ARTEX ME406 Instruction Manual

Page 1 of 72
Mar 19/2015
570-1600 Rev. V
Initial Issue JUN 30/2005
ARTEX PRODUCTS / ACR ELECTRONICS, INC.
5757 Ravenswood Rd, Ft. Lauderdale, FL 33312
Cage Code: 18560
25-62-30
ME406 Series
Emergency Locator Transmitter
Description, Operation, Installation and Maintenance Manual
This manual includes data for the equipment that follows:
Component Part No. Model No.
Emergency Locator Transmitter 453-6603 ME406
Emergency Locator Transmitter 453-6604 ME406HM

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ME406 (453-6603), ME406HM (453-6604)
Page 2 of 72
Mar 19/15
25-62-30
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.
Information in this manual is subject to change without notice. ACR Electronics 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 makes no warranty with
regard to the documentation or data contained herein. ACR Electronics 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, 5757 Ravenswood Rd, Fort Lauderdale, FL 33312. Telephone [phone].
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 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, 5757
Ravenswood Rd, Fort Lauderdale, FL 33312. Telephone [phone].

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ME406 (453-6603), ME406HM (453-6604)
Page 3 of 72
Mar 19/15
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RECORD OF REVISIONS
REVISION
CHANGE
DATE
REVISION
CHANGE
DATE
- RELEASE Jun 30/2005
A
DCN 2670
Nov 17/2005
B DCN 2777 May 01/2006
C DCN 2847 Aug 21/2006
D DCN 3007 May 21/2007
E DCN 3076 Sep 27/2007
F
DCN 3182
Mar 03/2008
G DCN 3227 May 19/2008
G DCN 3413 Mar 30/2009
H DCN 3571 Jan 12/2010
J DCA W9414 Apr 06/2010
K
ECO 14756
Jul 26/2011
L ECO 14850 Mar 09/2012
M ECO 15380 May 3/2013
N ECO 15420 Jun 25/2013
P ECO 15452 Aug 20/2013
R
ECO 15493
Oct 03/2013
U ECO 15830 Dec 01/2014
V ECO 15931 Mar 19/2015

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ME406 (453-6603), ME406HM (453-6604)
Page 4 of 72
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SERVICE BULLETIN LIST
SERVICE
BULLETIN NO
ISSUE
DATE
SUBJECT
MANUAL
REV NO
MANUAL
REV DATE

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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ME406 (453-6603), ME406HM (453-6604)
Page 5 of 72
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LIST OF EFFECTIVE PAGES
SUBJECT
PAGE
DATE
SUBJECT
PAGE
DATE
Title Page
1
Aug 20/13
Test and Fault Isolation (cont.)
38
Oct 03/13
Notices 2 Aug 20/13 39 Oct 03/13
Record of Revisions 3 Aug 20/13 Removal 40 Oct 03/13
Service Bulletin List 4 Aug 20/13 41 Oct 03/13
List of Effective Pages 5 Mar 19/15 Installation 42 Mar 19/15
Table of Contents 6 Aug 20/13 43 Mar 19/15
7
Dec 01/14
44
Oct 03/13
8
Dec 01/14
45 Oct 03/13
List of Figures 9 Aug 20/13 46 Oct 03/13
Introduction 10 Aug 20/13 47 Oct 03/13
11 Aug 20/13 48 Oct 03/13
12 Aug 20/13 49 Oct 03/13
13 Aug 20/13 50 Oct 03/13
14
Aug 20/13
51
Oct 03/13
15 Aug 20/13 52 Oct 03/13
16 Aug 20/13 53 Oct 03/13
17 Aug 20/13 54 Oct 03/13
Description and Operation 18 Aug 20/13 55 Oct 03/13
19 Aug 20/13 56 Oct 03/13
20
Aug 20/13
57
Oct 03/13
21
Aug 20/13
58
Oct 03/13
22 Aug 20/13 59 Mar 19/15
23 Aug 20/13 60 Oct 03/13
24 Aug 20/13 61 Oct 03/13
25 Aug 20/13 62 Oct 03/13
Test and Fault Isolation 26 Aug 20/13 63 Oct 03/13
27
Aug 20/13
64
Oct 03/13
28 Oct 03/13 65 Oct 03/13
29 Oct 03/13 Appendix A 66 Oct 03/13
30 Oct 03/13 67 Oct 03/13
31 Oct 03/13 Illustrated Parts List 68 Oct 03/13
32 Oct 03/13 69 Oct 03/13
33 Oct 03/13 70 Oct 03/13
34
Oct 03/13
71
Oct 03/13
35 Oct 03/13 72 Oct 03/13
36 Oct 03/13 73 Oct 03/13
37 Oct 03/13

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ME406 (453-6603), ME406HM (453-6604)
Page 6 of 72
Mar 19/15
25-62-30
TABLE OF CONTENTS
RECORD OF REVISIONS ............................................................................................................................3
SERVICE BULLETIN LIST ...........................................................................................................................4
LIST OF EFFECTIVE PAGES........................................................................................................................5
TABLE OF CONTENTS ...............................................................................................................................6
LIST OF FIGURES .....................................................................................................................................9
INTRODUCTION .....................................................................................................................................10
1. Manual Usage..............................................................................................................................10
A. General ...............................................................................................................................10
B. Application ..........................................................................................................................10
2. Model Descriptions.......................................................................................................................11
A. ME406.................................................................................................................................11
B. ME406HM............................................................................................................................11
3. Approvals ....................................................................................................................................12
A. ME406 and ME406HM ..........................................................................................................12
B. Battery ................................................................................................................................12
C. RTCA DO-160D Compliance ..................................................................................................12
4. Frequency Allocations...................................................................................................................14
A. Application ..........................................................................................................................14
B. Discussion ...........................................................................................................................14
5. List of Acronyms, Abbreviations, and Definitions ............................................................................15
6. References ..................................................................................................................................17
A. Regulatory Documents .........................................................................................................17
B. Other Documents.................................................................................................................17
DESCRIPTION AND OPERATION ..............................................................................................................18
1. Description ..................................................................................................................................18
A. Functional Overview.............................................................................................................18
B. Components ........................................................................................................................19
2. Operation ....................................................................................................................................21
A. Operational Overview ...........................................................................................................21
B. Normal Operation ................................................................................................................22
C. Manual Activation.................................................................................................................22
D. ELT Reset............................................................................................................................22
E. Functional Check..................................................................................................................22
3. Specifications...............................................................................................................................23
A. Environmental and Physical ..................................................................................................23
B. Electrical .............................................................................................................................24
C. Antennas .............................................................................................................................25
TEST AND FAULT ISOLATION..................................................................................................................26
1. Inspection and Test Regulatory Requirements ...............................................................................26
A. United States.......................................................................................................................26
B. Canada................................................................................................................................26

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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ME406 (453-6603), ME406HM (453-6604)
Page 7 of 72
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C. Other Countries ...................................................................................................................26
2. Inspection and Test Procedures ....................................................................................................27
A. Checklist..............................................................................................................................27
B. Preparation..........................................................................................................................27
C. Coax Cable and Wiring Connections Inspection – Item 1 ........................................................28
D. Mounting Tray and Hardware Inspection – Item 2 .................................................................28
E. Battery Pack Inspection – Item 3 ..........................................................................................28
F. G-Switch Functional Check – Item 4......................................................................................29
G. Performance Testing Setup...................................................................................................29
H. 121.5 MHz Frequency Measurement – Item 5a ......................................................................30
I. Audio Modulation Check – Item 5b........................................................................................30
J. 121.5 MHz Power Output Measurement – Item 5c .................................................................30
K. 406 MHz Frequency Measurement – Item 5d .........................................................................31
L. 406 MHz Power Output Measurement – Item 5e ....................................................................31
M. Current Draw Test – Item 5f.................................................................................................31
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..............................................................................................................................35
A. Self-Test Error Troubleshooting Guidelines ............................................................................35
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 ..........................................................................................................................47
3. Antenna ......................................................................................................................................48
A. Selection .............................................................................................................................48
B. Location ..............................................................................................................................48
C. Installation ..........................................................................................................................48
4. Remote Switch.............................................................................................................................50
A. Location ..............................................................................................................................50
B. Installation ..........................................................................................................................50

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ME406 (453-6603), ME406HM (453-6604)
Page 8 of 72
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5. Buzzer.........................................................................................................................................51
A. Location ..............................................................................................................................51
B. Installation ..........................................................................................................................51
6. Wiring .........................................................................................................................................52
A. General Considerations and Recommendations ......................................................................52
B. Remote Switch Harness Fabrication.......................................................................................55
C. ELT D-Sub 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. Remote Switch Alternate Power Source .................................................................................58
I. Airframe Ground Connections ...............................................................................................58
J. Buzzer Connections ..............................................................................................................59
K. Remote Switch Final Installation ...........................................................................................59
7. ELT Installation............................................................................................................................59
A. Installation and Test ............................................................................................................59
B. Harness ELT D-Sub Plug Sealing ...........................................................................................61
C. Installation Documentation ...................................................................................................61
8. Battery Pack Installation...............................................................................................................61
A. Battery Reinstallation ...........................................................................................................61
B. New Battery Installation .......................................................................................................63
9. Helicopter Installations - Special Considerations.............................................................................63
A. Background .........................................................................................................................63
B. Recommendations................................................................................................................63
C. Orientation ..........................................................................................................................64
APPENDIX A – ELT REGISTRATION..........................................................................................................65
1. Background Information ...............................................................................................................65
A. Hex ID Code ........................................................................................................................65
B. Reason for Registration ........................................................................................................65
C. Registration Information Resources.......................................................................................65
2. Registration .................................................................................................................................65
A. Responsibility.......................................................................................................................65
B. Required Information ...........................................................................................................65
C. Where to Register ................................................................................................................66
ILLUSTRATED PARTS LIST ......................................................................................................................67
1. Introduction.................................................................................................................................67
A. Purpose...............................................................................................................................67
B. IPL Usage Guide ..................................................................................................................67
2. Manufacturer Name and Address ..................................................................................................67
A. Ordering Information ...........................................................................................................67
3. Explanation of Detailed Parts List Entries .......................................................................................68
A. Fig # & Item Column ...........................................................................................................68
B. Part # Column .....................................................................................................................68
C. Nomenclature Column ..........................................................................................................68
D. UPA (Units Per Assembly) Column.........................................................................................69
4. Detailed Parts List ........................................................................................................................70

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ME406 (453-6603), ME406HM (453-6604)
Page 9 of 72
Mar 19/15
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LIST OF FIGURES
Figure 1 ELT Orthogonal Axes...........................................................................................................11
Figure 2 ME406 Series ELT and Mounting Tray Assembly....................................................................19
Figure 3 Remote Switch Front View...................................................................................................19
Figure 4 Buzzer................................................................................................................................20
Figure 5 Battery Pack Assembly ........................................................................................................20
Figure 6 Antennas............................................................................................................................20
Figure 7 ELT Operational Flow Diagram.............................................................................................21
Figure 8 Performance Testing Equipment Setup.................................................................................30
Figure 9 Current Draw Test Setup .....................................................................................................32
Figure 10 406 MHz Message Example................................................................................................33
Figure 11 ELT Removal Sequence .....................................................................................................39
Figure 12 Battery Pack Removal........................................................................................................40
Figure 13 ME406 Series ELT Outline and Dimensions .........................................................................45
Figure 14 ME406 Metal Strap Minimum Clearance Dimensions ............................................................46
Figure 15 Typical Mounting Tray Installation......................................................................................47
Figure 16 Rod Antenna 110-338 and Whip Antenna 110-773 Outlines and Dimensions.........................49
Figure 17 Remote Switch Outline and Dimensions..............................................................................50
Figure 18 Buzzer Outline and Dimensions ..........................................................................................51
Figure 19 Metal Airframe Wiring Diagrams.........................................................................................53
Figure 20 Composite Airframe Wiring Diagrams .................................................................................54
Figure 21 Remote Switch Harness Arrangement.................................................................................55
Figure 22 D-Sub Plug Assembly ........................................................................................................57
Figure 23 ELT Installation Sequence..................................................................................................59
Figure 24 Velcro Strap Installation & Inspection .................................................................................60
Figure 25 Battery Pack Installation ....................................................................................................62
Figure 26 ELT Orthogonal Axes .........................................................................................................64
Figure 27 ME406 Series ELT Main Assembly and Installation...............................................................70
Figure 28 Electrical Components .......................................................................................................71
Figure 29 Antennas ..........................................................................................................................72

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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ME406 (453-6603), ME406HM (453-6604)
Page 10 of 72
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INTRODUCTION
TASK 25-62-30-990-801
1. Manual Usage
SUBTASK 25-62-30-990-001
A. General
1) This manual describes the operation, installation, and maintenance of the Model ME406 Series
emergency locator transmitter (ELT). This information is provided to ensure initial and continued
airworthiness. Information presented in this manual is accurate at 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 65.
3) Web links provided in this manual were accurate at time of printing, but may be subject to change.
4) ACR Electronics 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.
SUBTASK 25-62-30-990-002
B. Application
1) This manual constitutes supporting data/documentation for the ME406 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 ME406 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 ME406 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) ME406 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 ME406 Series ELT. Other options, such as a different remote switch
configuration or a navigation interface, 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 ME406
Series ELT.
6) To ensure proper operation, only parts listed in the Illustrated Parts List of this manual or those
recommended by ACR Electronics, Inc., may be used as replacement parts for the ME406 Series ELT.

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ME406 (453-6603), ME406HM (453-6604)
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TASK 25-62-30-990-802
2. Model Descriptions
SUBTASK 25-62-30-990-001
A. ME406
1) The ME406 is a type AF (Automatic Fixed) beacon, which transmits on 121.5 and 406 MHz.
2) The ME406 ELT is enclosed in an impact resistant plastic casing and mounts on a tray made of similar
material.
3) When ordered as a system, an installation kit, cockpit remote switch, coax cables, audible buzzer, and
fixed antenna are provided.
SUBTASK 25-62-30-990-002
B. ME406HM
1) The ME406HM ELT is designed for helicopter installations and features a 5-axis G-Switch module in
addition to the primary G-switch, which is oriented to line-of-flight. This design allows the ELT to be
activated in all six axes. See Figure 1 ELT Orthogonal Axes
2) The ME406HM is identical to the ME406 in all other aspects.
Figure 1 ELT Orthogonal Axes

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
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Page 12 of 72
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TASK 25-62-30-990-803
3. Approvals
SUBTASK 25-62-30-990-001
A. ME406 and ME406HM
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 - Approval Letter File Reference 5012-E3-4 (3708020)
3) Industry Canada - Certification Number 1215B-ME406AF
4) ETSO 2C126 - EASA.IM.21O.416 (ME406) and EASA.IM.21O.608 (ME406HM)
5) COSPAS-SARSAT - Certificate No. 152, 188, 197 and 242
SUBTASK 25-62-30-990-002
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 ME406 Series ELT is certified under TSO C126.
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.
SUBTASK 25-62-30-990-003
C. RTCA DO-160D Compliance
1) DO-160D Environmental Categories: D1XBC[204][204]XRXXFXXZAZA[204]H[XXXX]XXA
2) The DO-160D environmental categories breakdown is detailed in Table 1 on page 13.

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ME406 (453-6603), ME406HM (453-6604)
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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
204 7.0/8.0 Operational Shock and Crash Safety/Vibration
X 9.0 Explosion
R 10.0 Waterproofness
X 11.0 Fluids Susceptibility
X 12.0 Sand and Dust
F 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
A 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
A 25.0 ESD
Table 1 Environmental Categories Breakdown

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TASK 25-62-30-990-804
4. Frequency Allocations
SUBTASK 25-62-30-990-001
A. Application
1) This section addresses the 406.0-406.1 MHz transmitter window and the specific frequency band
allocations residing above 406.025 MHz, beginning with 406.028 MHz, which are assigned or reserved
within the 406.0-406.1 MHz distress frequency window.
SUBTASK 25-62-30-990-002
B. Discussion
1) The 406 MHz transmitter frequency of the ME406 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 ME406 Series ELTs covered by this manual transmit on 406.028 MHz, current ME406
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.

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TASK 25-62-30-990-805
5. List of Acronyms, Abbreviations, and Definitions
SUBTASK 25-62-30-990-001
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 W 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.
D-Sub Connector D-shaped, subminiature connectors – common type of connector for small signals
and electrical currents.
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.

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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).
P/N Part Number – Refers to an ACR 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.
Receptacle The term “Receptacle,” within the context of this document, refers to the female
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 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.

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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ME406 (453-6603), ME406HM (453-6604)
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TASK 25-62-30-990-806
6. References
SUBTASK 25-62-30-990-001
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 on-line or source locations are
linked to applicable web sites.
3) United States
a) AC 43-9, “Maintenance Records”
b) AC 43-210, “Standardized Procedures for Requesting Field Approval of Data, Major Alterations,
and Repairs”
c) AC 43.9-1, “Instructions for Completion of FAA Form 337”
d) AC 43-13-1, “Acceptable Methods, Techniques, and Practices – Aircraft Inspection and Repair”
e) AC 43.13-2, “Acceptable Methods, Techniques, and Practices - Aircraft Alterations”
f) FAR, Part 43, “Maintenance, Preventive Maintenance, Rebuilding, and Alteration”
g) 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”
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)”
SUBTASK 25-62-30-990-002
B. Other Documents
1) The following documents are available on-line at the Artex products web site at www.acrartex.com, or
from ACR Electronics upon request.
a) 570-1000, “ELT Test Set (ETS) Operation Manual”

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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ME406 (453-6603), ME406HM (453-6604)
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DESCRIPTION AND OPERATION
TASK 25-62-30-870-801
1. Description
SUBTASK 25-62-30-870-001
A. Functional Overview
1) The ELT automatically activates during a crash and transmits the standard sweep tone on 121.5 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, or
b) Aircraft identification or registration number, and
c) Country of registration and country code; plus
d) Position coordinates, when coupled with a navigation interface device, which receives position
data from the aircraft navigation system and transmits it to the ELT.
3) The 406 MHz transmitter will operate for 24 hours and then shuts down automatically. The 121.5 MHz
transmitter will continue to operate until the batteries are exhausted, which is 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 MHz transmitters. When coupled to the aircraft navigation system via
a navigation interface, 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, and
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 MHz transmissions are used to home in on the crash site.
NOTE: Effective February 1, 2009, COSPAS-SARSAT has terminated satellite processing of distress
signals from 121.5 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,
b) The buzzer, or
c) 121.5 MHz transmissions, which can be monitored using the aircraft communications
transceiver or an AM radio tuned to 121.5 MHz.

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ME406 (453-6603), ME406HM (453-6604)
Page 19 of 72
Mar 19/15
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SUBTASK 25-62-30-870-002
B. Components
1) The ME406 Series ELT main assembly is housed in a high impact, fire resistant, polycarbonate plastic
case and mounted in a tray made of similar material. See Figure 2 ME406 Series ELT and Mounting Tray
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 ME406 Series ELT and Mounting Tray Assembly
2) The cockpit-mounted remote switch assembly is comprised of an ELT status LED and control switch, and
allows an operator to manually turn the ELT on (i.e., activate) for testing and reset (i.e., deactivate) the ELT.
See Figure 3 Remote Switch Front View.
NOTE: The ELT CANNOT be disarmed or disabled from the cockpit. Cockpit operation is limited to
deactivating or manually activating the ELT.
Figure 3 Remote Switch Front View

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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ME406 (453-6603), ME406HM (453-6604)
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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 ME406 Series ELT consists of two “D” size lithium manganese dioxide cells
connected in series. To prevent the cells from being charged, diodes and fuses are connected to the inline
power from each cell. The fuses also protect from high output. See Figure 5 Battery Pack Assembly.
Figure 5 Battery Pack Assembly
5) Two antennas are approved for use with the ME406 Series ELT. Selection of the proper antenna is
dependent upon end use, aircraft configuration and speed, and other factors. See Figure 6 Antennas.
Figure 6 Antennas