Garmin GTX 3x5 Series, GTX 325, GTX 335, GTX 345R, GTX 335R Installation Manual

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CONTROL
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5/8/15

Experimental Release

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1. DESCRIPTION: TSO Installation Manual

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GTX 3x5 Transponder TSO Installation Manual

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GTX 3x5 Transponder

TSO Installation Manual

190-01499-02 May 2015 Revision 1

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RECORD OF REVISIONS

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Revision Revision Date Subject

1 5/8/15 Experimental Release.

190-01499-02 GTX 3x5 TSO Installation Manual
Rev. 1 Page A

INFORMATION SUBJECT TO EXPORT CONTROL LAWS

WARNING

WARNING

NOTE

WARNING

CAUTION

NOTE

This document may contain information which is subject to the Export Administration Regulations (EAR)
issued by the United States Department of Commerce (15 Code of Federal Regulations (CFR), Chapter
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the Export Administration Act of 1979. Include this notice with any reproduced portion of this document.

DEFINITIONS OF WARNINGS, CAUTIONS, AND NOTES

Warnin g s indicate that immediate attention must be given to avoid potential equipment
damage and personal injury should the instructions be disregarded.

Cautions indicate an alert to potential damage to the equipment if the procedural step
is not directly followed.

Notes indicate additional information needed.

This products packaging and components contain chemicals known to the State of
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190-01499-02 GTX 3x5 TSO Installation Manual
Rev. 1 Page i

TABLE OF CONTENTS

1 SYSTEM OVERVIEW .....................................................................................................................1-1

1.1 Scope .........................................................................................................................................1-1

1.2 Equipment Description ..............................................................................................................1-1

1.3 Definitions and Abbreviations ...................................................................................................1-3

1.4 ADS-B

Capabilities ...................................................................................................................1-4

1.5 TIS System Capabilities ............................................................................................................1-4

1.6 Interface Summary ....................................................................................................................1-5

1.7 General Specifications ...............................................................................................................1-6

1.8 Transponder Specifications .......................................................................................................1-8

1.9 UAT Receiver Specifications ....................................................................................................1-8

1.10 1090 MHz Receiver Specifications ...........................................................................................1-9

1.11 GPS Specifications ....................................................................................................................1-9

1.12 GPS Antenna Requirements ....................................................................................................1-10

1.13 Power Specifications ...............................................................................................................1-11

1.14 Certification .............................................................................................................................1-12

1.15 Operating Instructions .............................................................................................................1-17

1.16 License Requirements .............................................................................................................1-17

1.17 Reference Documents ..............................................................................................................1-17

2 L

IMITATIONS ......................................................................................................................................2-1

2.1 HSDB Packet Forwarding .........................................................................................................2-1

3 I

NSTALLATION OVERVIEW ................................................................................................................3-1

3.1 Introduction ...............................................................................................................................3-1

3.2 Unit Configurations ...................................................................................................................3-1

3.3 Accessories Supplied .................................................................................................................3-2

3.4 Optional Accessories .................................................................................................................3-4

3.5 Installation Materials Required But Not Supplied ....................................................................3-5

3.6 Installation Configurations ........................................................................................................3-6

3.7 Special Tools Required ..............................................................................................................3-6

3.8 Antenna Considerations .............................................................................................................3-7

3.9 Electrical Bonding .....................................................................................................................3-9

3.10 Cabling and Wiring .................................................................................................................3-10

3.11 Shielding and Electrical Bonding Considerations ...................................................................3-10

3.12 Cooling Requirements and Considerations .............................................................................3-10

3.13 Mounting Requirements ..........................................................................................................3-10

4 I

NSTALLATION PROCEDURE ..............................................................................................................4-1

4.1 Wiring Harness Installation .......................................................................................................4-1

4.2 Backshell Assemblies ................................................................................................................4-1

4.3 Coax Cable Installation .............................................................................................................4-1

4.4 Connector Backshell Assembly .................................................................................................4-1

4.5 Equipment Mounting - Panel Mount Units ...............................................................................4-1

4.6 Equipment Mounting - Remote Mount Units ............................................................................4-2

4.7 Antenna Installation ...................................................................................................................4-2

5 C

ONNECTOR PINOUT INFORMATION ................................................................................................5-1

5.1 Main Board Connector - P3251 .................................................................................................5-1

5.2 ADS-B Board Connector – P3252 ............................................................................................5-3

190-01499-02 GTX 3x5 TSO Installation Manual
Rev. 1 Page ii

TABLE OF CONTENTS CONTINUED

5.3 Power .........................................................................................................................................5-3

5.4 Lighting Bus ..............................................................................................................................5-4

5.5 Antennas ....................................................................................................................................5-4

5.6 Altitude Inputs ...........................................................................................................................5-5

5.7 Discrete IO .................................................................................................................................5-6

5.8 Serial Data Interfaces ................................................................................................................5-8

5.9 Suppression Bus ........................................................................................................................5-9

5.10 OAT Temperature Input ............................................................................................................5-9

5.11 Audio Output ...........................................................................................................................5-10

5.12 1PPS Interface .........................................................................................................................5-10

5.13 Configuration Module .............................................................................................................5-10

5.14 USB Interface ..........................................................................................................................5-11

6 P

OST INSTALLATION CONFIGURATION AND CHECKOUT ................................................................6-1

6.1 System Configuration Overview ...............................................................................................6-1

6.2 Mounting, Wiring, and Power Checks ......................................................................................6-1

6.3 Connector Engagement Check ..................................................................................................6-1

6.4 Configuration Setup ...................................................................................................................6-1

6.5 Remote Unit Configuration .......................................................................................................6-3

6.6 Diagnostic Information ..............................................................................................................6-3

6.7 Ground Checks ..........................................................................................................................6-3

6.8 Flight Checks .............................................................................................................................6-4

6.9 Database Check .........................................................................................................................6-4

6.10 Database Update Procedure .......................................................................................................6-4

6.11 Software Loading Procedure .....................................................................................................6-4

7 C

ONTINUED AIRWORTHINESS ........................................................................................................... 7-1

A

PPENDIX A MECHANICAL DRAWINGS .......................................................................................A-1

A.1 Drawing List................................................................................................................... A-1

A

PPENDIX B INTERCONNECT DRAWINGS ..............................................................................................B-1

190-01499-02 GTX 3x5 TSO Installation Manual
Rev. 1 Page iii

LIST OF FIGURES

Figure 3-1 Figure for Locations of Antennas........................................................................................3-9

Figure A-1 GTX 3x5 Panel Mount Assembly.......................................................................................A-2

Figure A-2 GTX 3x5 Panel Mount Dimensions and CG ......................................................................A-3

Figure A-3 GTX 3x5 Horizontal Remote Mount Assembly.................................................................A-4

Figure A-4 GTX 3x5 Horizontal Remote Mount Dimensions and CG ................................................ A-5

Figure A-5 GTX 3x5 Vertical Remote Mount Assembly .....................................................................A-6

Figure A-6 GTX 3x5 Vertical Remote Mount Dimensions and CG.....................................................A-7

Figure A-7 GTX 3x5 G1000 Mount Rack Assembly ...........................................................................A-8

Figure A-8 GTX 3x5 G1000 Mounting Rack Center of Gravity ..........................................................A-9

Figure B-1 GTX 345R G1000 Interconnect..........................................................................................B-2

190-01499-02 GTX 3x5 TSO Installation Manual
Rev. 1 Page iv

LIST OF TABLES

Table 1-1 GTX 3x5 Units........................................................................................................................1-1

Table 1-2 Interface Summary..................................................................................................................1-5

Table 1-3 Physical Characteristics - Panel Mount Units.........................................................................1-6

Table 1-4 Physical Characteristics - Remote Mount Units .....................................................................1-7

Table 1-5 Display Specifications.............................................................................................................1-8

Table 1-6 Transponder Specifications.....................................................................................................1-8

Table 1-7 UAT Receiver Specifications ..................................................................................................1-8

Table 1-8 1090 MHz Receiver Specifications.........................................................................................1-9

Table 1-9 GNSS Receiver Specifications................................................................................................1-9

Table 1-10 GNSS Receiver Antennas .....................................................................................................1-10

Table 1-11 Power Specifications.............................................................................................................1-11

Table 1-12 TSO/ETSO Compliance........................................................................................................1-12

Table 1-13 TSO and ETSO Descriptions ...............................................................................................1-13

Table 1-14 TSO/ETSO Deviations..........................................................................................................1-13

Table 1-15 Software Design Assurance Levels.......................................................................................1-16

Table 1-16 Complex Hardware Design Assurance Levels......................................................................1-16

Table 3-1 Accessories Supplied ..............................................................................................................3-2

Table 3-2 Recommended Crimp Tools....................................................................................................3-6

190-01499-02 GTX 3x5 TSO Installation Manual
Rev. 1 Page v

1 SYSTEM OVERVIEW

NOTE

1.1 Scope

Mechanical and electrical information for use in the planning and design of an installation of the GTX 3x5
into an aircraft is provided in this manual. This manual is not a substitute for an approved airframe-specific
maintenance manual, installation design drawing, or complete installation data package. Attempting to
install equipment by reference to this manual alone and without first planning or designing an installation
specific to your aircraft may compromise your safety and it is not recommended. The content of this
manual assumes use by competent and qualified avionics engineering personnel and/or avionics
installation specialist using standard maintenance practices in accordance with Title 14 of the Code of
Federal Regulation and other relevant accepted practices.

Garmin recommends installation of the GTX 3x5 by a Garmin–authorized installer. To the
extent allowable by law, Garmin will not be liable for damages resulting from improper or
negligent installation of the GTX 3x5. For questions, contact Garmin Aviation Product
Support at 1-888-606-5482.

1.2 Equipment Description

The GTX 3x5 is a family of ATCRBS and Mode S transponders, with some models including ADS-B in
capabilities and optional internal GPS/WAAS receivers. The following is a summary of the different units.

Table 1-1 GTX 3x5 Units

GTX

335R

w/

GPS

GTX

345

GTX 3

45 w/

GPS

GTX

345R

GTX 3

45R w/

GPS

Feature

ATCRBS X

GTX

325

GTX

335

GTX

335 w/

GPS

GTX

335R

Mode S X X X X X X X X

Panel Mount X X X X X

Remote X X X X

ADS-B out (1090) X X X X X X X X

ADS-B in
(UAT,1090)

Internal GPS X X X X

Bluetooth X X X X

X X X X

The GTX 325 is an ATCRBS transponder.

The GTX 335 is a Mode S transponder with ADS-B extended squitter capability.

The GTX 345 is a Mode S transponder with ADS-B extended squitter capability and also includes UAT
and 1090 receivers for ADS-B in capabilities.

The GTX 335 and GTX 345 units can be ordered with an internal GNSS receiver, used for the ADS-B
extended squitter output or as remote-mounted units. Remote mounted units do not have a front panel with
a display or keypad.

190-01499-02 GTX 3x5 TSO Installation Manual
Rev. 1 Page 1-1

The GTX 3x5 units, depending upon model, include the following functions.

• Mode S transponder (GTX 335 and GTX 345)

• ADS-B Out capability (GTX 335 and GTX 345)

• ADS-B In capability with built-in 1090 MHz and UAT receivers (GTX 345)

• Optional internal GNSS receiver (GTX 335 and GTX 345)

• Optional altitude encoder module

• Entry and display of squawk code and flight ID

• Display of pressure altitude, outside air temp, density altitude

• Flight timers

• Audio output

• Interface to Garmin display products such as the GTN and GNS series

• Bluetooth interface for display of weather and traffic on portable devices (GTX 345)

• Reception of TIS-A traffic (GTX 335)

190-01499-02 GTX 3x5 TSO Installation Manual
Rev. 1 Page 1-2

1.3 Definitions and Abbreviations

Definitions

Except where specifically noted, references made to GTX 3x5 will equally apply to all GTX 3x5 variants.

Abbreviations

The following abbreviations/acronyms are used within this document:

AC Advisory Circular
ADF Automatic Direction Finder
ADS-B Automatic Dependent Surveillance-Broadcast
ADS-R Automatic Dependent Surveillance-Rebroadcast
AFMS Aircraft Flight Manual Supplement
ATCRBS Air Traffic Control Radar Beacon System
CFR Code of Federal Regulations
CG Center of Gravity
CSA Conflict Situational Awareness
DC Direct Current
DME Distance Measuring Equipment
EQF Environmental Qualification Form
FAA Federal Aviation Administration
FCC Federal Communications Commission
FIS-B Flight Information Services-Broadcast
FMS Flight Manual Supplement
GNSS Global Navigation Satellite System
GPS Global Positioning System
HSDB High Speed Data Bus
LAT Latitude
LON Longitude
MFD Multifunction Display
POH Pilot Operating Handbook
RFMS Rotorcraft Flight Manual Supplement
SATCOM Satellite Communications
SBAS Satellite-Based Augmentation System
TAS Traffic Advisory System
TCAS Traffic Collision Avoidance System
TIS-B Traffic Information Service-Broadcast
TSO Technical Standing Order
UAT Universal Access Transceiver
UHF Ultra-High Frequency
USB Universal Serial Bus
VHF Very High Frequency
WAAS Wide Area Augmentation System

190-01499-02 GTX 3x5 TSO Installation Manual
Rev. 1 Page 1-3

1.4 ADS-B Capabilities

ADS-B technology is used to improve situational awareness and flight safety. With ADS-B capabilities,
position, velocity, and heading information are automatically transmitted to other aircraft and ground
stations. ADS-B provides automatic transmission of aircraft information without a request.

1.4.1 ADS-B Out

When properly installed with a GPS position source, meeting the guidance of AC 20-165 the GTX 335 and
GTX 345 include ADS-B Out capabilities. See section __ for additional information. The GTX 335 and
GTX 345 will broadcast the position, velocity, and heading information using the mode S transponder
transmitter.

1.4.2 ADS-B In

The GTX 345 includes 978 MHz UAT and 1090 MHz receivers for ADS-B In capabilities. The GTX 345
can receive airborne position from other aircraft with either the UAT or 1090 MHz receivers. The
GTX 345 can receive FIS-B information from ground stations.

1.4.3 Installation Approval for ADS-B Systems

Need information

1.5 TIS System Capabilities

The GTX 3x5 provides uplink information of nearby traffic from the TIS. TIS is a ground-based service
providing relative location of all transponder equipped aircraft within a specified service area. The TIS
ground sensor uses real time track reports to generate traffic notifications. TIS provides a graphical display
of traffic advisory information in the cockpit for non-TCAS equipped aircraft.

Advisory traffic information is available to aircraft equipped with a Mode S data link such as the Garmin
GTX 335 or GTX 345. Advisory traffic information may be displayed on a Garmin 400W/500W Series
unit.

The GTX 3x5 unit can be incorporated into installations with other compatible control/display units such
as the Garmin GNS 480 (CNX80), GTN 6XX/7XX, GMX 200, and MX20 MFD.

Surveillance data is provided for transponder equipped aircraft within the coverage volume. Aircraft
without an operating transponder are invisible to TIS. TIS displays traffic within seven nautical miles from
3000 feet below to 3500 feet above the requesting aircraft. The pilot sees the location, relative direction
and altitude of other aircraft.

190-01499-02 GTX 3x5 TSO Installation Manual
Rev. 1 Page 1-4

1.6 Interface Summary

The GTX 3x5 units include the following interfaces.

Table 1-2 Interface Summary

Interface Description I/O GTX 325 GTX 335 GTX 345

RS-232 I/O 3 3 4

ARINC 429

HSDB I/O 2

RS-422 I/O 1

Discrete I/O

Configurable as input or output

Gray code altitude input I 1 1 1

Suppression bus I/O 1 1 1

1PPS I/O 1 1 1

OAT input I 1 1 1

Audio output O 1 1 1

Configuration module, pressure sensor module
interface

USB interface I/O 1 1 1

Lighting bus input I 1 1 1

Switched power output O 1 1 1

O 1 1 1

I 2 2 2

I 6 6 6

O 1 1 1

I/O 2 2 4

I/O 1 1 1

190-01499-02 GTX 3x5 TSO Installation Manual
Rev. 1 Page 1-5

1.7 General Specifications

1.7.1 EQF

It is the responsibility of the installing agency to obtain the latest revision of the GTX 3x5 EQF. To obtain
a copy of the EQF, see Garmin’s Dealer Resource Center

Table 1-3 Physical Characteristics - Panel Mount Units

Characteristic Specification

Bezel height 1.65 inches (42 mm)

Bezel width 6.25 inches (159 mm)

Rack height (dimple to dimple) 1.68 inches (43 mm)

Rack width 6.30 inches (160 mm)

Depth behind panel with connectors (measured from face of aircraft
panel to rear of connector backshells)

GTX 325 weight (unit only) 2.01 lb (0.91 kg)

GTX 335 weight (unit only) 2.01 lb (0.91 kg)

GTX 335 with GPS weight (unit only) 2.12 lb (0.96 kg)

GTX 345 weight (unit only) 2.27 lb (1.01 kg)

GTX 345 with GPS weight (unit only) 2.38 lb (1.08 kg)

GTX 325 installed with rack and connectors 2.83 lb (1.28 kg)

GTX 335 installed with rack and connectors 2.83 lb (1.28 kg)

GTX 335 with GPS installed with rack and connectors 2.94 lb (1.33 kg)

GTX 345 installed with rack and connectors 3.09 lb (1.40 kg)

GTX 345 with GPS installed with rack and connectors 3.20 lb (1.45 kg)

Operating temperature range

Altitude range 55,000 feet

Humidity 95% non-condensing

Cooling External cooling not required

Audio output 100 mW into 500 Ω

.

10.07 inches (256 mm)

-4°F to 131°F (-20°C to + 55°C)

For more details refer to the

environmental qualification forms at
Garmin’s Dealer Resource Center
See appendix A for form part
numbers.

.

190-01499-02 GTX 3x5 TSO Installation Manual
Rev. 1 Page 1-6

Table 1-4 Physical Characteristics - Remote Mount Units

Characteristic Specification

Horizontal mount

Height 1.68 inches (43 mm)

Width 6.3 inches (160 mm)

Length (unit, mount, and connector backshells) 9.92 inches (224 mm)

Vertical mount

Height 6.55 inches (166 mm)

Width 1.4 inches (35 mm)

Length (unit, mount, and connector backshells) 12.1 inches (308 mm)

GTX 335R weight (unit only) 1.71 lb (0.78 kg)

GTX 335R weight (horizontal mount - mounting tray, connector
backplate, and connectors)

GTX 335R weight (vertical mount - mounting tray, connector
backplate, and connectors)

GTX 335R with GPS weight (unit only) 1.82 lb (0.83 kg)

GTX 335R with GPS weight (horizontal mount - mounting tray,
connector backplate, and connectors)

GTX 335R with GPS weight (vertical mount - mounting tray,
connector backplate, and connectors)

GTX 345R weight (unit only) 1.97 lb (0.89 kg)

GTX 345R weight (horizontal mount - mounting tray, connector
backplate, and connectors)

GTX 345R weight (vertical mount - mounting tray, connector
backplate, and connectors)

GTX 345R with GPS (unit only) 2.08 lb (0.94 kg)

GTX 345R with GPS (horizontal mount - mounting tray, connector
backplate, and connectors)

GTX 345R with GPS (vertical mount - mounting tray, connector
backplate, and connectors)

Operating temperature range

Altitude range 55,000 feet

Humidity 95% non-condensing

Cooling External cooling not required

Audio output 100 mW into 500 Ω

2.53 lb (1.15 kg)

2.73 lb (1.24 kg)

2.64 lb (1.20 kg)

2.84 lb (1.29 kg)

2.79 lb (1.27 kg)

2.99 lb (1.37 kg)

2.08 lb (0.94 kg)

3.10 lb (1.41 kg)

-4°F to 131°F (-20°C to + 55°C)

For more details refer to the

environmental qualification form at
Garmin’s Dealer Resource Center
See section section 1.7.1 for form
part number.

.

The GTX 3x5 display is a sunlight readable LCD display.

190-01499-02 GTX 3x5 TSO Installation Manual
Rev. 1 Page 1-7

Table 1-5 Display Specifications

Characteristic Specification

Display size

Active area

Resolution 200 x 33 pixels

Viewing angle

Width: 3.46 inches (88 mm)

Height: 0.843 inches (21.4 mm)

Width: 2.95 inches (74.98 mm)

Height: 0.486 inches (12.36 mm)

Left: 45°

Right: 45°

From top: 30°

From bottom: 10°

1.8 Transponder Specifications

Table 1-6 Transponder Specifications

Characteristic Specification

Transmitter frequency 1090 MHz ± 1 MHz

Transmitter power

Receiver frequency

Receiver sensitivity

Mode A capability

Mode C altitude capability

Mode S capability (GTX 335 and GTX 345)

Mode S altitude capability (GTX 335 and
GTX 345)

External suppression input

External suppression output ≥ 18 Vdc with 300ohm load, 35Vdc max with no load

125 W min at antenna, with max 2db cable loss

250 W nominal at unit

1030 MHz + ?? MHz

-74 dBm nominal for 90% replies

4096 identification codes

100 foot increments from -1000 to 62,700 feet

Selective identification codes, aircraft type

25 foot increments from -1000 to 50,175 feet with
suitable serial data altitude. 100 foot increments from

-1000 to 62,700 feet

≥ 10 Vdc to suppress

1.9 UAT Receiver Specifications

Table 1-7 UAT Receiver Specifications

Characteristic Specification

Frequency 978 MHz +

Modulation Continuous phase FSK, h = 0.6, raised cosine shaping, a = 0.5

Data rate 1.04 Mbps

Sensitivity -96 dBm for 90% MSR

190-01499-02 GTX 3x5 TSO Installation Manual
Rev. 1 Page 1-8

20 ppm

1.10 1090 MHz Receiver Specifications

Table 1-8 1090 MHz Receiver Specifications

Characteristic Specification

Frequency 1090 MHz +

Modulation Binary pulse-position

Data rate 1 Mbps

Sensitivity -82 dBm for 90% MSR

1 MHz

1.11 GPS Specifications

Table 1-9 GNSS Receiver Specifications

Characteristic Specification

Number of channels 15 (12 GPS and 3 GPS/SBAS receiver [1]

Frequency 1575.42 MHz L1, C/A code

Sensitivity (acquisition, no interference)

Sensitivity (drop lock) -144 dBm

Dynamic range >20 dB

LAT/LON position accuracy

Velocity 1000 knots maximum (above 60,000 ft)

TTFF (Time To First Fix)

Reacquisition 10 seconds typical

Position update interval 0.2 sec (5 Hz)

1PPS (Pulse Per Second) ± 275 nsec of UTC second

Datum WGS-84

SATCOM compatibility

Antenna power supply 35 mA typical, 40 mA max at 4.7 Vdc

-134.5 dBm GPS

-135.5 dBm SBAS

<1.25 meter RMS horizontal, <2 meter vertical, with
SBAS

1:45 min. typical with current almanac, position, and
time

SATCOM compatibility is dependent on antenna
selection

[1] GBAS correction and integrity data provided by an external VHF receiver.

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Rev. 1 Page 1-9

1.12 GPS Antenna Requirements

Antenna performance is critical to GNSS receiver operation. Antennas listed in table 1-10 meet
specifications outlined in Antenna Minimum Performance Specification for Garmin’s GPS/WAAS Receiver
System. To achieve acceptable performance with the GTX 335 or GTX 345 with internal GNSS receiver,
antennas listed table 1-10 must be used.

Table 1-10 GNSS Receiver Antennas

Model/Description

GA 35, GPS/WAAS TNC

GA 36, GPS/WAAS TNC

GA 37, GPS/WAAS/
XM

A33W, WAAS
Antenna

GPS/VHF Antenna TNC/BNC Comant CI-2580-200 N/A

GPS/VHF Antenna TNC/BNC Comant CI-2728-200 N/A

GPS/XM/VHF
Antenna

GPS/XM/VHF
Antenna

GPS/WAAS Antenna TNC Comant CI-428-200 N/A

GPS/XM Antenna TNC/TNC Comant CI-428-410 N/A

Connector

Type

TNC

TNC

TNC/TNC/BNC Comant CI-2580-410 N/A

TNC/TNC/BNC Comant CI-2728-410 N/A

Manufacturer P/N

Garmin 013-00235-( ) 013-00235-( )

Aero Antenna

Garmin 013-00244-( ) 013-00244-( )

Aero Antenna

Garmin 013-00245-( ) 013-00245-( )

Aero Antenna

Garmin 013-00261-( ) 013-00261-( )

Aero Antenna

AT575-93G( )-TNCF-000-RG-27­NM

AT575-126G( )-TNCF-000-RG-27­NM

AT2300-126G( )-TNCF-000-RG-27­NM

AT575-332G( )-TNCF-000-RG-27­NM

Garmin

Order

Number

[1] Same mounting hole pattern as GA 56, except GA 35 has a physically larger footprint.

[2] The GPS antenna connector is a TNC and the VHF connector is BNC.

[3] The GPS antenna connector is a TNC connector, the XM connector is TNC, and the VHF

connector is BNC.

190-01499-02 GTX 3x5 TSO Installation Manual
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1.13 Power Specifications

Table 1-11 Power Specifications

Unit Characteristic Specification

All units Input voltage 9 to 33 Vdc

14 Vdc 28 Vdc

GTX 325 Power input __ W typical, __ W max

Input current, typical

Input current, maximum

GTX 335 Power input 8 W typical, 15 W maximum

Input current, typical 0.57 A 0.29 A

Input current, maximum 0.86 A 0.43 A

GTX 335, GPS Power input 10 W typical, 17 W maximum

Input current, typical 0.72 A 0.36 A

Input current, maximum 1.22 A 0.61 A

GTX 345 Power input 10 W typical, 18 W maximum

Input current, typical 0.72 A 0.36 A

Input current, maximum 1.30 A 0.65 A

GTX 345, GPS Power input 12 W typical, 20 W maximum

Input current, typical 1.07 A 0.54 A

Input current, maximum 1.43 A 0.72 A

All units KEEP ALIVE input current

20 uA typical

40 uA maximum

65 uA typical

85 uA maximum

[1] Maximum input power and current is based upon maximum reply rates.

[2] Input power and current does not reflect the switched power output.

[3] KEEP ALIVE input only applies to the GTX 335 and GTX 345 with internal GNSS receiver.

190-01499-02 GTX 3x5 TSO Installation Manual
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1.14 Certification

The GTX 3x5 meets compliance with the claimed TSO(s) when interfaced with the equipment defined in
this manual, and installed in accordance with the requirements and limitations as defined.

The Appliance Project Identifier (API) for the GTX 3x5 is GMN-01216. The API is used for project
identification with the FAA and EASA. In addition, the alpha character appended to the end of the API in
the ETSO certificate is added to supplement project identification by EASA. This alpha character does not
represent a version number. To identify appliance approvals, see applicable hardware and software
numbers.

It is the installer’s responsibility to ensure the ADS-B Out system is compliant with AC 20-165 and to
ensure compatibility between the GTX 335 or GTX 345 and the ADS-B Out position source equipment.
For compatible equipment shown to be eligible for 14 CFR 91.227 compliant installations in accordance
with AC 20-165, see 14 CFR 91.227 ADS-B Out Compatible Equipment.

Table 1-12 TSO/ETSO Compliance

GTX

325

GTX

335

X TSO-C74d Class A

XXX

[1] With internal GPS.

[2] With optional pressure sensor module.

GTX

345

TSO-C88b
ETSO-C88a

XX

XX

X

TSO-C112e
ETSO-C112d

TSO-C145d

ETSO-C145c1

TSO-C154c

X

ETSO-C154c

TSO-C157a

X

ETSO-C157a

TSO-C166b
ETSO-C166b

TSO-C166b

X

ETSO-C166b

TSO-C195a

X

ETSO-C195a

TSO/ETSO

Class

Level

--

Class 1

Level 2es

Class B2

Class A1S

Class 1

Class B1S

Class A1S

Class C1,
C2, C3, C4

and

Software and CLD P/N Description

Software:

006-B____-00 through -0( )

006-B____-00 through -0( )

006-B____-00 through -0( )

CLDs:

006-C____-00 through -0( )

006-C____-00 through -0( )

Main

ADS-B In
GPS

Main

ADS-B In

190-01499-02 GTX 3x5 TSO Installation Manual
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Table 1-13 TSO and ETSO Descriptions

TSO/ETSO Description

TSO-C74d Air Traffic Control Radar Beacon System (ATCRBS) Airborne Equipment

TSO-C88b
ETSO-C88a

TSO-C112e
ETSO-C112d

TSO-C145d
ETSO-C145c

TSO-C154c
ETSO-C154c

TSO-C157a
ETSO-C157a

TSO-C166b
ETSO-C166b

TSO-C195a
ETSO-C195a

Automatic Pressure Altitude Reporting Code-Generating Equipment

Air Traffic Control Radar Beacon System / Mode Select (ATCRBS/Mode S)
Airborne Equipment

Airborne Navigation Sensors Using the Global Positioning System
Augmented by the Satellite Based Augmentation System

Universal Access Transceiver (UAT) Automatic Dependent Surveillance –
Broadcast (ADS-B) Equipment Operating on Frequency of 978 MHz

Aircraft Flight Information Services – Broadcast (FIS-B) Data Link System
and Equipment

Extended Squitter Automatic Dependent Surveillance – Broadcast (ADS-B)
and Traffic Information Service – Broadcast (TIS-B) Equipment Operating on
the Radio Frequency of 1090 Megahertz (MHz)

Avionics Supporting Automatic Dependent Surveillance – Broadcast
(ADS-B) Aircraft Surveillance Applications (ASA)

Table 1-14 TSO/ETSO Deviations

TSO/ETSO Deviation

1. Garmin requests a deviation from the mentioned TSOs to use RTCA DO-160G instead

TSO-C74d

TSO-C88b

TSO-C112e

of earlier versions of RTCA/DO-160 as the standard for Environmental Conditions and
Test Procedures for Airborne Equipment. ELOS is provided by use of later revision
requirement document. Refer to AC 21-16G for supporting guidance.

1. Garmin requests a deviation from the mentioned TSOs for marking the TSO number,
Type/Class and Date of Manufacture, Deviation and Software Part Number on the
exterior of the unit. Instead, Garmin requests to include product name, part number,
serial number, and this statement on the unit’s nameplate label “TSO-C112e See IM for
Add’l Appliance Apprvls.” The installation manual will contain all equipment approvals,
classes/types/ranges and TSO deviations as required by the TSOs, and the software
part numbers for the unit will be available through electronic query within the unit. ELOS
is provided because the installation manual will list all applicable information and the
article will permanently and legibly list the Primary TSO and state “See IM for Add’l
Appliance Apprvls.” All software part numbers can be verified through electronic query.
See Order 8150.1C Section 7-4e-4 and 8110.49 for further supporting statement of
policy.

1. Garmin requests a deviation from the mentioned TSOs for marking the TSO number,
Type/Class and Date of Manufacture, Deviation and Software Part Number on the
exterior of the unit. Instead, Garmin requests to include product name, part number,
serial number, and this statement on the unit’s nameplate label “TSO-C112e See IM for
Add’l Appliance Apprvls.” The installation manual will contain all equipment approvals,
classes/types/ranges and TSO deviations as required by the TSOs, and the software
part numbers for the unit will be available through electronic query within the unit. ELOS
is provided because the installation manual will list all applicable information and the
article will permanently and legibly list the Primary TSO and state “See IM for Add’l
Appliance Apprvls.” All Software part numbers can be verified through electronic query.
See Order 8150.1C Section 7-4e-4 and 8110.49 for further supporting statement of
policy.

190-01499-02 GTX 3x5 TSO Installation Manual
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