ARTEX ELT 345 Instruction Manual

Page 1 of 58
JUN 15/16
Y1-03-0282 Rev. E
Initial Issue August 6, 2015
ARTEX PRODUCTS / ACR ELECTRONICS, INC.
5757 Ravenswood Rd, Ft. Lauderdale, FL 33312
Cage Code: 18560
25-62-35
ARTEX ELT 345
Emergency Locator Transmitter
Description, Operation, Installation and Maintenance Manual
Y1-03-0282 Rev. E
This manual includes data for the following equipment:
Component
Labeled Part No.
Purchase Part No.
Emergency Locator Transmitter
A3-06-2880
8100
2-Wire Remote Switch
A3-06-2759
8304
Mounting Tray
A3-06-2882
8323
Installation Kit
455-7423
455-7423
Antenna w/Coax (black)
A3-06-2892-1
8324 in kit
Cable, Coaxial, BNC to BNC, 6 ft
611-6013-04
611-6013-04
ELT 345 Kit
8102
8102
Battery Pack, LiMnO2
A3-06-2883
8322
External Buzzer
452-6505
452-6505

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 2 of 58
25-62-35
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 33312-6603. 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 33312-6603. Telephone [phone].

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 3 of 58
25-62-35
RECORD OF REVISIONS
REVISION
CHANGE
DATE
REVISION
CHANGE
DATE
A
W/I 05-EN-05
Aug 06/15
B
ECO 16144
Sept 15/15
C
ECO 16240
Jan 19/16
D
ECO 16376
May 9/16
E
ECO 16385
Jun 15/16

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 4 of 58
25-62-35
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
ELT 345 (P/N: A3-06-2880)
Page 5 of 58
25-62-35
LIST OF EFFECTIVE PAGES
SUBJECT
PAGE
DATE
SUBJECT
PAGE
DATE
Title Page
1
Jun 15/16
Test and Fault Isolation (cont.)
30
Sept 15/15
Notices
2
Sept 15/15
31
Sept 15/15
Record of Revisions
3
Jun 15/16
32
Jan 19/16
Service Bulletin List
4
Sept 15/15
33
Sept 15/15
List of Effective Pages
5
Jun 15/16
Removal
34
Sept 15/15
Table of Contents
6
Sept 15/15
35
Sept 15/15
7
Sept 15/15
36
Sept 15/15
8
Sept 15/15
Installation
37
Sept 15/15
List of Figures
9
Jan 19/16
38
Sept 15/15
Introduction
10
Sept 15/15
39
Sept 15/15
11
Sept 15/15
40
Sept 15/15
12
Sept 15/15
41
Sept 15/15
13
Sept 15/15
42
Sept 15/15
14
Sept 15/15
43
Sept 15/15
15
Sept 15/15
44
Dec 10/15
16
Sept 15/15
45
Dec 10/15
Description and Operation
17
Sept 15/15
46
Sept 15/15
18
Sept 15/15
47
Dec 10/15
19
Sept 15/15
48
Dec 10/15
20
Sept 15/15
49
Dec 10/15
21
Sept 15/15
50
Dec 10/15
22
Sept 15/15
51
Dec 10/15
23
Sept 15/15
52
Sept 15/15
Test and Fault Isolation
24
Sept 15/15
Illustrated Parts List
53
Sept 15/15
25
Sept 15/15
54
Sept 15/15
26
Jan 19/16
55
Sept 15/15
27
Sept 15/15
56
Sept 15/15
28
May 9/16
Appendix A
57
Sept 15/15
29
Jun 15/16
58
Sept 15/15

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 6 of 58
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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 Description ........................................................................................................................ 11
A. ELT 345 .............................................................................................................................. 11
3. Approvals.................................................................................................................................... 11
A. ELT..................................................................................................................................... 11
B. Battery ............................................................................................................................... 11
C. RTCA DO-160G Compliance.................................................................................................. 12
4. Frequency Allocation.................................................................................................................... 13
A. Application .......................................................................................................................... 13
B. Discussion........................................................................................................................... 13
5. List of Acronyms, Abbreviations and Definitions............................................................................. 14
6. References.................................................................................................................................. 16
A. Regulatory Documents......................................................................................................... 16
B. Other Documents ................................................................................................................ 16
DESCRIPTION AND OPERATION.............................................................................................................. 17
1. Description.................................................................................................................................. 17
A. Functional Overview ............................................................................................................ 17
B. System Components ............................................................................................................ 18
2. Operation.................................................................................................................................... 20
A. Overview ............................................................................................................................ 20
B. Normal Operation ................................................................................................................ 20
C. Manual Activation ................................................................................................................ 20
D. ELT Reset ........................................................................................................................... 21
E. Functional Check ................................................................................................................. 21
3. Specifications .............................................................................................................................. 21
A. Environmental and Physical.................................................................................................. 21
B. Electrical ............................................................................................................................. 22
C. Antenna.............................................................................................................................. 23
TEST AND FAULT ISOLATION ................................................................................................................. 24
1. Inspection and Test Regulatory Requirements............................................................................... 24
A. United States ...................................................................................................................... 24
B. Canada ............................................................................................................................... 24

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 7 of 58
25-62-35
C. Other Countries................................................................................................................... 24
2. Inspection and Test Procedures.................................................................................................... 25
A. Checklist ............................................................................................................................. 25
B. Preparation ......................................................................................................................... 25
C. Coax Cable and Wiring Connections Inspection –Item 1........................................................ 25
D. Mounting Tray and Hardware Inspection –Item 2 ................................................................. 26
E. Battery Pack Inspection –Item 3.......................................................................................... 26
F. G-Switch Functional Check –Item 4 ..................................................................................... 26
G. Performance Test Setup....................................................................................................... 27
H. 121.5 MHz Frequency Measurement and Audio Modulation Check–Items 5a and 5b ............... 27
I. 121.5 MHz Power Output Measurement –Item 5c ................................................................. 28
J. 406 MHz Frequency Measurement –Item 5d ........................................................................ 28
K. 406 MHz Power Output Measurement –Item 5e.................................................................... 28
L. Current Draw Test –Item 5f ................................................................................................ 28
M. Digital Message Verification –Item 5g .................................................................................. 29
N. ELT Reset Check –Item 5h .................................................................................................. 30
O. Installed Transmitter / Antenna Test –Item 6 ....................................................................... 30
P. Antenna Test –Item 7......................................................................................................... 31
Q. Inspection and Test Documentation –Item 8 ........................................................................ 31
3. Fault Isolation ............................................................................................................................. 31
A. Self-Test ............................................................................................................................. 31
B. Troubleshooting .................................................................................................................. 33
REMOVAL .............................................................................................................................................. 34
1. ELT............................................................................................................................................. 34
A. ELT Removal ....................................................................................................................... 34
2. Battery ....................................................................................................................................... 35
A. Battery Removal.................................................................................................................. 35
3. Material or Equipment Return....................................................................................................... 36
A. Shipment Information .......................................................................................................... 36
B. Return Material Authorization ............................................................................................... 36
INSTALLATION....................................................................................................................................... 37
1. Regulatory Requirements and Guidelines ...................................................................................... 37
A. For US Registered aircraft: ................................................................................................... 37
B. TSO C126b, Paragraph D ..................................................................................................... 37
C. FAA .................................................................................................................................... 37
D. Canada ............................................................................................................................... 38
E. Other Countries................................................................................................................... 38
F. RTCA .................................................................................................................................. 38
2. Mounting Tray............................................................................................................................. 39
A. Location.............................................................................................................................. 39
B. Installation.......................................................................................................................... 41
3. Antenna...................................................................................................................................... 42
A. General............................................................................................................................... 42
B. Location.............................................................................................................................. 42
C. Installation General Info ...................................................................................................... 42
4. Remote Switch ............................................................................................................................ 43
A. Location.............................................................................................................................. 43
B. Installation.......................................................................................................................... 43

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 8 of 58
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5. Buzzer ........................................................................................................................................ 44
A. Location.............................................................................................................................. 44
B. Installation.......................................................................................................................... 44
6. Wiring......................................................................................................................................... 45
A. General Considerations and Recommendations...................................................................... 45
B. Remote Switch Harness Fabrication ...................................................................................... 46
C. ELT D-Sub Plug Installation.................................................................................................. 48
D. Cockpit Remote Switch 9-Pin Plug Installation ....................................................................... 49
E. Antenna Connection ............................................................................................................ 49
F. Airframe Ground Connections............................................................................................... 49
G. ELT Programming................................................................................................................ 49
H. RS-232 Acceptable Nav Data ................................................................................................ 49
7. ELT Installation and Test ............................................................................................................. 49
A. Installation.......................................................................................................................... 49
B. Harness ELT D-Sub Plug Sealing........................................................................................... 50
C. Installation Documentation .................................................................................................. 51
8. Battery Pack Installation .............................................................................................................. 51
A. Battery Installation and Reinstallation ................................................................................... 51
ILLUSTRATED PARTS LIST...................................................................................................................... 53
1. Introduction ................................................................................................................................ 53
A. Purpose .............................................................................................................................. 53
B. IPL Usage Guide.................................................................................................................. 53
2. Manufacturer Name and Address.................................................................................................. 53
A. Ordering Information ........................................................................................................... 53
APPENDIX A –ELT REGISTRATION ......................................................................................................... 57
1. Background Information .............................................................................................................. 57
A. Hex ID Code (15-Hex ID)..................................................................................................... 57
2. Registration ................................................................................................................................ 57
A. Responsibility ...................................................................................................................... 57
B. Required Information........................................................................................................... 57
C. Registration Information Resources ...................................................................................... 58
D. Where to Register ............................................................................................................... 58

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 9 of 58
25-62-35
LIST OF FIGURES
Figure 1 ARTEX ELT 345 Beacon and Mounting Tray.......................................................................... 18
Figure 2 Remote Switch Front View .................................................................................................. 18
Figure 3 Buzzer ............................................................................................................................... 19
Figure 4 Battery Pack Assembly........................................................................................................ 19
Figure 5 Antennas ........................................................................................................................... 19
Figure 6 Performance Test Setup...................................................................................................... 27
Figure 7 Current Draw Test Setup .................................................................................................... 29
Figure 8 Short & Long 406 MHz Message Examples ........................................................................... 30
Figure 9 ELT Removal Sequence....................................................................................................... 34
Figure 10 Battery Pack Removal ....................................................................................................... 35
Figure 11 ARTEX ELT 345 Outline & Dimensions................................................................................ 39
Figure 12 ELT 345 Metal Strap Minimum Clearance Dimensions.......................................................... 40
Figure 13 Typical Mounting Tray Installation ..................................................................................... 41
Figure 14 A3-06-2892-1 Antenna Outlines and Dimensions ................................................................ 43
Figure 15 Remote Switch Outline and Dimensions ............................................................................. 43
Figure 16 Buzzer Outline and Dimensions ......................................................................................... 44
Figure 17 Typical 2-Wire Installation for Unshielded Harness.............................................................. 45
Figure 18 Typical 2-Wire Installation for Shielded Harness ................................................................. 46
Figure 19 Harness Plug Assembly ..................................................................................................... 48
Figure 20 ELT Installation Sequence ................................................................................................. 50
Figure 21 Battery Pack Installation ................................................................................................... 51
Figure 22 ELT 345 Main Assembly and Installation............................................................................. 54
Figure 23 Harness Components ........................................................................................................ 55
Figure 24 Antennas ......................................................................................................................... 56

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 10 of 58
25-62-35
INTRODUCTION
TASK 25-62-35-990-801
1. Manual Usage
SUBTASK 25-62-35-990-001
A. General
1) This manual describes the operation, installation and maintenance of the ARTEX ELT 345 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 web
site at www.acrartex.com for the latest information and any updates to this manual.
2) Information on the COSPAS-SARSAT emergency locator beacon registration requirements and procedures is
provided in Appendix A –ELT Registration on page 57.
3) ACR Electronics reserves the right to add approved components to the ELT system; including but not limited to
antennas, remote switches and coaxial cables. These changes are approved as “minor changes” pursuant to
FAR 21, Subpart O for TSO holders.
4) Regulatory references contained herein are generally confined to Web links provided in this manual and were
accurate at time of printing, but may be subject to change. Consult your national aviation authority for
applicable requirements.
SUBTASK 25-62-35-990-002
B. Application
1) This manual constitutes supporting data/documentation for the ARTEX ELT 345, 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 ARTEX ELT 345 must be installed and maintained in accordance with the requirements
herein, 14 CFR, FAR Parts 43, -91 and other airworthiness requirements, as applicable.
3) In Canada, the ARTEX ELT 345 must be installed and maintained in accordance with the requirements herein
as well as Canadian Aviation Regulations (CAR); Part V, Paragraph 551.104 as well as other CAR airworthiness
requirements, as applicable.
4) ARTEX ELT 345 installation and maintenance in all other countries must comply with the requirements herein
as well as applicable national airworthiness requirements.
5) The accessories (i.e. remote switch and antennas) referenced in this manual are those most commonly
associated with the ARTEX ELT 345. Other options, such as an alternative remote switch configuration or a
navigation interface, should be installed and maintained in accordance with instructions specific to the
accessory.
NOTE: Contact ACR Electronics, Inc. for optional accessories approved for use with the ARTEX ELT 345.
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 ARTEX ELT 345.

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 11 of 58
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TASK 25-62-35-990-802
2. Model Description
SUBTASK 25-62-35-990-001
A. ELT 345
1) The ARTEX ELT 345 is a type AF (Automatic Fixed) beacon, which transmits on 121.5 and 406 MHz.
2) The housing is made of impact-resistant polycarbonate-polyester plastic.
3) The mounting tray is made of aluminum with a stainless steel strap.
4) An installation kit, cockpit remote switch, coax cable, audible buzzer and fixed antennas are included in the kit.
TASK 25-62-35-990-803
3. Approvals
SUBTASK 25-62-35-990-001
A. ELT
1) FAA TSO C126b, type AF
a) This article meets the minimum performance and quality control standards required by a technical standard
order (TSO). Installation of this article requires separate approval.
2) COSPAS-SARSAT
3) For all other type approval information, please refer to the ARTEX web site at www.acrartex.com.
SUBTASK 25-62-35-990-002
B. Battery
CAUTION: LITHIUM BATTERY SAFETY CONCERNS INCLUDE THE POSSIBILITY OF FIRE, VENTING
VIOLENTLY, AND VENTING OF TOXIC GASES.
1) The lithium battery packs used on the ARTEX ELT 345 are certified under TSO C142a.
NOTE: The conditions and tests for TSO approval of this article are minimum performance standards.
Those installing this article, on or in a specific type or class of aircraft, must determine that the
aircraft installation conditions are within the TSO standards. TSO articles must have separate
approval for installation in an aircraft. The article may be installed only according to 14 CFR
part 43 or the applicable airworthiness requirements. Lithium cell and battery safety concerns
include the possibility of fire and venting of toxic gases.
2) If the battery is installed by a third party, it must be ascertained whether it is an ARTEX Authorized Service
center. To find an authorized service center, go to
http://www.acrartex.com/where-to-buy/find-a-battery-service-provider/

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 12 of 58
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SUBTASK 25-62-35-990-003
C. RTCA DO-160G Compliance
1) DO-160G Environmental Categories:
[C1X]BC[DO-204a][S(C)]XRXXXSZZAZ[ZCX][DO-204a]M[XXXXXX][XXXX]XXX
2) The DO-160G environmental categories breakdown is detailed in Table 1.
CAT
SECTION
DESCRIPTION
COMMENTS
C1
4.0
Temperature/Altitude
X
4.5.5
In-Flight Loss of Cooling
Not Applicable
B
5.0
Temperature Variation
B = 5°C/min
C
6.0
Humidity
10 Day Test
DO-204A
7.0
Operational Shocks and
Crash Safety
Tested to RTCA DO-204A Requirements
[S(C)]
8.0
Vibration
X
9.0
Explosion Atmosphere
Test
Not Applicable
R
10.0
Waterproofness
Continuous Stream
X
11.0
Fluid Susceptibility
Not Applicable
X
12.0
Sand and Dust
Not Applicable
X
13.0
Fungus Resistance Test
Not Applicable
S
14.0
Salt Fog
Z
15.0
Magnetic Effect Test
Z
16.0
Power Input Test
A
17.0
Voltage Spikes
Z
18.0
AF Susceptibility
ZCX
19.0
Induced Signal
Susceptibility
DO-204A
20.0
RF Susceptibility
Tested to RTCA DO-204A Requirements
M
21.0
RF Emissions
[XXXXXX]
22.0
Lightning Induced
Transient Susceptibility
Not Applicable
[XXXX]
23.0
Lightning Direct Effects
Not Applicable
X
24.0
Icing Test
Not Applicable
X
25.0
Electrostatic Discharge
Test
X
26.0
Fire, Flammability Test
Fire Resistance ED-62A Optional for ELT(AF)
Table 1 Environmental Categories

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 13 of 58
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TASK 25-62-35-990-804
4. Frequency Allocation
SUBTASK 25-62-35-990-001
A. Application
1) This section addresses the 406.0 - 406.1 MHz transmitter frequencies which are assigned to the distress
frequency band.
SUBTASK 25-62-35-990-002
B. Discussion
1) The product identification label on each ELT specifies the transmission frequencies of the individual ELT. The
ARTEX ELT 345 transmits a frequency of 406.040 MHz. Allocation of frequencies, based on beacon population
per specified frequency band, is controlled by COSPAS-SARSAT.
2) 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.

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 14 of 58
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TASK 25-62-35-990-805
5. List of Acronyms, Abbreviations and Definitions
SUBTASK 25-62-35-990-001
Term Definition
AC Advisory Circular –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 coax cable connector having 50Ω 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, http://www.cospas-sarsat.int/en/
D-SUB RECEPTACLE D-type (shaped), subminiature connectors –connector for low voltage/current 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 is 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 when 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
ELT 345 (P/N: A3-06-2880)
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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 Velocity switch that detects sudden deceleration 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 precedes 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.
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 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 Refers to a room designed to block 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 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, 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 –The ratio of the amplitude of a partial standing wave at an
antinode (maximum) to the amplitude at an adjacent node (minimum), in an electrical
transmission line. An ideal transmission line would have a VSWR of 1:1.

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 16 of 58
25-62-35
TASK 25-62-35-990-806
6. References
SUBTASK 25-62-35-990-001
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) CFR Title 47, Part 87, “Aviation Services”
g) FAR, Part 43, “Maintenance, Preventive Maintenance, Rebuilding, and Alteration”
h) FAR, Part 91, “General Operating and Flight Rules”
i) TSO-C126b, “406 MHz Emergency Locator Transmitter (ELT)”
j) TSO-C142a, “Non-Rechargeable Lithium Cells and Batteries”
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-160G, “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-204A, “Minimal Operational Performance Standards for 406 MHz Emergency Locator Transmitters
(ELT)”
SUBTASK 25-62-35-990-002
B. Other Documents
1) The ARTEX model beacon programmer or beacon test set operating manuals are available from ACR Electronics
upon request:
a) Document number 570-1000, “453-1000 ELT Test Set Operation”
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 Operation”

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 17 of 58
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DESCRIPTION AND OPERATION
TASK 25-62-35-870-801
1. Description
SUBTASK 25-62-35-870-001
A. Functional Overview
1) The ELT automatically activates during a crash and transmits a continuous standard sweep tone on the 121.5
MHz frequency. Approximately every 50 seconds, the 406 MHz transmitter turns on and transmits an encoded
signal of either 440ms or 520ms, depending on the beacon programming protocol. This message is received by
the COSPAS-SARSAT Search and Rescue (SAR) satellite system.
2) The information contained in the message includes:
a) Beacon serial number, or
b) Aircraft identification or registration number
c) Country of registration and country code
d) Position coordinates, if beacon is programmed to receive position data from the aircraft navigation system
3) When the 406 MHz signal is detected by the Cospas–Sarsat satellite system, a position is calculated and the
121.5 MHz signal is used to home in on the crash site.
4) The 406 MHz transmitter will operate in this mode for 24 hours and then shut down automatically. The 121.5
MHz transmitter (homer transmitter) will continue to operate until the batteries are exhausted, which is at least
50 hours.
5) The location accuracy of the 406 MHz transmitter is typically 3 km. If position information is extracted from the
aircraft navigation system, the accuracy improves to approximately 100 meters (standard or national location
protocol).
6) The 406 MHz digital message provides search and rescue authorities the information to contact the
owner/operator of the aircraft through information contained in a database. The database may include:
a) Type of aircraft and aircraft registration number,
b) Owner address and telephone number, and
c) Alternate emergency contact.
7) Previous to February 9, 2009, the COSPAS-SARSAT system used the 121.5 MHz signal as an aid to determine
beacon location. As of this date, the use of this signal for satellite location has been terminated, as the accuracy
proved too poor. 406 MHz capable ELTs replace the older Class B beacons.
8) 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 the frequency 121.5 MHz.

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 18 of 58
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SUBTASK 25-62-35-870-002
B. System Components
1) The ARTEX ELT 345 housing assembly is made of high impact, fire resistant, polycarbonate-polyester plastic.
The tray is fabricated from aluminum, with a stainless steel holding strap. See Figure 1.
Figure 1 ARTEX ELT 345 Beacon and Mounting Tray
2) The cockpit-mounted remote switch assembly includes a status LED and control switch. The switch allows the
operator to manually activate and reset the ELT for testing (see Figure 2).
Figure 2 Remote Switch Front View

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 19 of 58
25-62-35
3) The buzzer provides an audible alert when the ELT is active (see Figure 3).
Figure 3 Buzzer
4) The battery pack for the ARTEX ELT 345 consists of two “D” size Lithium Manganese Dioxide cells (see
Figure 4).
Figure 4 Battery Pack Assembly
5) There is only one type of antenna that is approved for use with the ARTEX ELT 345 (see Figure 5). This antenna
is ARTEX part # A3-06-2892-1
Figure 5 Antennas

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 20 of 58
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TASK 25-62-35-870-802
2. Operation
SUBTASK 25-62-35-870-001
A. Overview
1) A primary feature of the ARTEX ELT 345 is its simplicity of operation.
2) A connection jumper (“G-switch loop”) between pins 5 and 12 on the D-sub receptacle enables the G-switch
circuitry, allowing activation when the acceleration threshold is exceeded. The jumper is located in the mating
D-sub receptacle of the cockpit remote switch wire harness. When this D-sub receptacle is removed, the ELT
can be manipulated without the possibility of activation.
3) With the G-switch loop in place, neither the cockpit remote switch nor the ELT control switch can be positioned
to prevent automatic activation. With the G-switch loop open (removed), the ELT cannot be activated by
dropping, rough handling or during shipping.
NOTE: The toggle switch can still activate the ELT regardless of G-switch loop status.
4) Activation is indicated by the presence of the swept audio tone transmitted on the 121.5 MHz signal, the buzzer
sounding and the flashing cockpit remote switch and/or ELT status LED. All these indicators immediately begin
upon ELT activation.
5) To reset the beacon, the position of either the local ELT switch or the cockpit remote switch must be changed
from ‘ON’ to ‘ARMED’. If activation is from the G-switch, the switch position must first be set to ‘ON’ then
changed to ‘ARMED’.
NOTE: The ELT g-switch CANNOT be disarmed or disabled from the cockpit. Cockpit operation is
limited to activating and resetting the ELT.
6) A warning buzzer is required by TSO C126b to indicate ELT activation when the aircraft is not operating. The
buzzer is powered by the ELT and is not dependent upon the aircraft power for operation. The indicator ‘beeps’
periodically, with the periods between pulses increasing with activation time.
SUBTASK 25-62-35-870-002
B. Normal Operation
NOTE: The beacon will begin transmitting approximately 50 seconds after activation and will continue
to do so approximately every 50 seconds until ELT is deactivated.
1) In normal operation, the ELT is ‘ready to activate’. The cockpit remote switch and the control switch on the ELT
are both in the “ARM” position. The G-switch loop (connection jumper between pins 5 and 12 of the D-sub
receptacle) is in place to enable the ELT. In this condition, if the ELT movement causes the G-switch threshold
to be exceeded, the beacon will activate.
SUBTASK 25-62-35-870-003
C. Manual Activation
1) The ELT may be manually activated by placing either the remote switch or the ELT control switch in the ON
position. This forces the ELT to activate, regardless of whether or not the G-switch loop is in place.
NOTE: The ELT cannot be reset if either the cockpit remote switch or the ELT control switch is in the
ON position.