N to TNC
M
6 ft RG 393/U with TNC con-
M
nector
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
(3) Test Procedure
a. Connect the test equipment as shown in FIGURE 2-15 KRA
405B TEST EQUIPMENT SETUP, replacing the antennas in the
installation.
b. Adjust the variable attenuator to 0 dBm (this setting
yields approximately 65 dBm loop loss). The KNI 415/
416 should indicate 900 to 1100 feet.
c. Slowly increase the variable attenuator until the KNI
415/416 pointer goes clockwise behind the mask.
During this operation, the pointer should continue to
indicate the previous altitude; 10 feet. After the
pointer stows, the total attenuation in the line should
be 102 dB minimum (40 dB + Attenuation in Delayline +
Variable Attenuation).
d. Pointer movement while adjusting the variable attenua-
tor in Step c. indicates a possible problem in the an-
tenna coax.
Connect the test equipment directly to the R/T trans-
mitter port and connect to the receiver port via the 6
foot test cable.
Try Step c. again. Pointer movement while adjusting the
variable attenuator indicates a possible R/T problem.
The R/T should be bench tested to insure proper opera-
tion.
e. When Step c. attenuates a level of less than 102 dB to
unlock the system, this can be an indication of possible
low TX power output. Reconnect the equipment as in Step
d. The pointer should stow at an attenuation of 110 dB
minimum
(40 dB + Attenuation in Delayline + Variable Attenua-
tion).
f. Should the unit now exhibit proper operation, check the
antenna cables for total length greater than 34 feet
(remember, RG 393/U attenuation per foot at 4.3 GHz is
.20 dB, therefore, length greater than 34 feet may im-
pair system performance).
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
(4) Simulated Altitude Test Procedure
The Simulated Altitude Test Procedure is to be used by the
installer to test associated systems that interface with the
KRA 405B. In the Simulated Altitude Test Mode, all outputs
of the KRA 405B operate normally, except that they are con-
trolled by a test input voltage rather than altitude. This
test voltage controls all analog and digital outputs, and all
three trip points.
a. Enter the Simulated Altitude Test Mode by pulling the
ALTITUDE TEST EN1 and ALTITUDE TEST EN2 lines low, ≤
3.5V. (EN1 is pin n, EN2 is pin s, and Altitude Test
Input is pin m). The KRA 405B outputs will now be con-
trolled by the voltage applied to the ALTITUDE TEST IN-
PUT pin on the circular connector.
b. The test voltage range is from 0 to 25 volts, with 0
volts corresponding to 0 feet, and 25 volts correspond-
to 25 volts, and back down to 0 volts. Confirm that the
altimeter indicates a corresponding change in altitude
(0 feet to 2500 feet, and back to 0 feet), and that the
DH Lamp illuminates at the appropriate time.
c. Remove the low from the ALTITUDE TEST EN1 and EN2 input
lines. This returns the KRA 405B to the Operational
Mode. Voltages on the ALTITUDE TEST INPUT line will no
longer affect the indicated altitude.
2.7 REMOVAL AND REPLACEMENT
A. KRA 405B RECEIVER/TRANSMITTER
(refer to FIGURE 2-6 KRA 405B INSTALLATION DRAWING for details)
(1) Removal
a. Detach mating coaxial cables from XMIT (P4052) and RCVR
(P4053) TNC connectors on the front of the unit.
b. Detach mating cable from Cannon connector (P4051) on the
front of the unit.
c. For Rack Mount, follow procedure outlined in step 1,
For Shock Mount and Direct Mount, follow procedure out-
lined in step 2,
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
1. Loosen fluted retaining screw clamp, located on
the front of the mounting rack, remove triangular
keeper from the front lip of the unit, and slide
unit out of the rack.
2. Remove (4) #6-32 screws, securing unit to mounts,
and remove.
(2) Re-installation
a. For Rack Mount, follow procedure outlined in step 1,
For Shock Mount and Direct Mount, follow procedure out-
lined in step 2,
1. Slide the unit into the rack. Hook the triangular
the fluted retaining screw clamp located on the
front of the mounting rack until secure.
2. Align unit with mounting holes and secure with (4)
#6-32 screws.
b. Re-attach mating cable to Cannon connector (P4051) on
the front of the unit.
c. Re-attach mating coaxial cables to XMIT (P4052) and RCVR
(P4053) TNC connectors on the front of the unit.
B. KNI 415/416 INDICATOR
(refer to FIGURE 2-5 KNI 415/416 INSTALLATION DRAWING for details)
(1) Removal
a. Detach mating cable from Cannon connector (P4151/P4161)
on the back of the unit.
b. Remove (4) #6-32 screws, securing unit to panel. Unit
may be front or rear mounted relative to panel.
(2) Re-installation
a. Align unit with panel mounting holes and secure with (4)
#6-32 screws. Unit may be front or rear mounted rela-
tive to panel.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
b. Re-attach mating cable to Cannon connector (P4151/
P4161) on the back of the unit.
C. ANTENNAS
(Refer to FIGURE 2-8 KA 54 ANTENNA OUTLINE AND MOUNTING DRAWING
through FIGURE 2-12 HONEYWELL GT 7003586 (SENSOR SYSTEMS TYPE S67-
2002-4 ANTENNA))
Refer to section 2.5. E. IMPLEMENTING THE ANTENNA INSTALLATION for
additional information and suggestions relating to installation of
antennas.
(1) Removal
a. Detach mating coaxial cable from antenna TNC connector.
b. Remove the fasteners attaching the antenna to the air-
frame. (The number and pattern will vary depending on
antenna type, consult proper antenna mounting drawing
for details).
(2) Re-installation
a. Align antenna with panel mounting holes and secure with
fasteners. (The number and pattern will vary depending
on antenna type, consult proper antenna mounting draw-
ing for details).
b. Re-attach mating coaxial cable to antenna TNC connec-
tor.
2.8 HONEYWELL MAINTENANCE RECOMMENDATIONS
The KRA 405B Radar Altimeter System has been designed for “on-condition”
maintenance. For details relating to “on condition” maintenance, refer
to Honeywell Service Memo SM #292, P/N 600-08292-XXXX.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
FIGURE 2-7 DUAL RADAR ALTIMETER SYSTEM TYPICAL ANTENNA INSTALLATIONS
(Page 2 of 2)
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
FIGURE 2-11 KA 54A ANTENNA
(SENSOR SYSTEMS TYPE S67-2002 & DORNE AND MARGOLIN TYPE DMPN 19-2-1)
OUTLINE AND MOUNTING DRAWING, (P/N 071-01501-0000, R-AE)
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
NOTE:
Proper operation of a Radar Altimeter System depends upon the
VSWR of the antenna cable. Therefore, extreme care must be ex-
ercised in assembling the TNC connector to the RG 393/U cable.
Strict adherence to the above instructions will ensure a good
VSWR of the antenna cables.
FIGURE 2-13 TNC COAX/CONNECTOR ASSEMBLY (RG 393/U)
(P/N 030-00108-0004)
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
KRA 405B MATING CONNECTOR (P4051)
P/N 030-02077-0000
KRA 415/416 MATING CONNECTOR (P4151/P4161)
P/N 030-02210-0001
FIGURE 2-14 CONNECTOR PIN LOCATIONS
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
SECTION III
OPERATION
3.1 GENERAL
The KNI 415 and KNI 416 Radar Altimeter Indicators are shown in FIGURE 3-
1 KNI 415 CONTROL FUNCTIONS and FIGURE 3-2 KNI 416 CONTROL FUNCTIONS and
are discussed below.
• Altitude Scale:
The KNI 415 scale gives accurate altitude indications from -20 to +2000
feet. From -20 to 500 feet each mark on the scale represents 10 feet.
From 500 to 2000 feet, each mark represents 100 feet.
The KNI 416 scale gives accurate altitude indications from -10 to +2000
feet. From -10 to 200 feet each mark represents 5 feet, from 200 to
500 feet each mark represents 20 feet, and from 500 to 2000 feet each
mark represents 100 feet.
• Indicator Needle:
The AGL altitude in feet is displayed beneath this needle. Needle will
be clockwise behind mask when above 2000 feet.
• Flag:
Indicates invalid altitude information is being displayed or self test
button is depressed.
• Self Test Button:
This button is used to test the Radar Altimeter R/T and indicator. When
the button is depressed, the flag will come into view and 50 5 feet
will be displayed.
• DH Knob:
This knob controls the DH (Decision Height) bug. By turning it clock-
wise, the DH bug will increase in altitude; counterclockwise, the bug
will decrease in altitude.
• DH Bug:
Indicates altitude during an approach at which the DH lamp will light.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
• DH Lamp:
This lamp lights when the Decision Height is reached. The lamp can be
turned off by pushing the lamp in. The lamp can be turned on again,
when below the decision height, by depressing the lamp a second time.
Once turned off, the DH lamp will be automatically armed upon climb out
as the aircraft passes through the DH altitude. Pressing the self-test
button will also turn on the DH lamp if the DH bug is set above 50 feet.
3.2 NORMAL OPERATION
A. PREFLIGHT
(1) Turn on primary aircraft power.
(2) Adjust the DH knob on the KNI 415/416 Radar Altimeter Indica-
tor to set the DH bug to 25 feet.
(3) Depress the TEST button. The indicated altitude should be 50
5 feet and the flag should come into view. The DH lamp
should be out.
(4) With the TEST button depressed, slowly increase the DH bug
until the DH lamp lights. The bug should be 50 5 feet. The
lamp should be lit at all altitudes above 50 feet.
(5) Release the TEST switch. The warning flag should move out of
view and the indicated altitude should be 0 feet, nominal.
B. TAXI
When taxiing to and from the ramp, the DH light option may be turned
off by simply pressing the DH lamp. Once off, the lamp may be turned
on again by pressing the DH lamp or pressing the TEST button, if the
DH bug is set above 50 feet. Climbing past the decision height
(indicated by the DH bug) arms the DH lamp so during the approach
the lamp will light upon reaching the decision height.
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
C. IN FLIGHT OPERATION
At normal cruise altitudes above 2000 feet, the indicator pointer
is behind the mask and the warning flag is hidden from view above
2,500 feet. A Flight Control System (FCS) warn is a failure warning
signal to systems requiring accurate above ground level (AGL)
altitude information. The FCS warn presents a red flag during
operation above 2000 feet, during self test, loss of power, and loss
of signal strength to alert the pilot to possible failures.
D. APPROACH
During the actual approach, the Radar Altimeter System provides
altitude and altitude trip information to the Flight Control System.
When the approach plans are reviewed prior to beginning the actual
approach, the pilot should set the DH bug to the decision height
altitude, and check altimeter operation. When decision height is
reached, the DH Lamp lights to alert the pilot that a decision should
be made. The DH Lamp may then be turned off by pressing the lamp in.
E. PUSH-TO-TEST MODE
(1) To check altimeter operation, depress the TEST button. The
following should be noted on the altimeter:
a. 50 5 feet should be indicated.
b. The flag should come into view.
c. The DH lamp should light (if the DH setting is above 50
feet).
d. Verify that the pointer comes on scale at 2000 feet AGL
by using the baro corrected barometric altitude as a
reference. (This reference is for self test only and
should not be used as an absolute altitude).
(2) If altimeter does not operate as specified above, refer to
Self-Test Diagnostics, paragraph 3.3 SELF-TEST DIAGNOSTICS .
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
3.3 SELF-TEST DIAGNOSTICS
SYMPTOM
ACTION REQUIRED
Altimeter does not indicate 50
5 feet.
The Radar Altimeter System is in-
operative. Repair is required.
Flag does not come into view,
but indicated altitude is cor-
rect.
Indicator Failure. Radar Altime-
ter System failures may not be
indicated by a flag. Repair is
required.
DH Lamp fails to light.
Indicator Failure. The decision
height will not be annunciated.
Repair is required.
The altimeter indicates 100
feet.
The system’s receiver/transmit-
ter is inoperative. Repair is re-
quired.
The altimeter indicates 200
feet.
Configuration module failure. Re-
pair is required. (This is ap-
plicable in systems that have
configuration modules).
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
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