Garmin GTX 35R Installation guide

190-01499-10 October 2017 Revision 1

GTX 35R/45R Installation Manual

(Non-Certified Aircraft)

190-01499-10 GTX 35R/45R Installation Manual (Non-Certified Aircraft)

Rev. 1 Page A

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1 10/23/17 Initial Release

190-01499-10 GTX 35R/45R Installation Manual (Non-Certified Aircraft)

Rev. 1 Page i

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6.8 Amendments and Waivers. This Agreement may be amended and any provision of this

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Any translation of this Agreement from English is provided as a convenience

only. If this Agreement is translated into a language other than English and there is a

conflict of terms between the English version and the other language version, the English

version will control.

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TABLE OF CONTENTS

1 S

YSTEM OVERVIEW ........................................................................................................................1-1

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

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

1.3 Definitions and Abbreviations................................................................................................... 1-2

1.4 ADS-B Capabilities................................................................................................................... 1-4

1.5 FIS-B Capabilities ..................................................................................................................... 1-4

1.6 TIS-A System Capabilities........................................................................................................ 1-6

1.7 Interface Summary .................................................................................................................... 1-6

1.8 General Specifications............................................................................................................... 1-7

1.9 Transponder Specifications ....................................................................................................... 1-7

1.10 UAT Receiver Specifications (GTX 45R Only) ....................................................................... 1-8

1.11 1090 MHz Receiver Specifications........................................................................................... 1-8

1.12 Power Specifications ................................................................................................................. 1-8

1.13 Certification............................................................................................................................... 1-9

1.14 License Requirements ............................................................................................................. 1-10

1.15 Reference Documents.............................................................................................................. 1-11

2 L

IMITATIONS ...................................................................................................................................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 .................................................................................................................3-2

3.5 Necessary Installation Materials and Accessories Not Supplied .............................................. 3-3

3.6 Necessary Special Tools............................................................................................................ 3-3

3.7 Transponder Antenna ................................................................................................................ 3-4

3.8 Minimum Systems Configuration ............................................................................................. 3-5

3.9 GTX Pressure Altitude Input .....................................................................................................3-6

3.10 ADS-B In Considerations (GTX 45R Only) ............................................................................. 3-6

3.11 Bluetooth Considerations (GTX 45R Only).............................................................................. 3-6

3.12 Antenna Considerations ............................................................................................................ 3-7

3.13 Electrical Bonding..................................................................................................................... 3-8

3.14 Cabling and Wiring ................................................................................................................... 3-8

3.15 Electrical Bonding Considerations............................................................................................ 3-8

3.16 Cooling Requirements and Considerations ............................................................................... 3-8

4 I

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

4.1 Wire Harness Installation .......................................................................................................... 4-1

4.2 Backshell Assembly Parts ......................................................................................................... 4-2

4.3 Shielded Cable Preparation ....................................................................................................... 4-3

4.4 Connector and Backshell Assembly.......................................................................................... 4-5

4.5 Coaxial Cable Installation ......................................................................................................... 4-7

4.6 GAE Installation (optional)....................................................................................................... 4-8

4.7 Equipment Rack Installation ..................................................................................................... 4-9

4.8 Unit Installation and Removal................................................................................................. 4-10

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5 CONNECTOR PINOUT INFORMATION .............................................................................................5-1

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

5.2 ADS-B Board Connector – P3252 (GTX 45R Only)................................................................ 5-4

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

5.4 Altitude Inputs........................................................................................................................... 5-6

5.5 Discrete I/O ............................................................................................................................... 5-7

5.6 Serial Data Interfaces ................................................................................................................5-8

5.7 Suppression Bus ........................................................................................................................ 5-9

5.8 Garmin Altitude Encoder ........................................................................................................ 5-10

5.9 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 Configuration Mode and Settings.............................................................................................. 6-2

6.4 Unit Configuration and Software (Garmin Dealers Only) ........................................................ 6-3

6.5 Software Installation Procedure (Garmin Dealers Only) .......................................................... 6-5

7 C

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

A

PPENDIX A GTX X5 MECHANICAL DRAWINGS ..................................................................................A-1

A

PPENDIX B EQUIPMENT COMPATIBILITY AND CONFIGURATION .......................................................B-1

B.1 ADS-B In Displays (GTX 45R Only) ......................................................................................... B-1

B.2 GPS Sources ............................................................................................................................. B-2

A

PPENDIX C INTERCONNECT DRAWINGS ..............................................................................................C-1

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1 SYSTEM OVERVIEW

1.1 Scope

This manual is intended to provide mechanical and electrical information for use in the planning and

design of an installation of the GTX 35R/45R into an aircraft. 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 is not recommended.

1.2 Equipment Description

The GTX 35R/45R models include Mode S/ES transponders. These units are controlled through the GDU

displays in a G3X system.

Table 1-1 GTX 35R/45R Units

Feature

GTX 35R GTX 45R

Mode S/ES X X

ADS-B traffic in

(UAT and 1090 MHz)

X

Connext (via RS-232 and

Bluetooth)

X

FIS-B In X

TIS-A traffic X

Pressure sensor module

(optional)

X X

Interface to Garmin G3X X X

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1.3 Definitions and Abbreviations

Definitions

References made to GTX 35R/45R apply to all GTX 35R/45R models, except when noted.

The term squitter refers to a burst or broadcast of aircraft-tracking data that is periodically transmitted by a

Mode S transponder without radar interrogation. The GTX 35R/45R Mode S/ES models transmit

ADS-B Out ES. These transmissions contain additional aircraft information that includes GPS based

location information.

Abbreviations

These abbreviations and acronyms are used in 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

AIRMET Airmen Meteorological Information

API Appliance Project Identifier

CDTI Cockpit Display of Traffic Information

ATCRBS Air Traffic Control Radar Beacon System

CFR Code of Federal Regulations

CG Center of Gravity

CONUS Continental United States

CSA Conflict Situational Awareness

DC Direct Current

DME Distance Measuring Equipment

EQF Environmental Qualification Form

ES Extended Squitter

FAA Federal Aviation Administration

FCC Federal Communications Commission

FCU Flight Control Unit

FIS-B Flight Information Services-Broadcast

FMS Flight Manual Supplement

GAE Garmin Altitude Encoder

GNSS Global Navigation Satellite System

GPS Global Positioning System

GTX Garmin Transponder

HSDB High Speed Data Bus

LAT Latitude

LON Longitude

MCP Mode Control Panel

METAR Meteorological Aviation Report

MFD Multifunction Display

MSR Message Success Rate

NOTAM Notice to Airmen

NEXRAD Next Generation Radar

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PED Portable Electronic Device

PIREP Pilot Weather Report

POH Pilot Operating Handbook

RAIM Receiver Autonomous Integrity Monitoring

RFMS Rotorcraft Flight Manual Supplement

SATCOM Satellite Communications

SBAS Satellite-Based Augmentation System

SIGMET Significant Meteorological Information

SIL Source Integrity Level

SPI Special Position Indicator

SUA Special Use Airspace

TAF Terminal Area Forecast

TAS Traffic Advisory System

TCAS Traffic Collision Avoidance System

TIS Traffic Information Service

TIS-B Traffic Information Service-Broadcast

TSO Technical Standard Order

UAT Universal Access Transceiver

UHF Ultra-High Frequency

USB Universal Serial Bus

VHF Very High Frequency

VSWR Voltage Standing Wave Ratio

WAAS Wide Area Augmentation System

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1.4 ADS-B Capabilities

1.4.1 ADS-B Out

The GTX 35R/45R include ADS-B Out capabilities when installed with GPS position source that meets

the TSO performance requirements specified in 14 CFR 91.227

1.4.1.1 Garmin Altitude Encoder

In most installations, the GTX 35R/45R receives pressure altitude data from the G3X system. An optional

GAE sensor module is available for installations requiring pressure altitude data that meets the

requirements of TSO-C88b. The sensor module connects to the aircraft static system. The module attaches

to the rear connector plate with two screws, and has short, unshielded wires to connect to the GTX 35R/

45R unit through the rear D-sub connector.

NOTE

The GAE sensor does not need to be disconnected if the GTX 35R/45R is removed from the

mounting rack.

1.4.2 ADS-B In

The GTX 45R includes receivers for both the UAT and the 1090 MHz frequency bands for all ADS-B In

data reception capabilities. The GTX 45R receives ADS-B transmissions from other ADS-B Out equipped

aircraft, ADS-R, and TIS-B information from ground stations. The GTX 45R supplies ADS-B data to G3X

Touch displays, certain Garmin panel-mount navigators, and certain portable devices via Bluetooth.

1.4.3 Installation Approval for ADS-B Systems

The conditions and tests necessary for TSO approval of the GTX 35R/45R are minimum performance

standards. It is the responsibility of the installer to determine if the aircraft installation conditions are

within the TSO standards.

All GTX 35R/45R unit functions are design-approved under the TSO. Changes or modifications to any

unit that are not approved can void the compliance to necessary regulations and authorization for continued

equipment usage.

It is the installer’s responsibility to make sure the ADS-B Out system installation is compliant with

14 CFR 91.227.

1.5 FIS-B Capabilities

FIS-B information is for pilot-planning and pilot near-term decisions. The information shown are areas of

inclement weather that are out of visual range or are not easily seen.

The GTX 45R receives FIS-B information from UAT ground stations in the United States. A direct line-of-

sight between the ground station and aircraft is necessary to receive FIS-B data. The GTX 45R supplies

FIS-B data to G3X Touch displays, certain Garmin panel-mount navigators, and certain portable devices

via Bluetooth. Supported FIS-B data includes:

• NOTAM (includes TFRs)

•AIRMET

•SIGMET

•SUA

•METAR

•TAFs

•PIREP

• Winds/Temps Aloft

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• Regional NEXRAD

• CONUS NEXRAD

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1.6 TIS-A System Capabilities

The GTX 35R supplies information about nearby traffic through the FAA provided radar based TIS-A

service. Advisory traffic information is shown on G3X/G3X Touch displays, and compatible Garmin

panel-mount navigators.

1.7 Interface Summary

Table 1-2 Interface Summary

Interface Description Input/Output

GTX 35R

Qty

GTX 45R

Qty

RS-232 I/O 3 4

ARINC 429

O 1 1

I 2 2

HSDB I/O N/A 2

RS-422 I or O N/A 1

Suppression bus I/O 1 1

1PPS O 1 1

GAE module interface I/O 1 1

USB interface I/O 1 1

190-01499-10 GTX 35R/45R Installation Manual (Non-Certified Aircraft)

Rev. 1 Page 1-7

1.8 General Specifications

Table 1-3 Physical Characteristics

1.9 Transponder Specifications

Table 1-4 Transponder Specifications

Characteristic Specification

Height, standard mount 1.7 inches (43 mm)

Width, standard mount 6.3 inches (160 mm)

Length, standard mount (unit, mount, and connector backshells) 9.9 inches (252 mm)

GTX 35R weight (unit only) 1.7 lb (0.77 kg)

GTX 45R weight (unit only) 2.0 lb (0.91 kg)

GTX 35R weight with standard mounting tray, backplate, and

connectors

2.5 lb (1.13 kg)

GTX 45R weight with standard mounting tray, backplate, and

connectors

2.9 lb (1.32 kg)

Operating temperature range

-40°F to 158°F (-40°C to + 70°C)

For more details refer to the EQF.

Maximum operating altitude 55,000 feet

Humidity 95% non-condensing

Cooling External cooling not necessary

Characteristic Specification

Transmitter frequency 1090 MHz ± 1 MHz

Transmitter power

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

250 W nominal at unit

Receiver frequency

1030 MHz + 0.01 MHz

Receiver sensitivity

-74 dBm nominal for 90% replies

External suppression input

≥ 10 VDC to suppress

External suppression output

≥ 18 VDC with 300 ohm load, 28 VDC typical with no

load

190-01499-10 GTX 35R/45R Installation Manual (Non-Certified Aircraft)

Rev. 1 Page 1-8

1.10 UAT Receiver Specifications (GTX 45R Only)

Table 1-5 UAT Receiver Specifications

1.11 1090 MHz Receiver Specifications

Table 1-6 1090 MHz Receiver Specifications

1.12 Power Specifications

GTX 35R/45R units require an input voltage of between 9 VDC and 33 VDC. The maximum input power

and current is based upon maximum reply rates.

Table 1-7 Power Specifications

Characteristic Specification

Frequency 978 MHz +

20 ppm

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

Data rate 1.04 Mbps

Sensitivity -96 dBm for 90% MSR

Characteristic Specification

Frequency 1090 MHz +

1 MHz

Modulation Binary pulse-position

Data rate 1 Mbps

Sensitivity -81 dBm for 90% MSR

Unit Characteristic

Specification

14 VDC 28 VDC

GTX 35R

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 45R

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

190-01499-10 GTX 35R/45R Installation Manual (Non-Certified Aircraft)

Rev. 1 Page 1-9

1.13 Certification

The GTX 35R/45R meets compliance with the TSO(s) when interfaced with equipment and installed in

accordance with the requirements and limitations as outlined in this manual.

FIS-B information, including weather information, NOTAMs, and TFR areas, are intended to assist in

long- and near-term planning decision making. The system lacks sufficient resolution and updating

capability necessary for aerial maneuvering associated with immediate decisions.

The Appliance Project Identifier (API) for the GTX 35R/45R is GMN-01216. The API is used for project

identification with the FAA. Refer to applicable hardware and software part numbers to identify appliance

approvals.

Refer to the GTX 35R/45R Transponder TSO Installation Manual (190-01499-04) for TSO compliance

information (including applicable part numbers, deviations, and non-TSO functions).

1.13.1 Design Assurance Levels

Table 1-8 Software Design Assurance Levels

Table 1-9 Complex Hardware Design Assurance Levels

System Function

DO-178B

Level

Mode S transponder functionality C

Display of TIS-A traffic data C

Flight information data (FIS-B, including weather information) processing and output

to display

D

1090 ADS-B transmission C

1090/UAT ADS-B reception B

Correlation of TCAS traffic with ADS-B, ADS-R, and TIS-B traffic B

Conflict Situational Awareness (CSA) including visual and aural alerts B

External UAT ADS-B control C

Pressure sensor module C

Flight ID C

Bluetooth output E

HSDB packet forwarding B

Data concentrator C

Function DO-254

Main board, transponder, and I/O C

ADS-B board, 978 MHz and 1090 MHz receivers C

190-01499-10 GTX 35R/45R Installation Manual (Non-Certified Aircraft)

Rev. 1 Page 1-10

1.13.2 Transmitter Grant of Equipment Authorization

Table 1-10 Equipment Authorization

1.14 License Requirements

CAUTION

The UHF transmitter in this equipment is guaranteed to meet Federal Communications

Commission acceptance over the operating temperature range. Modifications not

expressly approved by Garmin could invalidate the license and make it unlawful to

operate the equipment.

NOTE

For non-US installations consult the local spectrum management agency for

requirements.

The Telecommunications Act of 1996, effective February 8, 1996, provides the FCC discretion to

eliminate radio station license requirements for aircraft and ships. The GTX 35R/45R installation must

obey current transmitter licensing requirements. In the US, to find out the specific details on whether a

particular installation is exempt from licensing, visit the FCC website http://wireless.fcc.gov/aviation.

If an aircraft license is necessary, apply for a license on FCC Form 404, Application for Aircraft Radio

Station License. The FCC also has a fax-on-demand service to supply forms by fax. The GTX 35R/45R

owner accepts all responsibility for obtaining the proper licensing before using the transponder.

Model FCC ID

GTX 35R IPH-02133

GTX 45R IPH-02256

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