ARTEX AIRCRAFT SUPPLIES B406-4 Instruction Manual

ARTEX 406 MHz EMERGENCY
LOCATOR TRANSMITTERS
B406-4
Artex Aircraft Supplies, Inc.
14405 Keil Road NE
Aurora, OR 97002 USA
Phone: [phone] FAX:[phone]
www.artex.net
Artex Aircraft Supplies, Inc. doing business as Cobham Avionics
DESCRIPTION, OPERATION, INSTALLATION
AND MAINTENANCE MANUAL
DOCUMENT NUMBER: 570-5004 REV. C

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REVISION HISTORY
REVISION DOCUMENT CHANGE NOTICE DATE
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Table of Contents
SYSTEM DESCRIPTION ..........................................................1-1
SYSTEM DESCRIPTION................................................................1-2
LINE REPLACEMENT UNITS (LRU)..........................................................1-4
FIGURE 1-1 G-SWITCH CURVE..............................................................1-4
TRANSMITTER CHARACTERISTICS ...........................................1-5
121.5/243.0 MHz TRANSMITTER ...............................................................1-5
406.025 MHz TRANSMITTER .....................................................................1-5
FCC REQUIREMENTS...................................................................1-5
TSO REQUIREMENTS...................................................................1-6
ACTIVATION MONITOR...............................................................................1-6
G-SWITCH .....................................................................................................1-6
BATTERY PACK ...........................................................................................1-6
REMOTE CONTROL ....................................................................................1-7
Artex Antennas .............................................................................1-7
ROD ANTENNA ............................................................................................1-7
BLADE ANTENNAS ......................................................................................1-7
FIGURE 1-2 ROD ANTENNA (110-320)..................................................1-9
FIGURE 1-3 BLADE ANTENNA (110-337)..............................................1-9
FIGURE 1-4 BLADE ANTENNA (110-333)............................................1-10
FIGURE 1-5 BLADE ANTENNA (110-328-01) ......................................1-10
B406-4 OPERATION ................................................................2-1
Operation........................................................................................2-2
Overall Functions..........................................................................2-2
FIGURE 2-1 ELT FUNCTIONAL FLOW ..................................................2-3
INSTALLATION .........................................................................3-1
Basic Overview .............................................................................3-2
FIGURE 3-1 ELT AND REMOTE SWITCH PANEL...............................3-2
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ELT Mounting Locations .............................................................3-3
FIGURE 3-2 MOUNTING TRAY INSTALLATION ...................................3-3
Figure 3-3 ELT Outline Dimensions .........................................3-4
Figure 3-4 Blade Antenna Outline 110-337 .............................3-5
Figure 3-5 Rod Antenna Outline 110-320 ................................3-6
FIgure 3-6 Blade Antenna Outline 110-333 .............................3-7
Figure 3-7 Blade Antenna Outline 110-328-01 ........................3-8
Antenna Mounting Locations ....................................................3-9
FIGURE 3-8 REMOTE PANEL OUTLINE DIMENSIONS.....................3-10
Installing the Mounting Tray ....................................................3-10
Installing the Antenna ...............................................................3-11
FIGURE 3-9 ELT MOLEX CONNECTOR INSTALLATION ..................3-11
Mounting the Cockpit Panel Switch Assembly ....................3-12
Wiring the ELT System.............................................................3-12
Fabricate the Cable ....................................................................................3-12
FIGURE 3-10 WIRING DIAGRAMS ......................................................3-13
FIGURE 3-11 ELT-TO-REMOTE PANEL INTERFACE DIAGRAM......3-14
FIGURE 3-12 BUZZER BRACKET .........................................................3-15
Connecting the ELT....................................................................................3-15
Wiring the Panel Assembly Connector.....................................................3-16
Power and Ground .....................................................................................3-16
Buzzer Installation .......................................................................................3-16
Finishing Up ................................................................................................3-16
Transmitter Test..........................................................................3-17
Sealing the ELT Connector ......................................................3-19
Helicopter Installations ..............................................................3-19
PERIODIC MAINTENANCE......................................................4-1
In the United States ....................................................................4-2
In Canada.......................................................................................4-2
Periodic Maintenance Inspection Procedure ...........................4-2
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FIGURE 4-1 PERIODIC MAINTENANCE CHECKLIST ..........................4-3
Step 1 Remove ELT Connections..............................................................4-4
Step 2 Remove ELT ....................................................................................4-4
Step 3a Remove Battery Pack ...................................................................4-4
Step 3b Replace/Reinstall Battery Pack ....................................................4-5
Step 4 G-Switch Check ...............................................................................4-5
Step 5a Electrical Check .............................................................................4-5
Step 5b 121.5/243.0 MHz Power Output ..................................................4-5
Step 5c 121.5 MHz Frequency...................................................................4-6
Step 5d Audio Modulation ...........................................................................4-6
Step 5e Measure 406.025 MHz Power .....................................................4-6
Step 5f Measure 406.025 MHz Frequency ...............................................4-7
Step 5g Current Draw Tests.......................................................................4-7
FIGURE 4-2 TEST HARNESS CONNECTION .......................................4-8
Step 5h Verification of Digital Message ....................................................4-9
FIGURE 4-3A BEACON TEST SET DISPLAYS ...................................4-10
FIGURE 4-3B BEACON TEST SET DISPLAYS .....................................4-11
Step 5i Reset ELT .....................................................................................4-13
Step 6 Reinstall ELT..................................................................................4-13
Step 7 Installed Transmitter Test .............................................................4-13
Figure 4-4 ELT/Battery Pack Exploded View..........................................4-14
Step 8 Antenna Test..................................................................................4-15
Step 9 Logbook Entry................................................................................4-15
Summary of Minimum Requirements......................................4-15
Specifications @ 121.5 MHz .....................................................................4-15
Specifications @ 243.0 MHz .....................................................................4-15
Specifications @ 406.025 MHz.................................................................4-15
Transmitter Test ..........................................................................................4-15
ELT Battery Pack Replacement ...............................................4-16
SPECIFICATIONS & APPROVALS.........................................5-1
SPECIFICATION TABLES...................................................................5-2 - 5-4
B406-4 Model Description ...........................................................5-5
Approvals .......................................................................................5-6
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APPENDIX A: DOCUMENTATION & LICENSE DATA .......A-1
Available Documentation ............................................................A-2
Radio Station License Data .......................................................A-2
APPENDIX B: REGISTRATION REQUIREMENTS ...............B-1
Registration ...................................................................................B-2
APPENDIX C: SYSTEM COMPONENT PART NUMBERS..C-1
System & Sub-component Part Numbers ...............................C-2
APPENDIX D: ELT/NAV INTERFACE OPERATION ............D-1
ELT/NAV Interface Capability.....................................................D-2
ELT/NAV Interface Communication Formats ...........................D-3
Installation and Checkout Process...........................................D-3
24 Bit Address Installation Test...............................................D-4
ELT to NAV Interface Information ............................................D-6
DGL-1 “Dongle”............................................................................D-6
FIGURE D-1 ELT/NAV INTERFACE INSTALLATION OVERVIEW ......D-7
FIGURE D-2 ELT/NAV INTERFACE TO ELT WIRING DIAGRAM........D-8
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ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5004
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SYSTEM DESCRIPTION

ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5004
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1.1. SYSTEM DESCRIPTION
·System Description Update:
The purpose of this update is to ad-
dress the 406.0-406.1 MHz transmitter
frequency window and the specific fre-
quency band allocations residing above
406.025 MHz, beginning with 406.028
MHz, that are assigned or reserved
within the 406.0-406.1 MHz distress
frequency window.
The references to the 406 MHz
transmitter frequency of the ELT are
stated throughout the manual as
406.025 MHz. Implemetation of
changes to the 406 MHz transmitter,
as may occur since the original re-
lease of the product, could necessitate
that the frequency be changed based
on the requirements of COSPAS/
SARSAT frequency allocation as de-
fined in document C/S T1.02
(”COSPAS/SARSAT 406 MHz Fre-
quency Management Plan”). While the
original Model(s) ELT covered in this
manual transmitted on 406.025 MHz,
the current state Model(s) ELT may
not.
The product identification label on
each ELT specifies the transmitting
frequencies of that individual ELT. The
406 MHz component may be 406.025,
406.028, 406.037 MHz, etc. The allo-
cation of frequencies based on beacon
population per specified frequency
band is controlled by COSPAS/
SARSAT. The frequency references
throughout this manual for the 406
MHz component should be considered
the baseline and the specific fre-
quency indicated on the ELT’s product
label substituted, if different than
406.025 MHz, whenever the 406.025
MHz frequency reference is encoun-
tered in the manual.
NOTE: Beacon frequencies assigned
or reserved by COSPAS/SARSAT
range from 406.0-406.1 MHz. Code of
Federal Regulations (CFR) Title 47
(Telecommunications), subpart 87,
paragraph 87.199 “Special Require-
ments for 406.0-406.1MHz ELTs” re-
flects the harmonization with
COSPAS/SARSAT on the 406 MHz
frequency span.
RTCA/DO-204, Change 3 (June 12,
2001) revised the frequency tolerance
of 406.028 MHz to +/-1KHz. This be-
came effective January 01, 2002. This
tolerance applies to allocated frequen-
cies going forward from 406.028 MHz.
This frequency tolerance correlates to
the requirements of COSPAS-SARSAT
document C/S T.001 (Specification for
COSPAS-SARSAT 406 MHz Distress
Beacons).
*****************************
The ARTEX B406-4 ELT is a “third
generation" ELT transmitting on 121.5,
243.0 and 406.025 MHz. The ELT is
designed to meet or exceed the re-
quirements of TSO C91a, TSO C126
and the mandatory automatic ELT re-
quirements of FAR Part 91. The ELT
meets the requirements of Canadian
Aviation Regulations (CAR) Part V,
Subpart 51, Airworthiness Manual Sec-
tion 551.104. In addition, this ELT is
designed to meet the requirements of
Eurocae ED-62.
The B406-4 ELT employs a com-
pletely new transmitter which features
higher output power and a more inte-
grated design. The 121.5/243.0 MHz
section of the transmitter is contained
in a module with the 406.025 MHz
transmitter. The top circuit board con-
tains the microprocessor that controls
the module and all ELT functions. The

B406-4 is a dual output ELT, as all
previous models of Artex 406 MHz
ELT’s have been.
The ELT automatically activates dur-
ing a crash and transmits the stan-
dard swept tone on 121.5 and 243.0
MHz. Every 50 seconds for 520 milli-
seconds (long message protocol) the
406.025 MHz transmitter turns on.
During that time an encoded digital
message is sent to the satellite. The
information contained in that message
is shown below:
·Serial Number Of The Transmitter or
Aircraft ID.
·Country Code
·I.D. Code
·Position Coordinates (when coupled to
an ARTEX ELT/NAV Interface -B unit
[453-6501])
Refer to Appendix D (ELT/NAV Inter-
face Capability) for a detailed discus-
sion of the interaction between the
ELT, the ELT/NAV Interface unit and
the aircraft navigation system.
The 406.025 MHz transmitter will op-
erate for 24 hours and then shuts
down automatically. The 121.5/243.0
MHz transmitter will continue to oper-
ate until the unit has exhausted the
battery power which typically will be at
least 72 hours.
The ELT/NAV Interface unit allows
the ELT to communicate with the air-
craft’s navigation system and receive
position data (longitude and latitude)
which the ELT will transmit in the
event of a crash. Programming the
ELT with the 24 bit long message
protocol allows the ELT to be auto-
matically programmed by the ELT/NAV
Interface with the aircraft’s 24 bit ad-
dress. The ELT/NAV Interface unit
must be strapped (binary “1" bits tied
to ground) with the same 24 bit ad-
dress as the ICAO or Mode S tran-
sponder system 24 bit address. This
gives the ELT the ability to be moved
from one aircraft to another without
the need for manual reprogramming of
the ELT. This is advantageous for
fleet operators since the ELT/NAV In-
terface unit will automatically repro-
gram the ELT with the new aircraft’s
24 bit address identification.
One advantage of the 406.025 MHz
transmitter is that it will produce a
much more accurate position fix, typi-
cally 1 to 2 kilometers as compared
to 15 to 20 kilometers for 121.5/243.0
MHz transmitters.
When coupled with the aircraft’s nav-
igation system the position accuracy
improves to approximately 100 meters.
The ELT also transmits a digital mes-
sage which allows the search and
rescue authorities to contact the
owner/operator of the aircraft through
a database. Information contained in
the database that may be useful in
the event of a crash is shown below:
·Type of Aircraft
·Address of Owner
·Telephone Number of Owner
·Aircraft Registration Number
·Alternate Emergency Contact
Once the ELT is activated and the
406.025 MHz signal is detected from
the satellite and a position is calcu-
lated, the 121.5/243.0 MHz transmis-
sions are used to home in on the
crash site. Because aircraft communi-
cation radios are not capable of re-
ceiving 406.025 MHz transmissions,
the only method of monitoring the
ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5004
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ELT is the blinking cockpit light, the
buzzer or the 121.5/243.0 MHz trans-
missions which may be monitored on
the aircraft communication transceiver.
The switch below the ELT cockpit
light allows you to turn the unit on for
testing and to reset the unit. You can-
not “disarm” or disable the unit from
the cockpit. Cockpit operation is lim-
ited to deactivating the ELT after it
has been activated, or manually acti-
vating the ELT.
The B406-4 ELT is housed in a high
impact fire resistant polycarbonate
plastic case. The ELT unit is able to
withstand extremely harsh environ-
ments. Units, exactly like yours, have
been subjected to numerous 500g
shock pulses, 1000 pound crush
weights and severe penetrator tests,
and continue to operate normally.
Continued operation in a temperature
range of -20 degrees C through +55
degrees C is assured.
1.1.1. LINE REPLACEMENT
UNITS (LRU)
1.1.2. The B406-4 system consists of
the following components:
ELT Unit
·a. G-Switch
·b. Transmitter
·c. Microprocessor
·d. Miscellaneous components
·e. “ON” Light
·f. Transmitter Module
Battery Pack
Fixed Antenna
Connecting Coax Cable
Mounting Tray
ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5004
02/26/08 PAGE 1-4
FIGURE 1-1 G-SWITCH CURVE

Protective Top Cover
Mounting Tray End Cap
Cockpit Remote Switch Assembly
Buzzer
Installation Kit
1.2. TRANSMITTER CHAR-
ACTERISTICS
The printed circuit assembly (PCA) of
the B406-4 ELT is unique in that the
PCA has no RF function but rather
only control functions for the RF mod-
ule. The PCA contains a one time
programmable microprocessor that con-
trols all the ELT functions (ON/OFF,
modulation, 406 MHz digital message
and RESET).
All RF functions are contained in a
separate module. The transmitter oper-
ates simultaneously on 121.5 and
243.0 MHz with the carrier frequencies
remaining within 0.005% under all en-
vironmental operating conditions. Ap-
proximately every 50 seconds the
406.025 MHz transmitter transmits.
During this time the 121.5 and 243.0
MHz transmitter is momentarily turned
off.
1.2.1. 121.5/243.0 MHz TRANS-
MITTER
The AM modulation at 121.5 and
243.0 MHz is designated as A9 with
the carrier amplitude modulated with
an audio frequency sweeping down-
ward over a range of not less than
700 Hz, within the range of 1,600 to
300 Hz. The sweep repetition rate is
between 2 and 4 Hz with a modula-
tion factor of at least 0.85. The modu-
lation applied to the carrier frequency
has a minimum duty cycle of 33%
and a maximum duty cycle of 55%.
The ARTEX B406-4 ELT is de-
signed for a constant power output at
121.5 and 243.0 MHz that will not be
less than 23 dBm (200 mW) during
the 50 hour operational period at both
-20 degrees Centigrade and +55 de-
grees Centigrade.
1.2.2. 406.025 MHz TRANSMITTER
A digital information message is sent
to the satellite via the 406.025 MHz
transmitter. The modulation is phase
modulated and classified as 16K0G1D.
Every 47.5 to 52.5 seconds the 5
Watt transmitter is turned on for 440
mS (short message) or 520 mS (long
message)
The information sent to the satellite
is programmed at the factory and con-
tains a unique number that can be
used to identify the beacon.
1.3. FCC REQUIREMENTS
The ELT shall maintain a frequency
stability of 50 parts per million on
121.5 and 243.0 MHz. This allows a
variation of plus or minus 6.075 KHz
at 121.5 MHz.
On any frequency removed from the
assigned frequency by more than 50
percent up to and including 100 per-
cent of the authorized bandwidth the
power is to be attenuated at least 25
dB.
On any frequency removed from the
assigned frequency by more than 100
percent up to and including 250 per-
cent of authorized bandwidth the
power is to be attenuated at least 35
dB.
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On any frequency removed from the
assigned frequency by more than 250
percent of the authorized bandwidth
the power is to be attenuated at least
40 dB.
There are no equivalent FCC require-
ments for the 406.025 MHz frequency.
1.4. TSO REQUIREMENTS
To gain TSO approval of a 406.025
MHz ELT it is necessary to meet the
requirements of TSO C126. The fol-
lowing sections contain descriptions of
components necessary to meet TSO
C126 with the ARTEX B406-4 ELT.
1.4.1. ACTIVATION MONITOR
An aural and/or visual monitor is pro-
vided to alert the pilot when the ELT
has been activated and is transmitting.
The following requirements apply to
the activation monitors:
a. Aural Monitor - The aural monitor
provides a distinct signal enabling a
search and rescue team to locate an
aircraft with a transmitting ELT in a
confined area with a large number of
aircraft (i.e. such as an airport). The
search and rescue team would listen
for the aural monitor and easily locate
and disable the offending ELT without
a great deal of effort.
b. Visual Monitor - The visual moni-
tor is designed to be installed so that
it can be viewed from the pilot’s posi-
tion. Its intended function is to inform
the pilot that the ELT is transmitting,
avoiding a situation where an aircraft
is flying with its ELT transmitting.
1.4.2. G-SWITCH
The crash force activation sensor or
G-Switch is designed to activate with
a change of velocity of 4.5 fps +/-0.5
fps both under normal conditions and
while being subjected to 30 G’s of
cross axis forces. Figure 1-1 shows
the plot of time versus G Force that
the G-Switch must be qualified to in
order to meet ED-62 approval criteria.
The FAA has allowed the use of this
G-Switch under TSO C126.
1.4.3. BATTERY PACK
ARTEX holds C142 TSO approval for
the Lithium Battery Pack. As such, the
following paragraph is required by
TSO C142.
The conditions and tests required
for this TSO approval of this bat-
tery are minimum performance stan-
dards. It is the responsibility of
those desiring to install this battery
in a special class of aircraft to de-
termine that the aircraft installation
conditions are within the TSO stan-
dards. The battery may be installed
only if further evaluation by appli-
cant documents an acceptable in-
stallation and is approved by the
Administrator. Lithium battery safety
concerns include the possibility of
fire, venting violently, and venting
of toxic gases.
The Battery Pack for the B406-4
ELT consists of 4 “D” size Lithium
Manganese Dioxide cells connected in
series. In an effort to increase the
safety of the battery pack, a number
of features were designed into the
ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5004
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battery pack. To prevent the cells
from being charged, diodes are con-
nected across each cell and fuses are
connected to the output.
1.4.4. REMOTE CONTROL
The remote control (cockpit panel
switch) provides “MANUAL ON,”
“ARMED,” and “RESET” modes. The
remote control wiring between the con-
trol and the ELT is designed so that
no combination of short circuits be-
tween the remote control, monitor(s),
associated wiring and the airframe will:
·Inhibit the equipment from being auto-
matically activated.
·Deactivate the ELT after it has been ac-
tivated.
·Result in additional power drain so that
the ELT will not meet the minimum Peak
Effective Radiated Power ( PERP) of 17
dBm or Equivalent Isotropic Radiated
Power (EIRP) of 20 dBm through the 50
hour operation period at any of the
specified operating temperatures (-20°
C to +55° C).
1.5. ARTEX Dual Input An-
tennas
All of the ARTEX 406 dual element
antennas are designed to work with
any of the ARTEX Dual output 406
ELT’s including the B406-4.
1.5.1. Rod Antenna (Dual Input)
The 110-320 Rod Antenna (refer to
Figure 1-2) is intended for lower
speed aircraft that do not exceed 350
knots TAS.
110-320 SPECIFICATIONS
·Freq: 121.5, 243.0 & 406.025 MHz
·VSWR : 2.0:1 Max. for 121.5/243.0 MHz
1.5 Max. for 406.025 MHz
·Polarization: Vertical
·Radiation Pattern: Omnidirectional
·Airspeed Rating: 350 Knots TAS
·Connectors: BNC & TNC
1.5.2. Blade Antennas (Dual In-
put)
The 110-337 Blade Antenna (refer to
Figure 1-3) is the ARTEX antenna of
choice for use on aircraft that do not
exceed Mach 1.
110-337 SPECIFICATIONS
·Freq: 121.5, 243.0 & 406.025 MHz
·VSWR: 2.0:1 Max at 121.5/243.0 MHz
1.50:1 Max for 406.025 MHz
·Polarization: Vertical
·Radiation Pattern: Omnidirectional
·Airspeed Rating: 600 Knots TAS @
25,000 Feet (Mach 1).
·Connectors: BNC & TNC
The 110-333 Blade Antenna (refer to
Figure 1-4) is also intended for use
on aircraft that do not exceed Mach
1.
110-333 SPECIFICATIONS
·Freq: 121.5, 243.0 & 406.025 MHz
·VSWR: 2.0:1 Max for 121.5/243.0 MHz
1.50:1 Max for 406.025 MHz
·Polarization: Vertical
·Radiation Pattern: Omnidirectional
·Airspeed Rating: Mach 1.
·Connectors: BNC & TNC
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The 110-328-01 Blade Antenna (refer
to Figure 1-5) is intended for use by
OEMs who have previously designed
this antenna into their applications on
higher speed aircraft that do not ex-
ceed Mach 1.
110-328-01 SPECIFICATIONS
·Freq: 121.5, 243.0 & 406.025 MHz
·VSWR: 2.0:1 Max at 121/5/243.0 MHz,
1.50:1 Max for 406.025 MHz
·Polarization: Vertical
·Radiation Pattern: Omnidirectional
·Airspeed Rating: 600 Knots TAS @
35,000 Feet.
·Connectors: BNC & TNC
ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5004
02/26/08 PAGE 1-8

ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5004
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FIGURE 1-2 ROD ANT 110-320 FIGURE 1-3 BLADE ANT 110-337

ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5004
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FIGURE 1-4 BLADE ANT 110-333 FIGURE 1-5 BLADE ANT 110-328-01

ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5004
12/02/99 PAGE 2-1
B406-4 OPERATION