ACR Electronics COBHAM B406-4 User manual

25-62-03 Page 1 of 86
APR 06/10
570-5004 Rev. D
Initial Issue DEC 02/1999
Wulfsberg Electronics Division
6400 Wilkinson Rd., Prescott, AZ 86301
Cage Code: 1B7G3
Abbreviated Component Maintenance Manual
This manual includes data for the equipment that follows:
Component Part No. Model No.
B406-4
EMERGENCY LOCATOR TRANSMITTER
Emergency Locator Transmitter 453-5004 B406-4

COBHAM AVIONICS WULFSBERG ELECTRONICS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
B406-4 (453-5004)
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APR 06/10
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 Wulfsberg Electronics.
Information in this manual is subject to change without notice. Wulfsberg Electronics makes no warranty,
expressed or implied, with regard to this manual, including but not limited to any implied warranties of mer-
chantability, fitness for a particular purpose, and non-infringement. In addition, Wulfsberg Electronics makes
no warranty with regard to the documentation or data contained herein. Wulfsberg Electronics is not liable in
the event of incidentals, special, consequential, or any other damages in connection with or arising from fur-
nishing, performance, or use of this manual.
Reproduction of this publication or any portion thereof by any means is prohibited. for further information con-
tact Sales, Wulfsberg Electronics, 6400 Wilkinson Drive, Prescott, Arizona, 86301. Telephone [phone]
©2010 Wulfsberg Electronics. All rights reserved.

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COBHAM AVIONICS WULFSBERG ELECTRONICS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
B406-4 (453-5004)
RECORD OF REVISIONS
REV NO. DCN NO. DCN DATE REV NO. DCN NO. DCN DATE
- RELEASE Dec 02/1999
A ECO 1418 Jun 22/2000
B DCN 1641 Apr 11/2001
B DCN 1747 Jul 19/2001
B DCN 1965 Apr 04/2002
B DCN 2115 Dec 10/2002
B DCN 2356 Feb 11/2004
C DCN 2968 Mar 20/2007
C DCN 3174 Feb 26/2008
C DCN 3282 Aug 25/2008
D DCA W9414 Apr 06/2010

COBHAM AVIONICS WULFSBERG ELECTRONICS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
B406-4 (453-5004)
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COBHAM AVIONICS WULFSBERG ELECTRONICS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
B406-4 (453-5004)
SERVICE BULLETIN LIST
SERVICE
BULLETIN NO
ISSUE
DATE SUBJECT MANUAL REV NO
MANUAL
REV DATE

COBHAM AVIONICS WULFSBERG ELECTRONICS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
B406-4 (453-5004)
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COBHAM AVIONICS WULFSBERG ELECTRONICS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
B406-4 (453-5004)
LIST OF EFFECTIVE PAGES
SUBJECT PAGE DATE SUBJECT PAGE DATE
Title Page 1 Apr 06/10 Description and Operation 30 Apr 06/10
Notices 2 Apr 06/10 (cont.) 31 Apr 06/10
Record of Revisions 3 Apr 06/10 32 Apr 06/10
4 BLANK 33 Apr 06/10
Service Bulletin List 5 Apr 06/10 34 Apr 06/10
6 BLANK 35 Apr 06/10
List of Effective Pages 7 Apr 06/10 36 BLANK
8 Apr 06/10 Test and Fault Isolation 37 Apr 06/10
Table of Contents 9 Apr 06/10 38 Apr 06/10
10 Apr 06/10 39 Apr 06/10
11 Apr 06/10 40 Apr 06/10
12 Apr 06/10 41 Apr 06/10
List of Figures 13 Apr 06/10 42 Apr 06/10
14 BLANK 43 Apr 06/10
Introduction 15 Apr 06/10 44 Apr 06/10
16 Apr 06/10 45 Apr 06/10
17 Apr 06/10 46 Apr 06/10
18 Apr 06/10 47 Apr 06/10
19 Apr 06/10 48 Apr 06/10
20 Apr 06/10 49 Apr 06/10
21 Apr 06/10 50 Apr 06/10
22 Apr 06/10 Removal 51 Apr 06/10
23 Apr 06/10 52 Apr 06/10
24 Apr 06/10 53 Apr 06/10
25 Apr 06/10 54 BLANK
26 BLANK Installation 55 Apr 06/10
Description and Operation 27 Apr 06/10 56 Apr 06/10
28 Apr 06/10 57 Apr 06/10
29 Apr 06/10 58 Apr 06/10

COBHAM AVIONICS WULFSBERG ELECTRONICS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
B406-4 (453-5004)
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Installation 59 Apr 06/10 Appendix A 77 Apr 06/10
(cont.) 60 Apr 06/10 78 Apr 06/10
61 Apr 06/10 Illustrated Parts List 79 Apr 06/10
62 Apr 06/10 80 Apr 06/10
63 Apr 06/10 81 Apr 06/10
64 Apr 06/10 82 Apr 06/10
65 Apr 06/10 83 Apr 06/10
66 Apr 06/10 84 Apr 06/10
67 Apr 06/10 85 Apr 06/10
68 Apr 06/10 86 Apr 06/10
69 Apr 06/10
70 Apr 06/10
71 Apr 06/10
72 Apr 06/10
73 Apr 06/10
74 Apr 06/10
75 Apr 06/10
76 Apr 06/10
SUBJECT PAGE DATE SUBJECT PAGE DATE

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COBHAM AVIONICS WULFSBERG ELECTRONICS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
B406-4 (453-5004)
TABLE OF CONTENTS
RECORD OF REVISIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SERVICE BULLETIN LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LIST OF EFFECTIVE PAGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
LIST OF FIGURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
INTRODUCTION
1. Manual Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
B. Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2. Model Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
A. B406-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3. Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
A. B406-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
B. Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
C. RTCA DO-160D Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 1. Environmental Categories Breakdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4. Frequency Allocations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
A. Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
B. Discussion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5. List of Acronyms, Abbreviations, and Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
A. Regulatory Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
B. Other Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
DESCRIPTION AND OPERATION
1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
A. Functional Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
B. Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
A. Operational Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
B. Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
C. Manual Activation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
D. ELT Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
E. Functional Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
A. Environmental and Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 2. Environmental and Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
B. Electrical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 3. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

COBHAM AVIONICS WULFSBERG ELECTRONICS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
B406-4 (453-5004)
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C. Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 4. Antenna Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
TEST AND FAULT ISOLATION
1. Inspection and Test Regulatory Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
A. United States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
B. Canada . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
C. Other Countries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2. Inspection and Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
A. Checklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 5. ELT Inspection and Test Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
B. Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
C. Coax Cables and Wiring Connections Inspection – Item 1 . . . . . . . . . . . . . . . . . . . . . . . . . . 40
D. Mounting Tray and Hardware Inspection – Item 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
E. Battery Pack Inspection – Item 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
F. G-Switch Functional Check – Item 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
G. Performance Testing Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
H. 121.5 MHz Frequency Measurement – Item 5a. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
I. Audio Modulation Check – Item 5b . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
J. 121.5/243.0 MHz Power Output Measurement – Item 5c. . . . . . . . . . . . . . . . . . . . . . . . . . . 43
K. 406 MHz Frequency Measurement – Item 5d . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
L. 406 MHz Power Output Measurement – Item 5e. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
M. Current Draw Test – Item 5f . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
N. Digital Message Verification – Item 5g. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
O. ELT Reset Check – Item 5h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
P. Installed Transmitter Test – Item 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Q. Antenna Test – Item 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
R. Inspection and Test Documentation – Item 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
3. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
A. Self-Test Error Troubleshooting Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 6. ELT Self-Test Error Codes Troubleshooting Guide. . . . . . . . . . . . . . . . . . . . . . . . . 48
B. ELT Troubleshooting Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Table 7. ELT Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
REMOVAL
1. ELT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
A. ELT Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
2. Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
A. Battery Pack Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
3. Material or Equipment Return. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
A. Shipment Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
B. Return Material Authorization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

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COBHAM AVIONICS WULFSBERG ELECTRONICS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
B406-4 (453-5004)
INSTALLATION
1. Regulatory Requirements and Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
A. TSO C126, Paragraph D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
B. FAA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
C. Canada. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
D. Other Countries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
E. RTCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
2. Mounting Tray. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
A. Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
B. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
3. Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
A. Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
B. Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
C. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
4. Remote Switch Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
A. Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
B. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
5. Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
A. Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
B. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
6. Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
A. General Considerations and Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
B. Remote Switch Panel Harness Fabrication and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 65
C. Buzzer Wiring Fabrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
D. ELT 12-Pin Receptacle Wiring Fabrication and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 68
E. Coax Cables Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
F. Antenna Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
G. Airframe Ground Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
H. Buzzer Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
I. Remote Switch Panel Final Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
7. ELT Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
A. Installation and Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
B. Harness ELT Receptacle Sealing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
C. Installation Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
8. Battery Pack Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
A. Battery Reinstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
B. New Battery Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
APPENDIX A – ELT REGISTRATION
1. Background Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
A. Hex ID Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
B. Reason for Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
C. Registration Information Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

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2. Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
A. Responsibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
B. Required Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
C. Where to Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
ILLUSTRATED PARTS LIST
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
A. Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
B. IPL Usage Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
2. Manufacturer Name and Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
A. Ordering Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
3. Explanation of Detailed Parts List Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
A. Fig # & Item Column. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
B. Part # Column . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
C. Nomenclature Column . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
D. UPA (Units Per Assembly) Column. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
4. Detailed Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

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B406-4 (453-5004)
LIST OF FIGURES
Figure 1. B406-4 ELT and Mounting Frame Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 2. Remote Switch Panel Assembly Front View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 3. Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 4. Battery Pack Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 5. Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 6. ELT Operational Flow Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 7. Performance Testing Equipment Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 8. Current Draw Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 9. Short and Long 406 MHz Message Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 10. ELT Removal Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 11. Battery Pack Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Figure 12. B406-4 ELT Outline and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Figure 13. Typical Mounting Tray Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Figure 14. Rod Antenna 110-320 and Blade Antenna 110-328-01 Outlines and Dimensions . . . . . . . . . . 61
Figure 15. Blade Antennas 110-333 and 110-337 Outlines and Dimensions . . . . . . . . . . . . . . . . . . . . . . 62
Figure 16. Remote Switch Panel Assembly Outline and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Figure 17. Buzzer Outline and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Figure 18. Remote Switch Panel Harness Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Figure 19. Remote Switch Panel Harness Wiring at ELT End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Figure 20. ELT Installation Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Figure 21. Battery Pack Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Figure 22. Battery Pack Retaining Screw Tightening Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Illustrated Parts List
Figure 23. B406-4 ELT Main Assembly and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Figure 24. Electrical Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Figure 25. Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

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THIS IS A BLANK PAGE

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COBHAM AVIONICS WULFSBERG ELECTRONICS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
B406-4 (453-5004)
INTRODUCTION
TASK 25-62-03-990-801
1. Manual Usage
SUBTASK 25-62-03-990-001
A. General
(1) This manual describes the operation, installation, and maintenance of the Model B406-4
emergency locator transmitter (ELT). The 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 web site at www.artex.net 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 77.
(3) Web links provided in this manual were accurate at time of printing but may be subject to
change.
(4) Wulfsberg Electronics reserves the right to add approved components to the ELT system;
including, but not limited to antennas, remote switch panels, 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 25-62-03-990-002
B. Application
(1) This manual constitutes supporting data/documentation for the B406-4 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 B406-4 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 B406-4 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.

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(4) B406-4 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 panel and antennas) addressed in this manual are the
accessories most commonly associated with the B406-4 ELT. Other options, such as a
different remote switch panel configuration or an ELT/NAV Interface -B, should be installed
and maintained in accordance with the written instructions specific to the accessory.
NOTE: Contact Wulfsberg Electronics for optional accessories approved for use with the
B406-4 ELT.
(6) To ensure proper operation, only parts listed in the Illustrated Parts List of this manual or
those recommended by Wulfsberg Electronics may be used as replacement parts for the
B406-4 ELT.

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ABBREVIATED COMPONENT MAINTENANCE MANUAL
B406-4 (453-5004)
TASK 25-62-03-990-802
2. Model Description
SUBTASK 25-62-03-990-001
A. B406-4
(1) The B406-4 is a type AF (Automatic Fixed) ELT, which transmits on 121.5, 243.0, and 406
MHz.
(2) The ELT is enclosed within a multi-piece mounting frame consisting of a mounting tray
assembly, protective top cover assembly and mounting frame cap assembly.
(3) When ordered as a system, an installation kit, cockpit remote switch panel, coax cables,
audible buzzer, and dual input antenna are provided.

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TASK 25-62-03-990-803
3. Approvals
SUBTASK 25-62-03-990-001
A. B406-4
(1) FAA TSO C126, Type AF
NOTE: Details of TSO certification for the B406-4 ELT are available in the “B406-4 TSO Test
Report” (572-0010).
(a) The conditions and tests required for TSO approval of this article are minimum
performance standards. It is the responsibility of those installing this article either on or
within a specific type or class of aircraft to determine that the aircraft installation
conditions are within TSO standards. TSO articles must have separate approval for
installation in an aircraft. The article may be installed only if performed under 14 CFR
Part 43 or the applicable airworthiness requirements.
(2) Transport Canada - Type Certificate Data Sheet AP-47 Issue 2
(3) Industry Canada - Certification Number 1215873110AF
(4) JTSO-2C126
(5) COSPAS-SARSAT - Certificate No. 112 or 170
SUBTASK 25-62-03-990-002
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 B406-4 ELT is certified under TSO C142.
NOTE: Details of TSO certification are available in the “452-0133 - 406 Lithium Battery Pack
TSO C142 Report” (572-0043).
(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 25-62-03-990-003
C. RTCA DO-160D Compliance
(1) DO-160D Environmental Categories: C1-BA204XRXXXXXZAZZ204BXXX
(2) The DO-160D environmental categories breakdown is detailed in Table 1, on page 19.

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ABBREVIATED COMPONENT MAINTENANCE MANUAL
B406-4 (453-5004)
Table 1. Environmental Categories Breakdown
CATEGORY SECTION DESCRIPTION
C1 4.0 Temperature/Altitude
- 4.5.4 In-Flight Loss of Cooling
B 5.0 Temperature Variation
A6.0 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
X 13.0 Fungus
X 14.0 Salt Spray
X 15.0 Magnetic Effect
Z 16.0 Power Input
A 17.0 Voltage Spike
Z 18.0 Audio Frequency Susceptibility
Z 19.0 Induced Signal Susceptibility
204 20.0 Radio Frequency Susceptibility
B 21.0 Emission of RF Energy
X 22.0 Lightning
X 23.0 Lightning Direct Effects
X 24.0 Icing

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TASK 25-62-03-990-804
4. Frequency Allocations
SUBTASK 25-62-03-990-001
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 25-62-03-990-002
B. Discussion
(1) The 406 MHz transmitter frequency of the B406-4 ELT was originally 406.025 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 B406-4 ELTs covered by this manual transmit on 406.025 MHz, current
B406-4 ELTs may not. The product identification label on each ELT specifies the transmitting
frequencies of the individual ELT. The 406 MHz component may be 406.025, 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 406.025 MHz.