ARTEX ELT C406-N Instruction Manual

Page 1 of 88
ARTEX PRODUCTS / ACR ELECTRONICS, INC.
5757 Ravenswood Rd, Ft. Lauderdale, FL 33312
Phone [phone], Fax [phone]
www.acrartex.com
ARTEX ELT C406-N / ARTEX ELT C406-N HM
Emergency Locator Transmitter
Description, Operation, Installation and Maintenance Manual
570-5060 Rev. M

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 2 of 88
This manual includes data for the following equipment:
Component Part No. Model No.
Emergency Locator Transmitter 453-5060 C406-N
Emergency Locator Transmitter 453-5061 C406-N HM
PROPRIETARY INFORMATION
This document contains proprietary information and such information may not be disclosed to others for any
purpose, nor used for manufacturing purposes without written permission from ACR Electronics, Inc.
Information in this manual is subject to change without notice. ACR Electronics, Inc. makes no warranty,
expressed or implied, with regard to this manual, including but not limited to any implied warranties of
merchantability, fitness for a particular purpose, and non-infringement. In addition, ACR Electronics, Inc. makes
no warranty with regard to the documentation or data contained herein. ACR Electronics, Inc. is not liable in the
event of incidentals, special, consequential, or any other damages in connection with or arising from furnishing,
performance, or use of this manual.
Reproduction of this publication or any portion thereof by any means is prohibited. For further information
contact Sales, ACR Electronics Inc., 5757 Ravenswood Rd, Fort Lauderdale, FL 33312. Telephone (954)
981-3333.
AIRWORTHINESS LIMITATIONS
The Airworthiness limitations section is FAA approved and specifies inspections and other maintenance required
under 14 CFR§ 43.16 and 91.403, unless an alternative program has been approved.
IMPORTANT NOTICE
ACR Electronics, Inc. will be responsible for full distribution and revisions of ICA’s (Instructions for Continued
Airworthiness). For inquiries regarding the content and currency of this manual, contact ACR Electronics Inc.,
5757 Ravenswood Rd, Fort Lauderdale, FL 33312. Telephone [phone].

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 3 of 88
TABLE OF CONTENTS
TABLE OF CONTENTS ...............................................................................................................................3
LIST OF ACRONYMS, ABBREVIATIONS AND DEFINITIONS ..........................................................................7
LIST OF FIGURES .....................................................................................................................................9
RECORD OF REVISIONS ..........................................................................................................................11
SERVICE BULLETIN LIST .........................................................................................................................12
INTRODUCTION .....................................................................................................................................13
1. Manual Usage ..............................................................................................................................13
A. General ...............................................................................................................................13
B. Application .......................................................................................................................... 13
2. Model Descriptions .......................................................................................................................13
A. C406-N................................................................................................................................ 13
B. C406-N HM..........................................................................................................................14
3. Approvals ....................................................................................................................................14
A. C406-N and C406-N HM .......................................................................................................14
B. Battery ................................................................................................................................ 14
C. RTCA DO-160D Compliance ..................................................................................................15
4. Frequency Allocations...................................................................................................................16
A. Application .......................................................................................................................... 16
B. Discussion ........................................................................................................................... 16
5. References ..................................................................................................................................16
A. Regulatory Documents .........................................................................................................16
B. Other Documents.................................................................................................................17
DESCRIPTION AND OPERATION ..............................................................................................................18
1. Description ..................................................................................................................................18
A. Functional Overview ............................................................................................................. 18
B. Components ........................................................................................................................19
2. Operation ....................................................................................................................................22
A. Operational Overview ...........................................................................................................22
B. Normal Operation ................................................................................................................23
C. Manual Activation................................................................................................................. 23
D. ELT Reset............................................................................................................................ 23
E. Functional Check..................................................................................................................23
3. Specifications...............................................................................................................................24
A. Environmental and Physical ..................................................................................................24
B. Electrical ............................................................................................................................. 25
C. Antennas.............................................................................................................................26
TEST AND FAULT ISOLATION .................................................................................................................. 27
1. Inspection and Test Regulatory Requirements ...............................................................................27
A. United States .......................................................................................................................27
B. Canada................................................................................................................................27

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 4 of 88
C. Other Countries ...................................................................................................................27
2. Inspection and Test Procedures ....................................................................................................28
A. Checklist.............................................................................................................................. 28
B. Preparation..........................................................................................................................28
C. Coax Cable and Wiring Connections Inspection –Item 1 ........................................................29
D. ELT Mounting Tray and Hardware Inspection –Item 2 ........................................................... 29
E. Battery Pack Inspection –Item 3 ..........................................................................................29
F. G-Switch Functional Check –Item 4...................................................................................... 29
G. Performance Testing Setup................................................................................................... 30
H. 121.5 MHz Frequency Measurement –Item 5a ......................................................................31
I. Audio Modulation Check –Item 5b........................................................................................ 31
J. 121.5/243.0 MHz Power Output Measurement –Item 5c........................................................31
K. 406 MHz Frequency Measurement –Item 5d .........................................................................31
L. 406 MHz Power Output Measurement –Item 5e ....................................................................31
M. Current Draw Test –Item 5f.................................................................................................32
N. Digital Message Verification –Item 5g...................................................................................33
O. ELT Reset Check –Item 5h ..................................................................................................34
P. Installed Transmitter Test –Item 6 .......................................................................................34
Q. Antenna Test –Item 7 .........................................................................................................35
R. Inspection and Test Documentation –Item 8 ........................................................................35
3. Fault Isolation..............................................................................................................................36
A. Self-Test Error Troubleshooting Guidelines ............................................................................36
B. ELT Troubleshooting Guidelines ............................................................................................38
REMOVAL ............................................................................................................................................... 39
1. ELT .............................................................................................................................................39
A. ELT Removal ....................................................................................................................... 39
2. Battery ........................................................................................................................................40
A. Battery Pack Removal ..........................................................................................................40
3. Material or Equipment Return .......................................................................................................41
A. Shipment Information .......................................................................................................... 41
B. Return Material Authorization................................................................................................41
INSTALLATION ....................................................................................................................................... 42
1. Regulatory Requirements and Guidelines.......................................................................................42
A. For US Registered aircraft: ...................................................................................................42
B. TSO C126, Paragraph D ....................................................................................................... 42
C. FAA.....................................................................................................................................42
D. Canada................................................................................................................................43
E. Other Countries ...................................................................................................................43
F. RTCA...................................................................................................................................43
2. Mounting Tray .............................................................................................................................44
A. Location .............................................................................................................................. 44
B. Installation .......................................................................................................................... 46
3. Antenna ......................................................................................................................................47
A. Selection .............................................................................................................................47
B. Location .............................................................................................................................. 47
C. Installation .......................................................................................................................... 47
4. Remote Switch.............................................................................................................................50
A. Location .............................................................................................................................. 50
B. Installation .......................................................................................................................... 50

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 5 of 88
5. Buzzer.........................................................................................................................................51
A. Location .............................................................................................................................. 51
B. Installation .......................................................................................................................... 51
6. Wiring .........................................................................................................................................52
A. General Considerations and Recommendations ......................................................................52
B. Remote Switch Harness Fabrication....................................................................................... 52
C. ELT 22-Pin Plug Installation .................................................................................................. 56
D. Cockpit Remote Switch 9-Pin Plug Installation........................................................................ 57
E. Wiring Installation................................................................................................................58
F. Antenna Connection ............................................................................................................. 58
G. Cockpit Remote Switch Power Connection .............................................................................58
H. ELT Power Connection..........................................................................................................58
I. Airframe Ground Connections ............................................................................................... 58
J. Buzzer Connection ............................................................................................................... 59
K. Remote Switch Final Installation ........................................................................................... 59
7. ELT Installation and Test ..............................................................................................................60
A. Installation .......................................................................................................................... 60
B. Post-Installation Testing .......................................................................................................61
C. Installation Documentation ................................................................................................... 61
8. Battery Pack Installation...............................................................................................................62
A. Battery Reinstallation ...........................................................................................................62
B. New Battery Installation .......................................................................................................63
9. Helicopter Installations - Special Considerations.............................................................................64
A. Background .........................................................................................................................64
B. Recommendations................................................................................................................64
C. Orientation .......................................................................................................................... 65
APPENDIX A –ELT REGISTRATION..........................................................................................................66
1. Background Information ...............................................................................................................66
A. Hex ID Code ........................................................................................................................66
B. Reason for Registration ........................................................................................................ 66
C. Registration Information Resources.......................................................................................66
2. Registration .................................................................................................................................67
A. Responsibility.......................................................................................................................67
B. Required Information ...........................................................................................................67
C. Where to Register ................................................................................................................67
APPENDIX B –PROGRAMMING ADAPTER OPTION .................................................................................... 68
1. Description and Operation ............................................................................................................68
A. Purpose............................................................................................................................... 68
B. Physical Description ............................................................................................................. 68
C. PA Programming ..................................................................................................................68
D. Operation ............................................................................................................................ 69
2. Installation and Test ....................................................................................................................69
A. Wiring .................................................................................................................................69
B. Assembly.............................................................................................................................70
C. Installation .......................................................................................................................... 71
D. Aircraft ID Verification Test................................................................................................... 71
APPENDIX C –REMOTE SWITCH CONTROL PANEL OPTION ......................................................................72
1. Description and Operation ............................................................................................................72

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 6 of 88
A. Purpose............................................................................................................................... 72
B. Control Panel Description......................................................................................................72
C. Modified Buzzer Description ..................................................................................................73
D. Operation ............................................................................................................................ 73
2. Remote Switch Control Panel Installation.......................................................................................73
A. Location .............................................................................................................................. 73
B. Installation .......................................................................................................................... 73
3. Modified Buzzer Installation ..........................................................................................................74
A. Location .............................................................................................................................. 74
B. Installation .......................................................................................................................... 74
4. Wiring and Test ...........................................................................................................................75
A. Remote Switch Control Panel Wiring Fabrication .................................................................... 75
B. Modified Buzzer Wiring Fabrication........................................................................................77
C. Remote Switch Control Panel Wiring Installation ....................................................................77
D. Modified Buzzer Wiring Installation........................................................................................ 78
E. Standard Buzzer Installation .................................................................................................78
F. Remote Switch Control Panel Final Installation.......................................................................78
G. Remote Switch Control Panel Functional Test.........................................................................80
ILLUSTRATED PARTS LIST ...................................................................................................................... 81
1. Introduction.................................................................................................................................81
A. Purpose............................................................................................................................... 81
B. IPL Usage Guide ..................................................................................................................81
2. Manufacturer Name and Address ..................................................................................................81
A. Ordering Information ...........................................................................................................81
3. Explanation of Detailed Parts List Entries .......................................................................................81
A. Fig # & Item Column ........................................................................................................... 81
B. Part # Column ..................................................................................................................... 81
C. Nomenclature Column ..........................................................................................................81
D. UPA (Units Per Assembly) Column.........................................................................................83
4. Detailed Parts List ........................................................................................................................84

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 7 of 88
LIST OF ACRONYMS, ABBREVIATIONS AND DEFINITIONS
Term Definition
AC Advisory Circular –A Federal Aviation Administration (USA) bulletin with special
information. For the purposes of this document, the acronym AC does not refer to
electrical alternating current.
AWG American Wire Gauge –An electrical wire diameter standard. Look for this
acronym in front of or following a wire size number.
BNC Connector A very common type of coax cable connector having a 50 impedance and used
for RF signal connections.
CAR Canadian Aviation Regulations –The rules and regulations governing the
manufacture, certification, operation, maintenance, and alteration of aircraft in
Canada.
CFR Code of Federal Regulations –The general and permanent rules published in the
Federal Register by the executive departments and agencies of the Federal
Government. Title 14, “Aeronautics and Space” contains the FARs.
Container The term “Container”, within the context of this document, refers to a device
designed to suppress RF signals, such that the broadcast of an ELT placed in the
container cannot reach the SAR satellite system.
COSPAS-SARSAT The international search and rescue consortium that governs the international
satellite-based search and rescue distress alert detection and information
distribution system. For a complete description go to the official web site for the
International COSPAS-SARSAT Program.
DER Designated Engineering Representative –An individual qualified and designated
by the FAA to approve, or recommend approval, of technical data to the FAA.
Drip Loop Extra wire length used to form a U-shaped bend in a wire or cable. Water or other
fluids will flow down to the bottom of the loop and drip off. Electrical connections
are made at the top of the loop.
ELT Emergency Locator Transmitter –ELTs are installed on aircraft and used to send
emergency signals to the SAR satellite system. The word “Beacon” is associated
with these devices.
EMI Electromagnetic Interference –An undesirable disturbance that affects an
electrical circuit due to either electromagnetic conduction or electromagnetic
radiation emitted from an external source. Also called radio frequency interference
or RFI.
Eurocae European Organization for Civil Aviation Equipment –EUROCAE documents are
widely referenced as a means of compliance to European Technical Standard
Orders (ETSOs) and other regulatory documents.
FAA Federal Aviation Administration –The United States government agency for
aircraft safety and regulation.
FAR Federal Aviation Regulations –The rules and regulations governing the
manufacture, certification, operation, maintenance, repair, and alteration of
aircraft in the United States.
Form 337 FAA Form 337 is required anytime a major repair and/or major alteration is
performed on an aircraft. Refer to FAR, Part 43, Appendix A and the definitions of
Major Repair/Alteration contained in FAR, Part 1 for guidance.

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 8 of 88
FSDO Flight Standards District Office –FAA district offices responsible for aircraft
certification, operation, maintenance, and modification issues, approvals and
enforcement.
G-Switch A velocity switch that detects sudden de-acceleration and is used to automatically
activate an ELT. May also be referred to as a “crash sensor”.
LED Light Emitting Diode –Semiconductor device that emits light when current is
passed through it. Usually used as a status or warning indicator.
MIL The three-letter acronym that stands for “Military” and proceeds military
specifications and standards numbers (e.g., MIL-W-xxxx would indicate a wire
specification and MIL-STD-xxxx would indicate a standard).
PA Programming Adapter –An optional device that automatically updates the
programming of an ELT when it is moved from one aircraft to another.
P/N Part Number –Refers to an ACR Electronics part number, unless otherwise noted.
Part numbers are also indicated with parentheses (e.g., xxx-xxxx)
Plug The term “Plug”, within the context of this document, refers to the male half of an
electrical connector.
RF Radio Frequency –The range of electromagnetic radiation that constitutes the
radio spectrum and corresponds to the frequency of alternating current electrical
signals used to produce and detect radio waves.
RTCA Radio Technical Commission for Aeronautics –Organization that makes
recommendations for airworthiness. Refer to http://www.rtca.org/aboutrtca.asp
for more information.
RTV A rubbery silicon-based adhesive typically used to prevent vibration problems and
water intrusion.
SAR Search and Rescue
Screen Room The term “Screen Room”, within the context of this document, refers to a room
designed to suppress RF signals, such that the broadcast of an ELT placed in the
screen room cannot reach the SAR satellite system.
Service Loop A length of wire or cable, at the connection point, of sufficient length to allow a
component to be withdrawn from its mounting position and disconnected from its
associated wiring.
Tether A tether is a cord or similar device that anchors something movable to a stationary
point or anchors two items together, such that they cannot become separated
beyond the length of the tether.
TSO Technical Standard Order –A TSO is a minimum performance standard issued by
the FAA for specified materials, parts, processes, and appliances used on civil
aircraft.
UTC Coordinated Universal Time –A time standard based on International Atomic
Time. UTC is the time system used in aviation and is often associated with
Greenwich Mean Time (GMT) and/or “Zulu” time.
VHF Very High Frequency –The 30 MHz to 300 MHz radio frequency band.
VSWR Voltage Standing Wave Ratio –Electrical signals will “echo” back on a wire if load
impedance is not matched to the impedance of the wire. VSWR is a measurement
of the amount of voltage being “echoed,” compared to the original signal.

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 9 of 88
LIST OF FIGURES
Figure 1 ELT Orthogonal Axes...........................................................................................................14
Figure 2 C406-N Series ELT and Mounting Frame Assembly ................................................................ 19
Figure 3 Cockpit Remote Switch........................................................................................................20
Figure 4 Buzzer................................................................................................................................20
Figure 5 Battery Pack Assembly ........................................................................................................ 21
Figure 6 Rod and Whip Antennas ......................................................................................................21
Figure 7 Blade Antennas...................................................................................................................21
Figure 8 ELT Operational Flow Diagram.............................................................................................22
Figure 9 Performance Tests Equipment Setup.................................................................................... 30
Figure 10 Current Draw Test Setup ................................................................................................... 32
Figure 11 Long 406 MHz Message Example .......................................................................................33
Figure 12 ELT Removal Sequence .....................................................................................................39
Figure 13 Battery Pack Removal........................................................................................................ 40
Figure 14 C406-N Series ELT Outline and Dimensions ........................................................................ 44
Figure 15 Typical Mounting Tray Installation......................................................................................46
Figure 16 Rod Antenna 110-338 and Whip Antenna 110-343 Outlines and Dimensions......................... 48
Figure 17 Blade Antennas 110-340 and 110-341 Outlines and Dimensions...........................................49
Figure 18 Remote Switch Outline and Dimensions..............................................................................50
Figure 19 Buzzer Outline and Dimensions ..........................................................................................51
Figure 20 Remote Switch Harness Arrangement.................................................................................53
Figure 21 Remote Switch Harness Wiring Diagram .............................................................................54
Figure 22 Harness ELT 22-Pin Plug Arrangement ...............................................................................56
Figure 23 ELT Installation Sequence..................................................................................................60
Figure 24 Battery Pack Installation .................................................................................................... 62
Figure 25 Battery Pack Screw Tightening Pattern ...............................................................................63
Figure 26 ELT Orthogonal Axes......................................................................................................... 64
Figure 27 Orientation of ELT for Helicopter Installations .....................................................................65
Figure 28 Programming Adapter ....................................................................................................... 68
Figure 29 Programming Adapter Interface Wiring Diagram .................................................................70
Figure 30 Programming Adapter Installation ......................................................................................71
Figure 31 Remote Switch Control Panel Assembly ..............................................................................72
Figure 32 Cockpit Remote Switch Panel Outline and Dimensions .........................................................73
Figure 33 Modified Buzzer Outline and Dimensions.............................................................................74
Figure 34 Remote Switch Control Panel Wiring Diagram (130-4005 Modified Buzzer) ...........................76
Figure 35 Remote Switch Control Panel Wiring Diagram (130-4004 Buzzer) .........................................79
Figure 36 C406-N Series ELT Main Assembly and Installation..............................................................84

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 10 of 88
Figure 37 Electrical Components .......................................................................................................86
Figure 38 Antennas .......................................................................................................................... 88

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 11 of 88
RECORD OF REVISIONS
REVISION
CHANGE
DATE
REVISION
CHANGE
DATE
-
RELEASE
May 12/2003
A
DCN 2227
Jul 11/2003
A
DCN 2273
Sep 08/2003
B
DCN 2380
Mar 22/2004
C
DCN 2444
Aug 05/2004
C
DCN 2730
Mar 09/2006
C
DCN 2870
Oct 05/2006
D
DCN 2961
Mar 13/2007
D
DCN 2968
Mar 20/2007
E
DCA W9414
Apr 06/2010
F
ECO 14756
Jul 28/2011
G
ECO 15149
Jul 31/2012
H
ECO 15329
Mar 1/2013
J
ECO 15726
Aug 13/2014
K
ECO 15830
Dec 01/2014
L
ECO 16813
Jan 22/2018
M
ECO 16838
Jan 25/2018

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 12 of 88
SERVICE BULLETIN LIST
SERVICE
BULLETIN NO
ISSUE
DATE
SUBJECT
MANUAL
REV NO
MANUAL
REV DATE

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 13 of 88
INTRODUCTION
1. Manual Usage
A. General
1) This manual describes the operation, installation, and maintenance of the Model C406-N Series
emergency locator transmitter (ELT). The information is provided to ensure initial and continued
airworthiness. Information presented in this manual is accurate at the time of printing, but is subject to
change. Refer to the Artex products web site at www.acrartex.com for the latest information and any
updates to this manual.
2) Information on COSPAS-SARSAT emergency locator beacon registration requirements and procedures is
provided in Appendix A –ELT Registration on page 66.
3) Web links provided in this manual were accurate at time of printing but may be subject to change.
4) ACR Electronics, Inc. reserves the right to add approved components to the ELT system; including, but
not limited to antennas, remote switches, and coaxial cables.
5) Regulatory references contained herein are generally confined to United States and Canadian
requirements and, in any case, should not be considered all encompassing. Consult your national
aviation authority for applicable requirements.
B. Application
1) This manual constitutes supporting data/documentation for the C406-N Series ELT, including:
a) Description and Operation
b) Test and Fault Isolation (includes inspection criteria)
c) Removal
d) Installation
e) Registration
f) Illustrated Parts List
2) In the United States, the C406-N Series ELT must be installed and maintained in accordance with the
requirements herein and 14 CFR, FAR Parts 43, and 91; and other airworthiness requirements, as
applicable.
3) In Canada, the C406-N Series ELT must be installed and maintained in accordance with the
requirements herein and Canadian Aviation Regulations (CAR), Part V, Paragraph 551.104 and other
CAR airworthiness requirements, as applicable.
4) C406-N Series ELT installation and maintenance in all other countries must comply with the
requirements herein and applicable national airworthiness requirements.
5) The accessories (i.e., remote switch and antennas) addressed in this manual are the accessories most
commonly associated with the C406-N Series ELT. Other options, such as a different remote switch
configuration, should be installed and maintained in accordance with the written instructions specific to
the accessory.
NOTE: Contact ACR Electronics, Inc. for optional accessories approved for use with a C406-N Series ELT.
6) To ensure proper operation, only parts listed in the Illustrated Parts List of this manual or those
recommended by ACR Electronics may be used as replacement parts for the C406-N Series ELT.
2. Model Descriptions
A. C406-N
1) The C406-N is a type AF (Automatic Fixed) ELT, which transmits on 121.5, 243.0, and 406 MHz.

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 14 of 88
2) The ELT is enclosed within a multi-piece mounting frame consisting of a mounting tray, protective top
cover and mounting frame cap.
3) When ordered as a system, an installation kit, cockpit remote switch, coax cable, audible buzzer, and
single input antenna are provided.
B. C406-N HM
1) The C406-N HM ELT was developed for helicopter installations and features an additional 5-axis
G-Switch module, which allows the ELT to be activated in any of the six orthogonal axes. See Figure 1
ELT Orthogonal Axes.
2) The C406-N HM ELT is identical to the C406-N ELT in all other aspects.
Figure 1 ELT Orthogonal Axes
3. Approvals
A. C406-N and C406-N HM
1) FAA TSO C126, Type AF
a) The conditions and tests required for TSO approval of this article are minimum performance
standards. It is the responsibility of those installing this article either on or within a specific type or
class of aircraft to determine that the aircraft installation conditions are within TSO standards. TSO
articles must have separate approval for installation in an aircraft. The article may be installed only
if performed under 14 CFR Part 43 or the applicable airworthiness requirements.
2) Transport Canada - Type Certificate Data Sheet AP-56
3) Industry Canada - Certification Number 1215B-C406N AF
4) ETSO-2C126
5) COSPAS-SARSAT - Certificate No. 135
B. Battery
CAUTION: LITHIUM BATTERY SAFETY CONCERNS INCLUDE THE POSSIBILITY OF
FIRE, VENTING VIOLENTLY, AND VENTING OF TOXIC GASES.
1) The lithium battery pack used on the C406-N Series ELT is certified under TSO C142.
a) The conditions and tests required for TSO approval of this battery are minimum performance
standards. It is the responsibility of those desiring to install this battery in a specific type or class of
aircraft to determine that the aircraft installation conditions are within the TSO standards. The
battery may be installed only if further evaluation by applicant documents an acceptable installation
and is approved by the Administrator.

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 15 of 88
C. RTCA DO-160D Compliance
1) DO-160D Environmental Categories: [D1]XBC[B204][204]XRXXXXXZAZZ[204]H[XXXX]XXX
2) The DO-160D environmental categories breakdown is detailed in Table 1.
CATEGORY
SECTION
DESCRIPTION
D1
4.0
Temperature/Altitude
X
4.5.4
In-Flight Loss of Cooling
B
5.0
Temperature Variation
C
6.0
Humidity
B204
7.0
Operational Shock and Crash Safety
204
8.0
Vibration
X
9.0
Explosion
R
10.0
Waterproofness
X
11.0
Fluids Susceptibility
X
12.0
Sand and Dust
X
13.0
Fungus
X
14.0
Salt Spray
X
15.0
Magnetic Effect
Z
16.0
Power Input
A
17.0
Voltage Spike
Z
18.0
Audio Frequency Susceptibility
Z
19.0
Induced Signal Susceptibility
204
20.0
Radio Frequency Susceptibility
H
21.0
Emission of RF Energy
XXXX
22.0
Lightning
X
23.0
Lightning Direct Effects
X
24.0
Icing
X
25.0
Electrostatic Discharge
Table 1 Environmental Categories Breakdown

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 16 of 88
4. Frequency Allocations
A. Application
1) This section addresses the 406.0-406.1 MHz transmitter window and the specific frequency band
allocations residing above 406.028 MHz, which are assigned or reserved within the 406.0-406.1 MHz
distress frequency window.
B. Discussion
1) The 406 MHz transmitter frequency of the C406-N Series ELT was originally 406.028 MHz. In order to
comply with COSPAS-SARSAT frequency allocation requirements, changes to the 406 MHz frequency
may occur since the original release of this product.
2) While the original C406-N Series ELTs covered by this manual transmit on 406.028 MHz, current C406-N
Series ELTs may not. The product identification label on each ELT specifies the transmitting frequencies
of the individual ELT. The 406 MHz component may be 406.028, 406.037 MHz, etc. Allocation of
frequencies, based on beacon population per specified frequency band, is controlled by
COSPAS-SARSAT.
3) The frequency references throughout this manual for the 406 MHz component should be considered the
baseline and the specific frequency indicated on the ELT product label should be substituted if it differs
from 406.028 MHz.
5. References
A. Regulatory Documents
1) The following regulatory documents are referred to herein. When referring to such documents, it is the
manual user’s responsibility to ensure they are using the latest revision or release of such documents. To
that end, the revision designator of specific document numbers has not been included, with the
exception of the RTCA document listing, which reflects the revision level of the documents at the time
of TSO testing and certification.
2) Except in the case of a printed manual, reference documents available online or source locations are
linked to applicable web sites.
3) United States
a) AC 20-130, “Airworthiness Approval of Navigation or Flight Management Systems Integrating
Multiple Navigation Sensors”
b) AC 20-138, “Airworthiness Approval of Global Navigation Satellite System (GNSS) Equipment”
c) AC 43-9, “Maintenance Records”
d) AC 43-210, “Standardized Procedures for Requesting Field Approval of Data, Major Alterations, and
Repairs”
e) AC 43.9-1, “Instructions for Completion of FAA Form 337”
f) AC 43-13-1, “Acceptable Methods, Techniques, and Practices –Aircraft Inspection and Repair”
g) AC 43.13-2, “Acceptable Methods, Techniques, and Practices - Aircraft Alterations”
h) FAR, Part 43, “Maintenance, Preventive Maintenance, Rebuilding, and Alteration”
i) FAR, Part 91, “General Operating and Flight Rules”
4) Canada
a) CAR, Part V, “Airworthiness”
b) CAR, Part VI, “General Operating and Flight Rules”
5) COSPAS-SARSAT
a) C/S G.005, “Cospas-Sarsat Guidelines on 406 MHz Beacon Coding, Registration and Type Approval”
b) C/S S.007, “Handbook of Beacon Regulations”
6) RTCA –The following documents are available for purchase at RTCA’s web site www.rtca.org or by mail:
a) DO-160D, “Environmental Conditions and Test Procedures for Airborne Equipment”

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 17 of 88
b) DO-178B, “Software Considerations in Airborne Systems and Equipment Certification”
c) DO-182, “Emergency Locator Transmitter (ELT) Equipment Installation and Performance”
d) DO-183, “Minimal Operational Performance Standards for Emergency Locator Transmitters -
Automatic Fixed-ELT (AF), Automatic Portable-ELT (AP), Automatic Deployable-ELT (AD),
Survival-ELT (S) Operating on 121.5 and 243.0 MHz”
e) DO-204, “Minimal Operational Performance Standards for 406 MHz Emergency Locator
Transmitters (ELT)”
B. Other Documents
1) The following documents are available online at the Artex products web site at www.acrartex.com or
from ACR Electronics upon request.
a) Document number 570-1000, “ELT Test Set Operations Manual”
b) Document number 570-2000, “453-2000 Handheld Programmer Operations Manual”
c) Document number Y1-03-0272, “A3-06-2824 Handheld Programmer Operations Manual”
d) Document number Y1-03-0273, “A3-06-2825 ELT Test Set Operations Manual”

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 18 of 88
DESCRIPTION AND OPERATION
1. Description
A. Functional Overview
1) The ELT automatically activates during a crash and transmits the standard sweep tone on 121.5 and
243.0 MHz. Approximately every 50 seconds, for up to 520 milliseconds (long message protocol); the
406 MHz transmitter turns on. During that time, an encoded digital message is sent to the
COSPAS-SARSAT Search and Rescue (SAR) satellite system.
2) The information contained in the message includes:
a) Serial number assigned to the ELT by the beacon manufacturer or the national beacon registration
authority.
b) Aircraft identification (24-bit address) or registration number
NOTE: When the optional C406-N Programming Adapter (PA) is installed, ELTs can be moved
between aircraft and the PA reprograms the ELT with either the aircraft 24-bit address
or registration number. See Appendix B –Programming Adapter Option.
c) Country of registration and country code
d) Position coordinates provided by the aircraft navigation system
NOTE: The C406-N Series ELT supports ARINC 429 data bus formats for receiving position data
from the aircraft navigation system. Other formats, such as RS-232, RS-422, etc., are
not supported.
3) The 406 MHz transmitter will operate for 24 hours and then shuts down automatically. The 121.5/243.0
transmitter will continue to operate until the batteries are exhausted, which is typically at least 50 hours.
4) The 406 MHz transmitter produces a much more accurate position, typically 3 kilometers as compared
with 15 to 20 kilometers for 121.5/243.0 MHz transmitters. When coupled to the aircraft navigation
system, the accuracy improves to approximately 100 meters.
5) The ELT transmits a digital message that allows search and rescue authorities to contact the
owner/operator of the aircraft through information contained in a database. Information contained in
the database includes:
a) Type of aircraft and aircraft registration number
b) Owner address and telephone number
c) Alternate emergency contact
6) After the ELT is activated and the 406 MHz signal is detected by the SAR satellite system and a position
is calculated, the 121.5/243.0 MHz transmissions are used to home in on the crash site.
NOTE: Effective February 1, 2009, COSPAS-SARSAT has terminated the satellite processing of
distress signals from 121.5 and 243.0 MHz beacons.
7) Aircraft communications transceivers are not capable of receiving 406 MHz transmissions; therefore, the
only methods of monitoring the ELT are:
a) The blinking cockpit remote switch LED

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 19 of 88
b) The buzzer,
c) 121.5/243.0 MHz transmissions, which can be monitored using the aircraft communications
transceiver or an AM radio tuned to 121.5 MHz.
B. Components
1) The C406-N Series ELT main assembly is housed in a high impact, fire resistant, polycarbonate plastic
case, which is enclosed in a protective mounting frame assembly made of similar material. See Figure 2
C406-N Series ELT and Mounting Frame Assembly.
NOTE: The ELT main assembly and its mounting frame assembly are capable of withstanding
extremely harsh environments and have been subjected to the rigorous environmental
testing required by COSPAS-SARSAT for certification.
Figure 2 C406-N Series ELT and Mounting Frame Assembly

ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N / C406-N HM
Page 20 of 88
2) The cockpit-mounted remote switch assembly is comprised of an ELT status LED and control switch,
which allows an operator to monitor ELT status and manually turn on the ELT (i.e., activating) for testing
and resetting (i.e., deactivating) the ELT. See Figure 3 Cockpit Remote Switch.
NOTE: The ELT CANNOT be disarmed or disabled from the cockpit. Cockpit operation is limited
to deactivating or manually activating the ELT.
Figure 3 Cockpit Remote Switch
3) The buzzer (i.e., horn) provides an audible alert when the ELT is active. See Figure 4 Buzzer.
Figure 4 Buzzer
4) The battery pack for the C406-N Series ELT consists of four “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 battery pack. To prevent the cells from being charged, diodes are connected across
each cell and fuses are connected to the output. See Figure 5 Battery Pack Assembly.